Answer:
Answer is both
Explanation:
Muscles cells get excite when they get impulse Ca++ ions are involve in it.
Neurons are also excitalble. And Na+ ions involve in it.
Muscle cells and neurons, both types of cells display the property of electrical excitability, hence option C is correct.
How neurons are electrical excited?Neurons' resting membrane potential lies between -40 and -90 mV. The majority of cells in the body, including those that are polarized, have an imbalance of charges across their membranes. They also display membrane potentials.
Rheobase and chronaxie are two variables that express the muscle's excitability. The rheobase is the maximum amount of electric current that can excite tissue no matter how long it is applied.
Chronaxie, on the other hand, is the length of time needed to excite a tissue when the stimulus' strength is double that of the rheobase.
Therefore, muscle cells and neurons, both types of cells, display the property of electrical excitability.
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The diagram shows the female reproductive system. What structure is indicated by the arrow?
Arrow is pointing to the cavity in the center of the female reproductive system, to which the fallopian tubes and the vagina lead.
Cervix
Ovary
Uterus
Vagina
Final answer:
The structure indicated by the arrow in the diagram of the female reproductive system is the uterus, a pear-shaped muscular organ that is central to pregnancy, menstruation, and childbirth.
Explanation:
The structure indicated by the arrow in question, which points to the cavity in the center of the female reproductive system, is the uterus. The uterus is a pear-shaped muscular organ that is connected to the Fallopian tubes at its upper end, and it connects to the vagina through the cervix at its lower end. The primary function of the uterus is to nourish and carry a fetus during pregnancy, and it plays a vital role in the menstrual cycle and childbirth process. The other options, such as the ovary, which produces eggs and secretes estrogen, and the cervix, which is the lower part of the uterus, are different parts of the female reproductive system.
Which of the following is the best modern definition of evolution?
A) descent with modification
B) change in the number of genes in a population over time
C) survival of the fittest
D) inheritance of acquired characters
your answer should be A. “descent with modification.”
Mark me brainliest please
Final answer:
The best modern definition of evolution is A) 'descent with modification', as it reflects the process through which species change over generations influenced by the mechanism of natural selection.
Explanation:
The best modern definition of evolution is A) descent with modification. This definition encapsulates the fundamental concept that species change over time, giving rise to new species through the mechanism of natural selection. Charles Darwin, one of the forefathers of the evolutionary theory, defined evolution using this phrase, meaning that while species share a common ancestor, the attributes of their descendants alter over the generations. Therefore, characteristics of offspring differ both from their parents and from one another.
Over many generations, those traits that provide an evolutionary advantage in reproducing and surviving in a given environment are more likely to be passed on, leading to significant changes in a species. This stands in contrast to the incorrect notions of evolution such as C) survival of the fittest or D) inheritance of acquired characters, which don't fully capture the complexity and the genetic basis of evolutionary change.
If astronomers discovered a new inner planet in the solar system, which characteristic would it most likely have?
large size
gaseous composition
many moons
fast revolution
Should be FAST REVOLUTION...
Brainly please!
Answer:
Fast revolution
Explanation:
The inner planets are composed of metallic rocks. They have rocky surface. The inner planets are Mercury, Venus, Earth and Mars. These are very small as compared to outer planets (Jupiter, Saturn, Uranus and Neptune). Also, the inner planets have very less moons as compared to outer planets. Outer planets have gaseous composition; mainly of hydrogen and helium.
The inner planets revolve around the sun faster than the outer planets. From Kepler's planetary law, we understand that the closer a planet to a star, faster would be its revolution and smaller would be its orbital period.
Thus, a new inner planet in the solar system would most likely have fast revolution.
The microscopic view of sandstone contains what two components?
Sand Grains and Cement
A double slit arrangement produces interference fringes for yellow sodium light. To produce narrower-spaced..?fringes, should red light or blue light be used?
Answer:
Blue light
Explanation:
Bcoz fringe widht is directly proportional to wavelength of light
And red has longest wavelength
Blue has shortest
In gel electrophoresis DNA molecules migrate from _____ to _____ ends of the gel.
a, acidic ... basic
b, negative ... positive
c, basic ... acidic
d, long ... short
e, positive ... negative
Answer:
b, negative ... positive
Explanation:
Gel electrophoresis is a method used in molecular biology for DNA analysis. This method includes the separation of DNA fragments through the gel according to their size or shape under the influence of aplid electric current. Since the fragments of DNA are negatively charged, they will move from negative to positive end.
Small fragments will move faster than larger ones.
One of the major source of error is contamination of the DNA sample. This refers to the presence of foreign DNA in the sample of interest. As a consequence, the gel will have more bands.
Another errors might appear as a result of wrong concentration of the gel, wrong buffer pH, high/low concentration of dye etc.
Final answer:
DNA molecules migrate from the negative to the positive end of a gel in gel electrophoresis due to their negative charge.
Explanation:
In gel electrophoresis, DNA molecules migrate from the negative to the positive ends of the gel due to the net negative charge of the phosphate groups in the DNA backbone. This technique separates DNA fragments based on size - smaller molecules navigate through the gel's pores faster than larger ones. Consequently, the correct answer to the student's question is that DNA molecules migrate from negative to positive ends of the gel, which corresponds to option b.
The Miconia plant is not a native plant to Hawaii. Since its introduction into Hawaii 40 years ago, it has become a popular decorative plant. However, this shallow-rooted plant has replaced many of the native deep-rooted plant species and increased the likelihood of landslides on the island. Which is one of the BEST methods of dealing with this invasive plant
a ; The plant should be cross-bred with deeper-rooted plants.
b ; The plant should be shared with the smaller islands.
c ; The plant should be fed to the native livestock on the island.
d ; The plant should be uprooted from all regions in the island.
Answer:
A
Explanation:
A is correct because cross-breeding will allow for deeper roots which in turns decreases the amount of landslides. It isn't B because they aren't doing anything about the plant on that island, not helping anything. For C and D, even if the plant was uprooted or taken out of the ground to be fed to live stock, seeds would still be left in the ground allowing more to grow.
Brainliest will be given!!!
Look at the diagram of a solar eclipse.
At which location is the solar eclipse viewed in totality?
1
2
3
4
Answer:
The answer to this question is 3
Timothy has attached earlobes like his maternal grandfather. His mother and father both have free earlobes, which are dominant. Which statement best explains how Timothy inherited attached earlobes? F He received a dominant allele from his mother and a recessive allele from his father. G He received a dominant allele from each parent. H He received a recessive allele from his mother and a dominant allele from his father. J He received a recessive allele from each parent.
its H because his maternal grandfather is on his moms side of the family and has the recessive allele not his grandfather on his dad's side
Why is it likely that MOST speciation is allopatric?Because disruptive selection between forms of traits in sympatric populations is always very strong.Because vicariance events are common.Because related species are always found in allopatry rather than in sympatry.Because gene flow between populations prevents genetic divergence in sympatry.Because gene flow between diverging populations is strong in allopatry.
Answer:
Because gene flow between populations prevents genetic divergence in sympatry
Explanation:
Allopatric speciation is a form of speciation (creation of new species) that occurs as a result of geographic isolation. This means that a part of population becomes physically separated from the initial main population. There is no gene flow between these two populations and as a result the two populations reach a high level of genetic divergence. They can no longer interbreed which means they become two different species (speciation).
New populations evolve as result of mutation, genetic drift and natural selection.
Sympatric speciation is a form of speciation without geographic isolation, usually due to the reproductive isolation or changes in the chromosomes of the organism.
Most speciation is likely to be allopatric because it involves the geographic separation of populations, restricting gene flow between them and allowing for genetic divergence and the development of new species over time.
Explanation:In most cases, speciation occurs through allopatric speciation, which involves the geographic separation of populations from a parent species and subsequent evolution. This is because isolation of populations is more likely to occur and persist in allopatry than in sympatry. Allopatric speciation can result from events such as dispersal, where a few members of a species move to a new area, or vicariance, where a natural situation physically divides organisms. This geographic separation restricts gene flow between populations, allowing for genetic divergence and the development of new species over time.
*5 Minutes LEFT*The scatter plots indicate the population of rabbits in the population over time. The y-axis represents the number of rabbits and the x-axis is time.
Which graph *most likely* represents a rabbit population that found a new, larger habitat, but then eventually experienced an increase in predation?
Graph A
Graph B
Graph C
Graph D
Answer:
The answer to that is C, just took the same quiz.
Explanation:
increases and then decreases because of predators. Hope this helps :)
Where in the cell does transcription occur?
Nucleus. Transcription is the process in which DNA is being copied to RNA and this process occurs in the Nucleus. Hope that satisfies your question
Which of the following real-world examples models linear motion? A. Throwing a rock in the air at a 60-degree angle B. Throwing a rock in the air at a 45-degree angle C. Running 50 m along a straight track D. Running around the curve of a track
Answer:
c is the correct option
Answer:
Option C, Running 50 m along a straight track
Explanation:
Linear motion is one directional motion which requires only one dimension to explain it. This motion is along a straight line.
In all other options either the motion is taking place along a curved path(as in option D) , thereby making it a curvilinear motion or the motion is taking place at some angle (as in option A and B) thereby making it angular motion.
hence, option C is correct.
A eukaryotic gene is most likely to be transcribed if it is located where?
Answer:
in a euchromatic region of the genome
the first land plants that appeared 500 million years ago resembled today's...?
For the first four billion years of Earth’s history, continents would have been devoid of all life except microbes.
a. True
b. False: rodents and rabbits should not be fasted prior to surgery because they are unable to vomit due to their esophageal physiology, unless there are other medical/scientific reasons for doing so.
Answer:
The answer would be: True
Explanation:
The given statement is true.
Explanation:
The surgery procedure in animals differs. In case of animals such as cat or dog, they must not be feed before surgery and must be kept in fasting phase. On contrary in case of rodents and rabbits they must not fast before the surgery unless the medical condition of the animal demands so.
The reason behind feeding before surgery in case of rodent and rabbit is that, it is nutrient obtained from food and water helps in quick recovery of the animals in post operational stage and also it is a tedious process to make them eject out the digested content before surgery due to their esophageal physiology.
Which of the following samples will have the greatest volume at STP?a. 22 g Neb. 22 g Hec. 22 g O2d. 22 g Cl2 e. All have the same V at STP
Answer:
22g of He
Explanation:
Volume of gas at STP is given as :
Volume occupied(dm³) = number of moles x 22.4dm³mol⁻¹
In order to solve this given problem, we would first find the number of moles from the different masses of atoms and molecules given.
Number of moles = [tex]\frac{mass }{Molar mass}[/tex]
Now, let us obtain the molar mass of the given atoms and elements:
For Ne; molar mass is the atomic mass = 20gmol⁻¹
He = 4gmol⁻¹
O₂ = (16 x2)gmol⁻¹ = 32gmol⁻¹
Cl₂ = (35.5x2)gmol⁻¹ = 71gmol⁻¹
Number of moles of Ne = [tex]\frac{22}{20}[/tex] = 1.1mol
Volume occupied by Ne at STP = 1.1 x 22.4 = 24.64dm³
Number of moles of He = [tex]\frac{22}{4}[/tex] = 5.5mol
Volume occupied by He at STP = 5.5 x 22.4 = 123.2dm³
Number of moles of O₂ = [tex]\frac{22}{32}[/tex] = 0.688mol
Volume occupied by O₂ at STP = 0.688 x 22.4 = 15.4mol
Number of moles of Cl₂ = [tex]\frac{22}{71}[/tex] = 0.3099mol
Volume occupied by Cl₂ at STP = 0.3099 x 22.4 = 6.94dm³
Which scenario describes a way that an abiotic factor can impact a marine system? Liquid water turning into solid ice encourages animal hibernations. Predation on krill is higher at the surface than at the depths. Rapid increases in water temperature cause extensive fish kills. Reproductive rates of seals show a dramatic increase.
Answer:
Rapid increases in water temperature cause extensive fish kills
Explanation:
Biotic factors are all living organisms that contribute to an ecosystem. On the other hand, abiotic factors are non-living factors, such as climatic factors (temperature, rainfall, wind), edaphic factors (soil type, soil texture, soil aeration etc). Changes of abiotic factors can have a huge influence on living organisms of ecosystem. The effects might be benefical or harmful.
Some of the most common abiotic factors that can impact a marine ecosystem are water temperature, currents, light, alkalinity, oxygent concentration etc.
An enzyme is a protein that A)transports nutrients across a membrane B) increases the rate of a chemical reaction C)receives and sends signals across a cell D)provides structure for the cell's organelles
An enzyme is a catalyst for chemical reactions. Catalyst means that it "speeds up" something. This means that the answer is:
B) Increases the rate of a chemical reaction
Hope this helped!
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Population A is made up of living animals. The members of population B feed on these living animals. What type of relationship is represented by population A and B?
Answer:
meow
Explanation:
fr fr
as In the case of Marie curie, prolonged exposure to radioactivity of any kind can lead to all but one of these results
Pneumonia is not a result of prolonged radioactivity exposure, most especially regarding the cause of death of Marie Curie. In fact, pneumonia is primarily caused by bacteria and viruses infecting our lungs most specifically the alveoli. This alveoli gets filled with fluid, like water, that would cause extreme coughs.
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If the environment were to change dramatically
or if a new plant disease were to be introduced,
which plant species would be the most likely to
have individuals that could survive the disease?
(1) Species A
(3) Species
(2) Species
(4) Species D
Final answer:
The plant species with the greatest genetic diversity, which in this case is Genus B, would most likely survive a new disease due to a higher chance of having advantageous traits. Option 3.
Explanation:
If a new plant disease were introduced or if there was a dramatic environmental change, the plant species most likely to have individuals survive the disease would be the one with the greatest genetic diversity. According to the information provided, Genus B has greater genetic diversity compared to Genus A, which means Genus B is more likely to have traits that confer an advantage in a new environment. Moreover, it is suggested that plant species that are pest-resistant such as those that could thrive in warm temperatures may have a better chance of survival in certain climate changes.
Considering the other options provided, such as drought resistance in different climates, these qualities are not directly linked to disease resistance. Therefore, they are less relevant when considering a plant species' ability to survive a new plant disease. Additionally, while Species D may have different feeding habits (according to option d provided), this is less relevant to disease resistance.
Ultimately, the adaptive traits that come with greater genetic diversity can provide a buffer against disease by potentially having various resistance genes and mechanisms. Therefore, species within Genus B with greater genetic diversity would be the most likely to survive a plant disease.
Which organelles contain genetic information that is used for specifying traits of an organism?
Answer:
Nucleus
Explanation:
The nucleus and mitochondria are the primary organelles that contain genetic information for specifying traits. The nucleus houses the majority of genetic material in chromosomes, while mitochondria have their own DNA, typically inherited from the mother.
Explanation:The organelles that contain genetic information used for specifying traits of an organism are mainly the nucleus and the mitochondria. The nucleus houses most of the genetic material in the form of chromosomes, which are long strings of deoxyribonucleic acid (DNA). Sequences of DNA in these chromosomes make up genes that control or partially control visible traits. An organism's DNA and genes largely determine its characteristics.
Mitochondria, another essential organelle, have their own DNA separate from the nucleus. Mitochondrial DNA is inherited from the mother and mutates at a rapid rate. This unique characteristic of mitochondrial DNA makes it useful in genetic studies and genealogy tracing.
Both of these organelles, the nucleus, and the mitochondria, play crucial roles in genetic inheritance and the specification of an organism's traits.
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Which of these is an example of an extinction that has been witnessed by humans?
The dodo bird is an example of a species whose extinction was witnessed by humans, occurring around 1662 due to hunting and invasive species introduced by humans. Option a is correct.
The dodo bird lived in the forests of Mauritius, an island in the Indian Ocean, and became extinct around 1662. Humans played a significant role in its extinction by hunting it for meat and introducing invasive species like pigs, rats, and dogs, which preyed on the dodo's eggs and young. This unfortunate event has been recorded in human writings and provides a clear example of how human activities can lead to the extinction of a species.Complete question as follows:
Which of these is an example of an extinction that has been witnessed by humans?
a. Dodo bird
b. Cheetahs
c. Dinosaurs
d. Bacteria
Name and discuss a source of error in performing and evaluating gel electrophoresis
Answer:
Contamination of a sample
Explanation:
Gel electrophoresis is a method used in molecular biology for DNA analysis. This method includes the separation of DNA fragments through the gel according to their size or shape.
One of the major source of error is contamination of the DNA sample. This refers to the presence of foreign DNA in the sample of interest. As a consequence, the gel will have more bands.
Another errors might appear as a result of wrong concentration of the gel, wrong buffer pH, high/low concentration of dye etc.
Answer:
Contamination of a Sample
Explanation:
Organic matter is essential in soil for it to be able to produce vegetation. What roles do organic matter play in making soil viable? Select all that apply. 1Points A aerating the soil B hydrating the soil C preventing pest infestation D providing nutrients through excrement and dead tissue
Organic matter in soil helps in aerating the soil, retaining water, and providing nutrients through the decomposition of dead tissue and waste material. However, it does not directly contribute to pest prevention.
Explanation:Organic matter plays several crucial roles in fostering a rich, productive soil environment. Some of these roles include:
Aerating the soil: Organic matter helps to improve the soil's structure by creating space for air and water, which is essential for plant roots and soil organisms. Hydrating the soil: Organic materials absorb water like a sponge, thus retaining it in the soil. This capacity helps plants access water during dry periods. Providing nutrients through excrement and dead tissue: As organic matter decomposes, it releases nutrients into the soil, which can then be taken up by plants. This makes organic matter a vital component of the soil nutrient cycle.
However, it's important to note that organic matter does not directly prevent pest infestations. Pest control is often related to a diversity of plant species, utilization of natural predators, and other strategies.
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Choose from the following the requirements for an electric current.
an insulating material through which to travel
a conduction path
a source of energy
cold temperatures
I think the answer would a source of energy which would be answer C
What is the largest artery in the human body
This is a tiny fluid-filled cavity in the cytoplasm. It can be used for storage of biochemicals.
Answer:
Vacuole
Explanation:
Vacuole is an membrane-bound organelle of the plants (some animals, fungi and some bacteria). This fluid-filled organelle contains organic and inorganic molecules, some of them are stored while others are phagocytized and ready for the excretion. One of the most important function of the plant vacuole is the water storage. Filled with water, vacuole can create turgor pressure which can shape the cell and give it a straight.
Answer:
vacuole
Explanation:
When a zygote divides into separate cells it is called
The answer is embryo