Answer:
The correct answer is option c. "the tend-and-befriend response".
Explanation:
The tend-and-befriend response is a natural behavior that function as a response to stress. It refers to look for the protection of the offspring and ask for help in the social group at which she or he belongs. The tend-and-befriend response is more common among women than men, because the primary response of men when dealing with a stressful situation is to fight-or-flight.
Which of the following is the correct sequence of events for muscle contractions?a) motor neuron action potential, meurotransmitter release, muscle cell action potential, release of calcium ions from SR, AtP-driven power stroke, sliding of myofilamentsb) neurotransmitter release, muscle cell action potential, motor reuron action potential, release of calcium ions from SR, sliding of myofilaments, ATP-driven power strokec) muslce cell action potential, neurotransmitter release, atp-driven power stroke, calcium ion release from SR, sliding of myofilamentsd) neurotransmitter rlease, motor neuron cation potential, muscle cell action potential, release of calcium ions from SR, ATP-driven power stroke
The answer is; A
When an impulse from the motor neuron reached the neuromuscular junction, the voltage-dependent calcium channels are activated and the neurotransmitter released from the presynaptic cleft. When the neurotransmitter binds to their receptors on the sarcolemma, the muscle fibers become depolarised; the calcium is released from their vesicles. The Ca2+ ions are important in the power stroke because they bind to troponin. Upon binding calcium, troponin moves tropomyosin away from the myosin-binding sites on actin. Powered by the energy from ATP molecule, the myosin is able to bind on the actin and slides over the actin filament.
Bats eat insects that damage crops and mosquitoes that are vectors for disease. One million bats can eat several tons of insects per night, saving billions of dollars in pesticides yearly. Agricultural and public health scientists are concerned about the spread of white-nose syndrome (WNS). WNS is a result of a fungus that can infect cave-dwelling bats. While bats hibernate during winter months, the fungus covers the bats’ face and wings. WNS has a near 100% mortality rate, and 5.7 million bats have died since the discovery of the fungus in 2006. Many scientists are searching for ways to protect these bats. The relationship between this fungus and bats can best be defined as
The answer is; parasitism
In this type of relationship, one organism benefits while the other is harmed. Parasitism differs from predation in that the parasite is often smaller than the host and reproduces at a higher rate. It also does not kill its host directly but by reducing its fitness.
Answer:
Parasitic, because the fungus obtains nutrients and shelter from the bats
Explanation:
Hope this helps
Which of the following is an example of an abiotic factor?
A) The algal levels in the epipelagic zone
B) The temperature of water at the seafloor
C) The shrimp population in a bay
D) The growth rate of a seagrass bed
The correct answer is B
Hope this helps
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The example of an abiotic factor from the list provided is B) The temperature of water at the seafloor. Temperature is a non-living, physical characteristic that influences marine life and ecosystems, distinguishing it from biotic factors such as algal levels and populations of shrimp and seagrass.
Explanation:The student's question asks to identify an example of an abiotic factor. Abiotic factors are the non-living, physical and chemical components of an ecosystem that affect the organisms and the functioning of the ecosystem. Examples of abiotic factors include temperature, light, salinity, and flow regime among others.
From the given options, the correct answer is B) The temperature of water at the seafloor. Temperature is an abiotic factor because it is a physical characteristic of the environment, not a living component. This is contrasted with the algal levels and the populations of shrimp and seagrass which are living, or biotic factors.
It is important to note that abiotic factors like salinity and temperature are crucial for sustaining life in marine biomes. They influence the physical properties of water, which in turn affect various biological processes, biodiversity, and the distribution of marine organisms.
Which of these organisms would seem to be most closely related? a) Canis familiaris b) Canis lupus c) Panthera pardus d) Mephitis mephitis
well A.) is a dog B.) is a wolf C.) is a leopard and D.) is a skunk
option d is the most related to its self
Volcanologists are scientists who study volcanic eruptions. However, most volcanologists rarely get to witness a volcanic eruptions actually occurring. Instead, many volcanologists use models to study volcanic eruptions. What is the most likely reason why volcanologists often rely on models to study volcanic eruptions?
Answer:Volcanic eruptions are very dangerous events.
Explanation:Models represent objects, events, and processes in the real world.
Models are often used when an object, event, or process
occurs too slowly or too quickly;
is too small or too large;
is too complicated or too dangerous.
Volcanic eruptions produce both molten lava and poisonous gases. Therefore, eruptions can be very dangerous. Many volcanologists have lost their lives while observing volcanic eruptions.
Answer:
Volcanic eruptions are very dangerous events
Explanation:
Study island
Identify the statement that is true.
A.Passive transport does not require the cell to use energy, while active transport does. An example of passive transport is a the sodium-potassium pump.
B.Passive transport requires the cell to use energy, while active transport does not. An example of passive transport is a carrier protein involved in facilitated diffusion.
C.Passive transport does not require the cell to use energy, while active transport does. .An example of passive transport is a carrier protein involved in facilitated diffusion.
D.Passive transport requires the cell to use energy, while active transport does not. An example of passive transport is a the sodium-potassium pump.
the best answer u got here is C. Passive transportdoes not require the cell to use energy, while active transport does. An example of passive transport is a carrier protein involed in facilitated difussion.
this the best answer u got here and i reccomend this one plz mark brainliest
Final answer:
The accurate statement is C: Passive transport does not require energy, while active transport does. Facilitated diffusion with carrier proteins is a form of passive transport, whereas the sodium-potassium pump exemplifies active transport.
Explanation:
The statement that is true is: Passive transport does not require the cell to use energy, while active transport does. An example of passive transport is a carrier protein involved in facilitated diffusion. Therefore, the correct answer is C. Passive transport includes processes such as diffusion, where molecules move from an area of high concentration to an area of low concentration, and facilitated diffusion, which involves carrier or channel proteins but does not require energy.
Active transport, on the other hand, requires energy in the form of ATP because it moves substances against their concentration gradient. A prime example of active transport is the sodium-potassium pump, which exchanges sodium ions for potassium ions across the plasma membrane of animal cells, requiring energy to function.
What gas made up the largest portion of earth's atmosphere for most of earth's history
Gases in Earth's Atmosphere. Nitrogen and Oxygen are by far the most common. Dry air is composed of about 78% Nitrogen (N2) and about 21% Oxygen (O2). Argon, Carbon Dioxide (CO2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases.
So therefore Oxygen is the gas that makes up the largest portion of the Earths Atmosphere.
The gas that made up the largest portion of Earth's atmosphere for most of Earth's history was hydrogen. Hydrogen was the most abundant gas in the solar nebula from which the Earth formed, and it made up about 90% of the Earth's atmosphere for the first few hundred million years of its history.
However, over time, hydrogen escaped from the Earth's atmosphere and was replaced by other gases, such as nitrogen and oxygen.
Today, nitrogen is the most abundant gas in Earth's atmosphere, making up about 78% of the atmosphere. Oxygen is the second most abundant gas, making up about 21% of the atmosphere. Hydrogen is only a very small fraction of the atmosphere today, making up about 0.00005% of the atmosphere.
The change in the composition of Earth's atmosphere over time is due to a number of factors, including the escape of gases from the atmosphere, the formation of new gases, and the interaction of gases with the Earth's surface.
The escape of hydrogen from the atmosphere is thought to have been caused by the high temperature of the Earth's early atmosphere. The formation of new gases, such as nitrogen and oxygen, is thought to have been caused by the interaction of solar radiation with the Earth's atmosphere.
The interaction of gases with the Earth's surface is thought to have been caused by the weathering of rocks and the formation of oceans.
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Which of the following organisms would you expect to have the largest surface-area-to-volume ratio? Assume that all of the following are the same total length.
A) a mollusk
B) an annelid
C) an arthropod
D) a platyhelminth
The correct answer is: D) a platyhelminth
A platyhelminth is a simple unsegmented soft-bodied flat worm with bilateral symmetry.
Since they don’t have any respiratory and circulatory organs, respiration occurs through the whole surface of the body. So, this type of worm has a great surface area in order to absorb more oxygen.
What is the primary function of a statolith?
a structure in the statocyst
Give an example of how a mutation can affect an organism.
Don’t know if this will help at all but,
Down syndrome is caused by a genetic mutation. This mutation also causes flat feet.
They could become immune to a certain disease or for a animal such as a rabbit they could mutate and end up with white fur which could help them adapt in an area with snow.
Which type of joint do you think allows for the greatest number of different movements? Explain your reasoning. What factors influence range of motion of a joint? Explain how a person can improve flexibility at the joints. Your goniometer breaks. Describe another way you might be able to measure range of motion. You may use any other materials. Your favorite team is winning the championship game. You drop to one knee, tip your head back, raise one hand over your head, clench your fist and yell, “Yes.” Use the proper terms to describe the movements undertaken by your joints. You overhear two men at the gym talking about their extensor muscles of the forearm. Based on what you know about the motion at joints, how would you describe the movement of these muscles?
Answer:
what kind of weed joint do fish love to smoke
Explanation: they love sea weed
The location of continents has no affect on their climate.
Please select the best answer from the choices provided
T
F
The answer is False. The location of the continents has a great effect on their climate. Because of their distance from the equator which is the closest point to the sun.
Answer:
False
Explanation:
The location of continents affects on their climate. The continents present near any water body have maritime climate. They have a moderate climate with almost constant temperature all over the year and no or less seasonal variations. On the other hand, the continents that do not have any water bodies in vicinity exhibit continental climate with a huge seasonal and daily temperature variations.
How does cytolysis occur via the complement pathway?Stimulation of the inflammatory responseFormation of the MAC in invading cells, killing themDisrupting cell wall of pathogensTriggering the release of histamine
Cytolysis occurs via the complement pathway when the immune system forms a MAC (Membrane Attack Complex) in the invading cell, leading to its disruption and death. It also stimulates the inflammatory response and releases histamines to enhance immune activity.
Explanation:Cytolysis, the process of cell destruction – often of invading pathogens -, can occur via the complement pathway, a part of the immune response. When pathogens invade the body, the immune system proteins respond to signal the presence of the foreign invaders. These signals stimulate the formation of the MAC (Membrane Attack Complex) in invading cells. The MAC drills a hole in the wall of the foreign cell, leading to its disruption and eventual death – this is the primary mode of cytolysis via the complement pathway.
In addition, the complement pathway also stimulates the inflammatory response, to help rid the body of pathogens. During this response histamines are released, causing blood vessels to expand and increase blood flow to the site of infection, facilitating the arrival of more immune cells. So, in broad terms, the complement pathway contributes to cytolysis by disrupting the cell wall of pathogens, aiding in their destruction.
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Cytolysis occurs via the complement pathway when a C3 protein splits into two fragments. One of these fragments, C3b, triggers the formation of a Membrane Attack Complex (MAC) that disrupts the pathogen's osmotic balance, causing the pathogen cell to burst and die.
Explanation:Cytolysis, or the bursting and killing of a cell, occurs via the complement pathway in several steps. The key point in both classical and alternate pathways is the splitting of the C3 protein. In the alternate pathway, C3 is spontaneously activated and leads to further reactions involving factor P, factor B, and factor D. This results in two fragments: C3b, which binds to the surface of the pathogen, and C3a, which attracts phagocytes to the infection site. Consequently, surface-bound C3b triggers the rest of the cascade involving proteins C5-C9, creating the Membrane Attack Complex (MAC). The MAC disrupts the pathogen's osmotic balance, effectively killing it. The classical pathway is similar, but early activation requires the presence of an antibody bound to an antigen, making it dependent on the adaptive immune response.
The earlier fragments of the C3 protein also serve important functions, attracting phagocytic cells to the infection site. Some phagocytic cells, such as macrophages and neutrophils, once arrived, their receptors for surface-bound C3b allow them to recognize and destroy the pathogen more easily. Thus, cytolysis helps to protect the body from invading pathogens.
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You live in a city in Florida on the Gulf of Mexico and are trying to figure out why the water at the beaches turned bright green for several months during the summer. You discover the green comes from a photosynthetic organism that grew at great numbers due to fertilizer spill in a nearby river. You have isolated the organism and are now testing its DNA. You extract all the DNA from your sample and find that there are three distinct kinds of DNA. Which of the following organisms could have been responsible for the bloom: fungus, bacteria, or protist? How do you know?
The organism responsible for the bright green water at beaches is most likely a protist, indicated by the presence of three distinct kinds of DNA in the sample, which is typical for protists.
Explanation:Based on the information provided, the green water at the beaches likely indicates a photosynthetic algal bloom. The presence of three distinct kinds of DNA in the isolated sample suggests that the organism responsible for the bloom is likely a protist. This inference is made because different types of DNA correspond to different components within protist cells, such as nuclear DNA, mitochondrial DNA, and in some cases, chloroplast DNA. Such a DNA organization is not typical of fungi or bacteria. Fungi are heterotrophic and would not be expected to have a photosynthetic pigment, while bacteria would typically have a single circular chromosome and not three separate kinds of DNA. Protists, particularly algae, are known for photosynthetic capability and have been linked to massive blooms in aquatic environments due to nutrient runoff, such as a fertilizer spill.
The organism responsible for the green bloom in the Gulf of Mexico beaches is most likely a protist. The presence of three distinct kinds of DNA indicates genetic variability within the organism, which is characteristic of many protists. Protists are eukaryotic microorganisms that can perform photosynthesis and are known to cause algal blooms when conditions are favorable, such as an increase in nutrients from a fertilizer spill in the nearby river.
The organism responsible for the green bloom is likely a protist, as they include photosynthetic algae, unlike fungi or bacteria.
Based on the information provided, the organism responsible for the green bloom is likely a protist. Protists are a diverse group of eukaryotic microorganisms that can be unicellular, colonial, or multicellular. They include various types of algae, some of which are photosynthetic and can cause algal blooms when conditions are favorable, such as excess nutrients in the water.
Fungi and bacteria are not typically photosynthetic organisms. While some bacteria and fungi may thrive in environments with excess nutrients, they are unlikely to cause the bright green coloration observed in the water.
Therefore, based on the photosynthetic nature of the organism responsible for the bloom, it is most likely a protist.
Which of the following is a correct statement about sugar movement in phloem?
Sugar transport does not require energy.
Sugar is translocated from sinks to sources.
Movement can occur both upward and downward in the plant.
Diffusion can account for the observed rates of transport.
Only xylem cells can perform sugar movement
The correct answer is: Movement can occur both upward and downward in the plant.
Phloem is a plant tissue (in vascular plants) that transports the organic compounds made during photosynthesis in the form of sap-water based solution rich in sugars. Phloem is composed of living cells generally called sieve elements. Transport of sap is multidirectional: sometimes sugars made in photosynthesis are transported to non-photosynthetic parts of the plant, such as the roots but sometimes roots are sugar sources so the sap needs to be transported upward for the plant’s growth.
Final answer:
Movement can occur both upward and downward in the plant, as sugars are actively loaded into the phloem and move from sources to sinks, with the process requiring energy for active transport.
Explanation:
The correct statement about sugar movement in phloem is: Movement can occur both upward and downward in the plant. Sugars, primarily sucrose, are actively loaded into the phloem at source areas, like photosynthesizing leaves, where they are produced. This loading decreases the water potential inside the phloem, causing water to move by osmosis from the adjacent xylem into the phloem tubes, increasing pressure. Such pressure facilitates the flow or bulk flow of the phloem sap from source to sink areas, where sugars are needed or stored, such as growing roots or fruits.
At the sink, sucrose is unloaded by either diffusion or active transport, depending on the concentration gradient and the cellular requirements. The water then moves out of the phloem, again by osmosis, and can be cycled back into the plant via the xylem. It's important to note that sugar transport in the phloem does require energy for the active transport of sucrose into the phloem, contrary to the idea that it does not require energy.
A young woman recovering from a blow to her head finds she has great difficulty maintaining her balance and coordinating her movements. injury to which part of her brain is likely to be causing her difficulties? cerebral cortex medulla thalamus pons cerebellum
the most likely is the cerebal cortex.
Answer:
Cerebellum
Explanation:
The cerebellum is the part of the brain present posterior to medulla and pons. Its main function is to coordinate the contractions of skeletal muscles during movements to ensure smooth and skilled movements. It sends signals to motor areas of the cerebral cortex to ensure the coordinated muscular activities during several body movements.
Cerebellum also helps maintain the posture and balance of the body. Any injury to the cerebellum makes the individuals unable to maintain the correct posture and to perform coordinated skeletal muscle movement.
What are the tough and flexible connective tissues seen in embryos?
periosteum
Haversian canals
vessels
cartilage
In what stage were most of the onion root tip cells? based on what you know about cell cycle division, what does this imply about the life span of a cell?
The correct answer is interphase.
Root tip cells are known cells that have a rapid division to allow the growth and lengthening of the roots
The life of the somatic cell is divided into two major phases: interphase and mitosis.
The interphase is the longest phase in a eukaryotic cell, it is in this phase that the cell must prepare for division, and this by transcribing necessary proteins, replicate and repair the DNA in case of lesions. .
Mitosis is relatively fast, it represents less than a quarter of the life of the cell.
Answer:
The correct answer is interphase.
Explanation:
Interphase is the cell cycle stage in which most of the onion root tip cells are present. Interphase is the longest part of the cell cycle as the cell grows and develops here.
It takes place before mitosis and the majority of the development takes place in this stage. The stage comprises all the three G1, G2 and S phase. Thus, it can be said that the cells go through the process of development before it actually begins to proliferate. This shows that the cells in the onion root tips generally spend the majority of their lifespan in the interphase stage.
Based on information in the lesson, which of the following foods is most likely to be imported?
A.) lettuce
B.) almonds
C.) shrimp
D.) strawberries
Answer:
The answer would definitely be C.) Shrimp
Explanation:
In the United States, the FDA estimates that one-third of our fruit and nuts and one-eighth of our vegetables come from other countries. Only about 10 percent of our meat is imported. Imports of meat come mostly from Canada, Australia, and New Zealand. About 80 percent of our fish and shellfish is imported. These imports come mostly from China, Thailand, and Canada.
On the basis of the lesson, the food that is most likely to be imported is known as shrimp. Thus, the correct option for this question is C.
What is Food import?Food import may be defined as the process that involves the movement of food and its derivative products into the Europian union from countries outside the EU. It also explains the migration of food from other countries to their own country.
When we talk about the United States, it is estimated that approximately 35% of fruits and nuts and 15% of vegetables approaches from other countries of the world.
Apart from this, about 80-85% of the fish and shellfish are also imported from different countries like China, Canada, Russia, Thailand, etc.
Therefore, the food that is most likely to be imported is known as shrimp. Thus, the correct option for this question is C.
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Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal? A) a disproportionate production of T3 to T4 B) hyposecretion of TSH C) hypersecretion of TSH D) hypersecretion of MSH E) a decrease in the thyroid secretion of calcitonin
The correct answer: B) hyposecretion of TSH
Hypothyroidism is a disorder of the endocrine system when the thyroid gland does not work properly, meaning that the production of thyroid hormone is decreased. This disorder is manifested by poor ability to tolerate cold, tiredness, constipation, depression, and weight gain. The causes of hypothyroidism are:
• Low iodine in diet
• autoimmune condition Hashimoto's thyroiditis
• treatment with radioactive iodine
• injury (or surgery) that affects hypothalamus or the anterior pituitary gland
• medications..
The diagnosis of hypothyroidism includes blood tests measurements of thyroid-stimulating hormone (TSH) and thyroxine levels.
What does the presence of homologous structures in different organisms suggest?
common distribution
common ancestry
similar habitat
similar movement
The answer is “common ancestry”
Answer:
The correct answer is option 2. Common ancestry.
Explanation:
The homologous structure is the structure that has a similar anatomical structure or underlying skeleton and can perform a different function in different organisms.
Homologous structures are similar in different organisms because they diverge from a common ancestor. All organisms that have homologous structures are considered to have a common ancestry. for example, human arm, dogs forearm, bat's wing all have a similar skeleton structure
Thus, the correct answer is option 2. Common ancestry.
which two of the following cannot be dated using the carbon 14 dating method? Choose two from paper, pollen, leather, coal, bones, hair, egg shells, carboniferous limestone, wood, rope
Answer:
carboniferous limestone and rope
Explanation:
Scientists use carbon dating to determine the age of biological artifacts up to 50,000 years old, however not all materials can be dated with the carbon 14 method. Most, if not all, organic compounds can be dated.
The major function of the _[blank]_ is to filter waste out of the blood.
kidney
small intestine
bladder
lung
Answer:
Kidney
Explanation:
What is the predominant nitrogen-containing pollutant in the atmosphere?
the predominant pollutants include nitrogen oxides, particularly nitric oxide (NO) and nitrogen dioxide (NO2), and volatile organic compounds.
The predominant pollutants include nitrogen oxides, particularly nitric oxide and nitrogen dioxide, and volatile organic compounds.
What is atomsphere?The atmosphere is the thin layer of gases that surround out planet. It gives us the many varied climates, or long- term weather conditions around the world. The lithosphere is the solid part of the earth made up of rocks, minerals, and other elements excluding the ocean. It is the outermost part of the earth which includes the brittle upper portion of the mantle and crust.
The biosphere is the part of the planet where living things can be found from the upper reaches of the atmosphere to the bottom of the oceans and thermal pools and made up of the parts of earth where life exists- all ecosystem.The hydrosphere includes all of the water on earth from the oceans to glaciers and underground water and it can be liquid, vapour, or ice. The cryosphere includes all of the earth's frozen water, including glaciers,and sea ice.
Therefore, the predominant pollutants include nitrogen oxides, particularly nitric oxide and nitrogen dioxide, and volatile organic compounds.
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Brenda made the heliocentric model shown below to represent the sun, universe, Mercury, and solar system.
The picture shows a rectangle. Within the rectangle there is an oval. At the center of the oval there is a rhombus. On the right of the rhombus, within the oval, there is a symbol showing a small circle within a slightly larger circle, the two circles being concentric. On the right of the picture the key shows A equals rectangle, B equals oval, C equals rhombus, and D equals concentric circles.
What does the symbol for D in Brenda's diagram most likely represent? (2 points)
sun
universe
Mercury
solar system
D most likely equals Mercury
Answer:
The correct answer is option C, mercury
Explanation:
As per the Brenda’s venn diagram of Universe, the symbols used in this figure represents the following -
The rectangle shape – This represents the universe as it is the outermost shell that consist of solar system
The oval shape – This represents the solar system as the it is a galaxy of star. There are several galaxies of star that lies with in the universe.
The rhombus – The rhombus represents the center of the solar system and considering the heliocentric model of solar system, the sun lies at its center
The concentric circle – this represents mercury as it is a celestial body that revolve around the sun.
Which of the following are common pioneer species?
Select all that apply.
dogwood trees
conifer trees
small shrubs
lichens
cyanobacteria
Final answer:
Lichens, cyanobacteria, and small shrubs are common pioneer species that initiate ecological succession by colonizing barren environments, contributing to soil formation, and paving the way for other species to follow.
Explanation:
Pioneer species are the first organisms to colonize barren environments or disturbed areas, initiating the process of ecological succession. Primary succession occurs when these species establish themselves in environments that are devoid of soil, such as newly formed volcanic islands or areas left bare after a glacier retreats. The common pioneer species that can live on bare rock and contribute to soil formation through the weathering of rock and the accumulation of organic matter include lichens and cyanobacteria. Over time, as soil quality improves thanks to these organisms, other species, such as small shrubs, may also take hold. However, dogwood trees and conifer trees are not typical pioneer species as they may require more established soil conditions to grow.
Explain why methionine is the first amino acid
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Part d - how do you sequence the coi gene from your salmon sample?
Once you have obtained your salmon sample from a local store, you need to isolate the DNA from it and make many copies of the COI gene using the polymerase chain reaction (PCR).
To sequence the COI gene from a salmon sample, mitochondrial DNA is extracted, the COI gene fragment is isolated, amplified via PCR using specific primers, and the sequence is determined and compared with a database.
The cytochrome c oxidase I (COI) gene sequencing process begins with the extraction of mitochondrial DNA from the salmon sample. After extraction, a specific fragment from the 5' end of the COI gene is isolated, which is approximately 648 base pairs in length, although the entire gene consists of roughly 1500 base pairs.
This fragment is then amplified by polymerase chain reaction (PCR) using primers that are designed to bind specifically to the conserved regions flanking the COI gene of interest. The forward and reverse primers typically used for the amplification of the COI gene in animals are mentioned: lepF1, lepR1, vflf, and vf1r. PCR amplification is crucial as it generates multiple copies of the gene fragment, making it easier to determine its sequence.
Once amplified, the DNA sequence of the COI gene fragment is then determined using sequencing technologies. The obtained sequence is compared with reference sequences in a database to confirm the identity of the species or to explore genetic diversity among similar species. This comparison enables researchers to make determinations on species identification or evolutionary relationships based on the similarities or differences in the COI sequences.
Advances in DNA barcoding and the development of hand-held sequencers show promise for more practical and immediate applications, such as species identification in the field. Efforts are also underway to identify comparable barcoding genes for other organisms like plants and fungi, which may not have as much variability in the COI sequence or face complexities such as introns in the gene.
A gene codes for a protein that is 500 amino acids long. Which of the following mutations is likely to be the most deleterious? a) a missense mutation at the 490th codon b) a nonsense mutation at the 490th codon c) a nonsense mutation at the fifth codon d)a missense mutation at the fifth codon
The answer is C ) nonsense mutation at the fifth codon ! my major
The correct answer is:
c) A nonsense mutation at the fifth codon
Explanation:
A nonsense mutation at the fifth codon will lead to the appearance of a stop codon at this position, thereby the protein will lose its function
The copying mechanism of DNA is most likecarving a figure out of wood.dripping water out of a faucet.taking a picture of yourself and of your reflection in a mirror.mixing flour, sugar, and water to make bread dough.
The correct answer is: taking a picture of yourself and of your reflection
This example above can be compared to copying mechanism of DNA-replication in which one strand of DNA (e.g. 3’-5’ orientation) is used as a template to make new strand with opposite orientation (5’-3’). Picture of yourself is a template and a picture of reflection is copied strand.