Answer:
The insects developed pyrethroid resistance.
Explanation:
Pyrethroid Insecticides:
Pyrethroids are synthetic derivatives of the natural compounds, pyrethrins, produced by Chrysanthemum plants to prevent insect attacks.Pyrethrins work by locking sodium channels in the cell membrane. This inhibits nerve impulses and paralyses the insect, ultimately resulting in its death. In the 1940s, synthetic pyrethroid insecticides were first used on auricular crops. But till the 2000s, 100 of insect species were resistant. This occurred due to the fact that the allele for pyrethroid resistance increased throughout the population.Pyrethroid resistance developed to enable the insects to survive. Natural selection allowed an exponential transfer of insecticide resistance genes throughout the insect population.Three major mechanisms of resistance were identified by scientists:Increased expression of genes involved in toxin detoxification.Decrease in sensitivity of the target proteins (on which pyrethrins act).Decrease in the insecticide penetration through the cuticle.Answer:
B) The allele for pyrethroid resistance increased throughout the population.
Explanation:
The allele for pyrethroid resistance increased throughout the population. Variation exists. The allele for resistance remained as those insects not resistant died out. Over time the resistant allele in the populations increased.
_____which is most likely to form a negative ion?
Plz help me
Final answer:
Atoms from nonmetals, especially in groups 16 and 17, are likely to form negative ions (anions), while metals will typically form positive ions (cations). Phosphorus (P) would form a P³⁻ anion, while magnesium (Mg) and aluminium (Al) form Mg²⁺ and Al³⁺ cations, respectively.
Explanation:
Formation of Ions and Expected Charges
In chemistry, atoms form ions to achieve a more stable electronic configuration that is similar to the nearest noble gas. Nonmetals, particularly those in groups 16 and 17, tend to gain electrons to become negatively charged anions. On the other hand, metals often lose electrons to form positively charged cations.
For example, phosphorus (P), being in group 15, would be expected to form a negative ion (P³⁻). Nonmetals with strong oxidizing properties, such as chlorine (Cl) and oxygen (O), form stable negative ions by gaining electrons, resulting in Cl⁻ and O²⁻ respectively.
The condition of the Rh factor is called ___when present and___ when absent.
please help asap!
Answer:
Explanation:The condition of the Rh factor is called __RH positive_when present and__rh negative_ when absent.
Answer:
The condition of the Rh factor is called Positive when present and Negative when absent.
Explanation:
In as much detail as possible, explain what crossing over is, including when it occurs, why it
occurs, and how it contributes to genetic variation: *
Explanation:
Crossing over is an important section of the normal segregation of the chromosomes in case of the meiosis. Crossing over happens due to the genetic variations, as the genetic materials gets alter at the time of crossing over. The chromatids that are bind together with the help of the centromere do not remain similar in this case. Crossing over gives rise to variation because the alternation takes place between the nonidentical chromatids having different characteristics or traits. Sometimes gives rise to completely new trait which is not present in both the parents this condition makes the . genetic diversity.
1. What is a karyotype?
Which of the following would play the greatest role in biological resistance?
a) Genetic Drift
b) Gradualism
c) Natural Selection
Answer:
C) Natural selection..
Final answer:
Natural Selection is the key factor in biological resistance, influencing the adaptation and survival of populations over time.
Explanation:
Natural Selection plays the greatest role in biological resistance among the given options. Natural selection is the process by which specific traits that aid in survival are favored and passed on to future generations, leading to the adaptation of a population to its environment.
Genetic drift and gradualism also influence evolution but do not play as significant a role in biological resistance as natural selection does. Genetic drift is a random fluctuation in allele frequencies, while gradualism pertains to a slow, steady change over time.
For example: In a population of bacteria exposed to antibiotics, individuals with genetic variations that confer resistance to the antibiotic will survive and reproduce, passing on this resistance to their offspring. Over time, the population will become more resistant due to natural selection.
The plasma membrane separates the __________ from the __________.
a. cytoplasm; nucleoplasm
b. interstitial fluid; cytoplasm
c. cytoplasm; mitochondria
d. interstitial fluid; blood
Answer: The right answer is a. cytoplasm; nucleoplasm
Explanation:
The plasma membrane separates the cytoplasm from the neucloplasm
Summarize how the climate of the Miocene epoch impacted the evolution of hominins
Answer with Explanation:
The Miocene epoch was deeply characterized by seasonal conditions, such as having more colder winters in the northern areas.
In the late Miocene, open vegetation system expanded. These included grasslands, woodlands and shrublands. As a result, more primates inhabited the area. Several habitats became diverse from each other, thus allowing the species to adapt, including their locomotion. For example, the species who used to live on trees, turn towards living on land (terrestrial life). Certain animals also came about such as pigs, giraffes, monkeys, etc. Scavenging hominins also scattered. When it comes to hominins, a major type of locomotion evolved called "bipedalism." This allowed the hominins to walk using the lower limbs (two feet).
Answer:
The Miocene epoch was deeply characterized by seasonal conditions, such as having more colder winters in the northern areas. In the late Miocene, the open vegetation system expanded. ... As a result, more primates inhabited the area.
Explanation:
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How do beach nourishment and vegetation management differ in the ways they manage beach erosion?
1.Only vegetation management replaces sand on the beach.
2.Only beach nourishment provides protection from floods.
3.Only beach nourishment uses a hard structure to manage erosion.
4.Only vegetation management brings in plants to keep sand on beaches!
Only beach nourishment uses a hard structure to manage erosion.
Both relocate materials back to the shore
Beach nourishment refers to the addition of sand on the beach to reduce the erosion effect by water currents.
Vegetation management is the (re)plantation of plants to reduce the erosion effect on beaches caused by waves.
In the statements given above, the addition of hard structure doesn't primarily means beach nourishment, likewise, vegetation management doesn't replace the sand on the beach but rather prevents sand erosion. However, vegetation management brings in plants that hold the sand, especially on dunes. Floods cannot be controlled by beach nourishment but with the help of plants, their impact can be minimized.
Therefore, the correct answer is option
3. Only beach nourishment uses a hard structure to manage erosion.
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Using the terms hypertonic and hypotonic, describe the osmotic relationships of the solution within the dialysis bag versus the solution outside the bag.
Explanation:
By osmosis, due to the difference in osmotic pressure on either side of the membrane, the water passes through the membrane, which means that the water moves from high osmotic pressure / concentration regions to low pressure / concentration regions to a stable state. Thus, water moves from hypotonic regions (low solute concentration) to hypertonic regions (high solute concentration).
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In biology, osmosis is the diffusion of water across a semipermeable membrane. A hypertonic solution has a higher solute concentration, causing water to move into the bag. A hypotonic solution has a lower solute concentration, causing water to move out of the bag.
Explanation:Hypertonic and Hypotonic SolutionsIn biology, osmosis refers to the diffusion of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. When comparing the solution inside the dialysis bag and the solution outside the bag, we can determine their osmotic relationships.
Hypertonic SolutionA hypertonic solution has a higher solute concentration compared to the solution it is being compared to. If the solution inside the dialysis bag has a higher solute concentration than the outside solution, it is hypertonic. In this case, water will move from the outside solution into the dialysis bag, causing the bag to swell or gain water.
Hypotonic SolutionA hypotonic solution has a lower solute concentration compared to the solution it is being compared to. If the solution inside the dialysis bag has a lower solute concentration than the outside solution, it is hypotonic. In this case, water will move from inside the dialysis bag to the outside solution, causing the bag to shrink or lose water.
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(4. Synthesize How did Darwin's
observations support Lyell's theory
of an ancient Earth undergoing
continual geologic change?
Darwin's observations of fossils and landscape changes provided evidence supporting Lyell's theory of an ancient Earth shaped by gradual geological processes, thereby giving credence to the sufficient time needed for evolution by natural selection.
Explanation:Charles Darwin's observations during his voyage on the HMS Beagle provided support for Charles Lyell's theory of an ancient Earth undergoing continual geologic change. Lyell proposed that geological change occurred gradually over long periods of time through processes still operating today, as opposed to sudden, catastrophic events. In light of Lyell's concepts, Darwin's discovery of sea life fossils high in the mountains indicated that the Earth's landscape had been reshaped over millions of years, which was compatible with his theory of evolution through natural selection. This slow and continuous change in geology suggested by Lyell allowed Darwin to consider that similarly gradual biological processes could lead to the evolution of species.
Darwin's reasoning, influenced by Lyell, was threefold: he recognized that species could change over time; he acknowledged the ancient Earth allowing sufficient time for evolution, given the diversity of life; and he saw the implication of a 'struggle for existence' from population pressures. Lyell's ideas, alongside the likes of Lamarck and Malthus, provided key frameworks for Darwin to propel his own evolutionary theories forward.
Darwin's observations of fossils, geological formations, and coral reefs supported Lyell's theory of gradual, uniformitarian geological change over immense periods.
Here are a few key points on how Darwin's observations supported Lyell's theory:
1. Geological Formations:
Darwin observed various geological formations during his voyage, such as sedimentary rocks, volcanic islands, and coral atolls. These formations suggested to him that the Earth had undergone extensive changes over vast stretches of time rather than through sudden cataclysmic events.2. Fossils and Succession:
Darwin collected numerous fossils, particularly in South America, which indicated a sequential order of species over time. This supported Lyell's idea that current geological processes, such as sedimentation and erosion, have been acting consistently and gradually over millions of years, leading to the deposition and preservation of fossils in layers.3. Coral Reefs:
Darwin's study of coral reefs, especially the subsidence theory he proposed to explain their formation, reflected his understanding of gradual geological processes shaping the Earth's surface. This fit well with Lyell's perspective that geological changes are continuous and occur at a steady pace.4. Volcanic Activity:
Witnessing volcanic eruptions and studying the geological impact of volcanic islands like the Galápagos further reinforced Darwin's belief in gradual change over time. It aligned with Lyell's argument that volcanic activity, though episodic and dramatic in appearance, contributes to long-term geological evolution when considered over vast time spans.Captive breeding
Definition
Answer:
many zoos, aquariums, and other institutions are involved in captive-breeding programs that try to breed endangered or threatened animals
Explanation:
Answer:
Captive breeding is the process of breeding animals in controlled environments within well-defined settings, such as wildlife reserves, zoos and other commercial and noncommercial conservation facilities.
Explanation:
If oceanic carbon intake remains constant, what two factors decrease the amount of atmospheric carbon dioxide?
A: Decreasing the amount of soil and decreasing the amount of biomass.
B: Increasing amount of fossil fuels being burned and increasing soil production.
C: Increasing biomass and decreasing the amount of fossil fuels being burned.
Answer:
A
Explanation:
Biomass=Bad
Decreasing the amount of soil and decreasing the amount of biomass decrease the amount of atmospheric carbon dioxide. Hence option A is correct.
What factors affect the amount of atmospheric carbon dioxide?When animals breathe or decay (decompose), carbonate rocks are worn, forest fires happen, and volcanoes erupt, carbon dioxide is naturally released into the atmosphere. Human activities such as the combustion of fossil fuels, the destruction of forests, and the manufacture of cement all contribute to the atmospheric addition of carbon dioxide.
The primary cause of the rise in carbon dioxide concentrations is the use of fossil fuels by humans as a source of energy.
We are adding carbon to the atmosphere in only a few hundred years that plants removed from the atmosphere through photosynthesis over many millions of years in the form of fossil fuels like coal and oil. Hence, option A is correct.
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What happens at the end of transcription? -apex
A) mRNA is put together from amino acids.
B) the double helix unwinds.
C) the transcription process stops.
D) RNA polymerase is guided to the correct place.
Answer:
The correct option is C) the transcription process stops.
Explanation:
At the end of transcription, the mRNA is generated and the process of transcription stops. Transcription can be described as the process by which mRNA is made form the DNA. After the process of transcription ends, the mRNA is transported to the ribosomes of the RER, where it is translated into the amino acids which join through peptide bonds to form proteins.
Answer:
A: the transription process stops
Explanation:
Which vitamins are not stored in body fat, and why?
Explanation:
Water-soluble vitamins (which dissolve in water), such as vitamin C and the B vitamins, are not stored in the body and must be replaced every day.
Answer:
Small amounts of vitamin A, vitamin D, vitamin E and vitamin K are needed to maintain good health. Fat-soluble vitamins will not be lost when the foods that contain them are cooked. The body does not need these vitamins every day and stores them in the liver and adipose (fat) tissue when not used.
Which VERY important process MUST occur prior to cell division and why?
Question 4 options:
Protein Synthesis must occur prior to cell division in order for cells to grow properly.
DNA Replication must occur prior to cell division because T bases should not be created in new cells.
DNA Replication must occur prior to cell division because DNA carries the coding or instructions for all cell function.
Transcription must occur prior to cell division because RNA needs to be able to leave the nucleus for cells to divide.
how do gloves help you stay safe in a laboratory
Answer:
in case of an accident you wont get it on your bare skin and hand.
Explanation:
you dont want to get hurt.
Answer:
Protection
Explanation:
gloves protect your hands from chemicals if they spill
true or false questions. grade nine science exam.
Question 5 (3 points)
What molecule will be produced at the end of the process shown in the illustration?
Growing
Polypeptide
Chain of Amino Acids
o Amino acid
SPeptide Bond
ERNA
protein synthesis
Translation
Anti-codon
Codon
mRNA
Ribosome
the options are : protein, DNA, ATP, carbohydrate
Answer:
The answer is protein.
Explanation:
The process described in the scheme is translation which is the final step of the central dogma of molecular biology. The central dogma of molecular biology traces the transfer of genetic information from DNA to RNA to Protein. Translation is the generation of a protein or polypeptide chain by the decoding of the mRNA sequence by tRNA into amino acid sequences corresponding to a certain protein.Every tRNA carries a specific amino acid at one end and its corresponding anticodon on the other. The anticodon on the tRNA is complementary to a specific codon on the mRNA. The tRNA uses this anticodon to identify and decode the codons on mRNA.The entire protein synthesis takes place inside the ribosomes which are the cell's principal organelles for protein synthesis.Which cells in our bodies do not divide in our bodies?
Answer:
the answer is nerve cells
What information is coded in the complex molecule?
How does a chemical reaction obey the law of conservation of matter?
A)The same number of reactant particles as product particles are involved in the reaction.
B)The same total number of chemical bonds are in the reactants as are in the products.
C)The same number of molecules appear in the reactants as appear in the products.
D)The total mass of the reactants is equal to the total mass of the products.
Answer:
D)The total mass of the reactants is equal to the total mass of the products.
Explanation:
Law of conservation of energy states that matter can neither be created nor be destroyed but it can change from one form to another.
In a chemical reaction, the total mass of the reactants and the total mass of products remains the same. The same amount of matter ends up in the product as was the total mass in the reactants. The conservation of mass will be depicted in a balanced chemical equation.
The correct answer is D) The total mass of the reactants is equal to the total mass of the products.
The law of conservation of matter states that matter cannot be created or destroyed in an isolated system. This means that the mass of the reactants at the beginning of a chemical reaction must be equal to the mass of the products at the end of the reaction. The law does not require that the same number of reactant particles, the same total number of chemical bonds, or the same number of molecules be present in the reactants and products. Instead, it is the total mass that remains constant.
For example, consider the chemical reaction where 2 hydrogen gas molecules (H2) react with 1 oxygen gas molecule (O2) to form 2 water molecules (H2O). The balanced chemical equation is:
[tex]\[ 2H_2 + O_2 \rightarrow 2H_2O \][/tex]
In this reaction, 4 hydrogen atoms (2 molecules of H2) and 2 oxygen atoms (1 molecule of O2) react to form 2 water molecules, each containing 2 hydrogen atoms and 1 oxygen atom. Although the number of molecules and the number of chemical bonds change during the reaction, the total mass of the reactants (4 hydrogen atoms + 2 oxygen atoms) is equal to the total mass of the products (2 water molecules, each containing 2 hydrogen atoms and 1 oxygen atom).
Therefore, the conservation of mass is upheld, as the mass of the reactants is equal to the mass of the products, which is the essence of the law of conservation of matter.
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A scientist is studying two traits on a fruit fly. She discovers that these are most often inherited together.
What can be said about these traits?
1. They are on the same chromosome and are influenced by epistasis.
2. They are on the same chromosome and are linked together.
3. They are on different chromosomes, and each trait is controlled by many genes.
4. They are on different chromosomes and are linked together.
CHOOSE FROM THE ANSWERS ABOVE PLZ!!!
Answer:
I think maybe its 2
Explanation:
Final answer:
When traits are inherited together in fruit flies, it indicates that the genes controlling these traits are on the same chromosome and are linked together.
Explanation:
When a scientist observes that two traits in a fruit fly are most often inherited together, it implies that these traits are likely linked. In genetics, linked genes are genes that are located on the same chromosome and tend to be inherited together because they are close to each other and do not assort independently. The correct answer is therefore that the traits are on the same chromosome and are linked together.
Linked genes result in traits that are commonly seen together. An example in humans could be the linkage between hair color and eye color, leading to combinations like blonde hair with blue eyes, or brown hair with brown eyes. Such linkages occur when genes are located near each other on the same chromosome, making them less likely to be separated during the crossing over process in meiosis.
Help me labels this
2. Parieto temporal suture.
3. Parietal bone.
4. Occipital bone.
5. Temporal bone.
Explanation:The 1 as mentioned is the nasal bone. It is joint with the maxilla and forms the structure of nose.
The marking of 2 is the Parieto temporal suture. This suture is a squamosal suture, with a peculiar type of structure. This joins two bones namely parietal bone and temporal bone.
The 3 is the parietal bone. This bone joins with Frontal bone at front, temporal bone on sides, with another parietal bone on the middle, and occipital bone in the posterior part.
4 is the occipital bone which joins with the parietal bone in lambdoid suture.
And the 5 is the temporal bone present laterally to cranial cavity.
A cell is in_
when solute concentrations inside and outside the cell are equal.
concentration
equilibrium
solution
diffusion
Answer:
A cell is in equilibrium when solute concentrations inside and outside the cell are equal.
Explanation:
The equilibrium is state when the concentration of the system is same both inside and outside. There will be movement in the particles of the solute in which the cell is placed although its a equilibrium state. but the movement will not cause any further changes to the concentration of the solution because there will be movement of same and equal number of particle in the same direction. A cell in a human body cannot be in a equilibrium state because the human body requires a continuous and constant flow of materials into and out of the cell in order to keeps the metabolic pathways from attaining equilibrium so as to make the cell to do work throughout the life.
1. True or False: Bacteria are larger than human cells.
lisa
Fe
True
False
Bacteria are smaller than human cells. So the statement is false.
What is the size of a bacterial cell?Bacteria and archaea are classified under the domain prokarya. They are unicellular organisms found in a wide range of extreme environments.
Bacteria are known to exhibit a variety of shapes and sizes. Bacteria also vary in their way of an arrangement with their colony of bacterial cells.
Bacteria are mostly microscopic but some bacteria, large enough to be visible by the unaided eye have been observed. The size of bacteria generally ranges from 0.2 to 2.0 micrometers. The size of bacteria is a very important factor in their survival.
Bacteria are able to thrive in a variety of microenvironments due to their small size. The size of bacteria also contributes to their parasitic nature.
The high surface area to volume ratio allows them to take as many nutrients as possible.
Therefore, bacterial cells are smaller than human cells and the statement is false.
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What is true of mass extinctions?
A All life on Earth dies when a mass extinction happens
B In each mass extinction, over 50% of animal species died.
C Mass extinctions happen frequently.
D There is no evidence for past mass extinctions.
Answer: I think the answer is B
Explanation:
Answer:
b
Explanation:
mostly 99% of all species die
ASAP PLEASE IF YOU KNOW.
Which level of organization is formed from two or more different tissues that group together and perform a function?
Answer:
When two or more different tissues group together to perform a function is called Multi cellular organism.
Explanation:
Every living organism contain one or more cells.Those organisms which perform its function with the help of single cell are called Unicellular Organism. For example- Amoeba contain single cell through which they perform locomotion, reproduction etc.Organisms that are formed by more than one cell which form tissue and division of labour takes place.This type of organisms are called as multi cellular organism. For example, Human is the large multi cellular animal that contain many cells that form tissue and tissues together form organs. Thus a complex organisation takes place.For example, epithelial tissues that are found in skin surface, reproductive tract, inner digestive tract perform functions like secretion, excretion,absorption etc.An organ is the level of biological organization formed when two or more different tissues group together to accomplish a specific function. Organs like the stomach, heart, or brain are made up of tissues such as muscle and connective tissues, and these organs make up part of organ systems.
The level of organization that is formed from two or more different tissues that group together to perform a specific function is known as an organ. In multicellular organisms like humans, different tissues such as muscle tissue, connective tissue, and nervous tissue work in harmony to form organs, for example, the stomach, heart, or brain. These organs then collectively make up various organ systems, such as the digestive system, circulatory system, or nervous system, which contribute to the functioning of a living organism.
Understanding the structure and function of cells is crucial to comprehend the roles of tissues, and this knowledge, in turn, helps grasp how organs perform their functions. The study of epithelial and connective tissues provides insight into the complex interactions that enable organs to operate efficiently within living organisms.
who was the first person to discover lightning to be electricity…?
Answer:
Benjamin Franklin
Explanation:
REMEMBER THE KEY ON THE END OF THE KITE!
Final answer:
Benjamin Franklin was the first person to discover that lightning is a form of electricity through his kite experiment, influencing future scientific research in the field of electricity.
Explanation:
The first person to discover that lightning is a form of electricity was American polymath Benjamin Franklin. Through his experiment involving flying a kite during a thunderstorm, Franklin demonstrated that sparks drawn from a key tied to the kite string were similar to those produced by static electricity. This illustrated the direct connection between the grand scale of an electrical storm and electricity at a more human scale, contributing significantly to the understanding of electromagnetic forces. Franklin's innovative work initiated widespread exploration in the field of electricity, influencing other scientists like Luigi Galvani, who experimented with static electricity in frog muscles, and Alessandro Volta, who developed the first electric battery.
Which behaviors are most likely to be prohibited in a safety contract?
talking during the lab
modifying the lab procedure without the teacher's permission
leaving active heat sources unattended
calling 911 during an emergency
using laboratory chemicals for practical jokes or tricks
Answer:
2,3,5
Explanation:
i just finished it.
Can someone help me with this ?