BIOLOGY HIGH SCHOOL

Gigantic mammals (mammoths, giant sloths, etc.) characterize these times.a. Pleistocene,
b. Holocene,
c. Pliocene,
d. Cretaceous

Answers

Answer 1
Answer: The answer is a. Pleistocene.

A group of large animals that lived during the Pleistocene is called Pleistocene megafauna. This group included mammoths, giant sloths, mastodons, cave bears, saber-toothed cats, etc. The extinction of these animals happened also in Pleistocene. The reasons for their extinction could be hunting by the humans, climate changes, or impact of asteroides.

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which statement best explains the distinction between the roles that dna ligase and restriction enzymes perform in a dna cloning experiment?

Answers

The correct answer for the question that is being presented above is this one: "D.) DNA ligase generates recombinant DNA by joining two different DNA molecules, while restriction enzymes convert long stretches of double-stranded DNA into two single-stranded DNA molecules."

Here are the following choices:
A.) DNA ligase generates hydrogen bonds between complementary base pairs, while restriction enzymes break those bonds.
B.) DNA ligase has a specific DNA recognition sequence, while restriction enzymes do not.
C.) DNA ligase generates the covalent bonds of the phosphodiester backbone, while restriction enzymes break those bonds.
D.) DNA ligase generates recombinant DNA by joining two different DNA molecules, while restriction enzymes convert long stretches of double-stranded DNA into two single-stranded DNA molecules.

Genetic variation can aid in the survival of species when the environment changes. Which of the following is the best example of an organism with a genetic variation that could improve survival chances over time? A)
An ant that is resistant to pesticide .


B)
A cactus that has no spines.



C)
A mouse that has learned to avoid mousetraps.

Answers

An example of an organism with a genetic variation that could improve survival chances over time would be an ant that is resistant to pesticides (Option A)

What is genetic variation?

Genetic variation refers to differences in the genetic material (DNA) among individuals within a species. This can arise due to several mechanisms, including mutation, recombination, and genetic drift. Genetic variation provides the basis for evolution by natural selection, as it allows for populations to adapt to changing environments and helps to ensure the survival of the species over time.

Genetic variation can also play a role in disease resistance, as some individuals may carry genetic variations that protect them from certain diseases. Additionally, genetic variation can impact physical and behavioral traits, such as eye color, height, and intelligence.

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Nope. A is a correct answer. A mouse simply learns how to avoid a trap, there is no genetic change responsible for that

Diffusion of water across a membrane from areas of higher concentration to areas of lower concentration is called

Answers

Since Osmosis is the diffusion of water across a membrane from areas of lower concentration to areas of higher concentration, Reverse Osmosis would be the diffusion of water across a membrane from areas of higher concentration to areas of lower concentration.

What is the main function of the respiratory system?Select one:
a. Supply oxygen to cells for cellular respiration
b. Circulate blood through the blood vessels
c. Rid the blood of water and metabolic wastes
d. Decrease moisture stored in the blood and lungs

Answers

The respiratory system's primary job is to provide cells with oxygen so they may respire. This procedure entails absorbing oxygen from the atmosphere, delivering it to the body's cells, and exhaling carbon dioxide as waste.

What is the requirement of the cells ?

The cells utilise the oxygen to produce ATP (adenosine triphosphate), which is a kind of energy. The cells then use this energy to perform a variety of tasks. The body's blood circulation is aided by the respiratory system.

It achieves this by assisting in the pumping of oxygen-rich blood to the rest of the body through the diaphragm. By doing this, it is possible to guarantee that the body's cells get enough oxygen. Finally, the respiratory system helps rid the metabolic wastes and a body of water.

Carbon dioxide, a waste product of cellular respiration, is exhaled to accomplish this. This enables the body to operate effectively by preserving thae right balance of water and metabolic wastes. In conclusion, the respiratory system's primary job is to provide cells with oxygen so they may respire.

Additionally, it aids in blood circulation throughout the body and removes water and metabolic wastes.  

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Answer:

Supply oxygen to cells for cellular respiration.

Explanation:

took the test

Which of the following is a food chain in the food web shown in the figure below?

Answers

First we have to understand that a food chain is a series of steps in which organisms transfer energy by eating and being eaten. A food web is a feeding relationship among the various organisms in an ecosystem that forms a network of complex interactions. A food web links all the food chains in an ecosystem.



Answer: Grass, Grasshopper, Snake, Hawk.


I hope this helps, Regards.

Answer:

Lesson 3: Movement of Energy in Ecosystems

Explanation:

1. B. grass,grasshopper,snake hawk

2. D. eliminated as heat

3. C. river

4. A. Biomass at the fourth trophic level is approximately ten times smaller than biomass at the trophic level.

What damage does UV cause which makes it effective in killing bacteria?

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