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zlopas [31]
3 years ago
7

Please help I’m getting timed

Biology
1 answer:
Natasha2012 [34]3 years ago
6 0

Answer:

if a answer is virus or some sort of bacteria, the thata it

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Which of the letters above best models a molecule of water moving into the membrane via an aquaporin?​
nika2105 [10]

Answer:

Letter B.

Explanation:

Aquaporins, also known as "water channels," are the main transport of water through the membranes of plant, animal, and bacterial cells. These channels allow the water to travel into and within cells and, at the same time, exclude the passage of ions and solutes.

What makes letter B the correct answer, is the form of transport and shape of the channel that allow water according to the osmotic gradient. In this model, letter A shows simple diffusion, while C and D seem to illustrate gated channels.

3 0
3 years ago
Before replication can take place.(1) A. DNA polymerases must add complementary nucleotides to DNA. B. the two strands of DNA mu
andriy [413]

Answer:

The correct answer is B. the two strands of DNA must separate.

Explanation:

DNA is a double-stranded structure. The two strands are joined together by the formation of hydrogen bonds between complementary nucleotides. So before the replication takes place these two strands must be separated.

The separation of DNA strand is accomplished by the action of a helicase enzyme which breaks the hydrogen bond between complementary nucleotides and separated the two DNA strands.  

After separation, the DNA polymerase binds to separated DNA and replicating the DNA. So the right answer is B.

4 0
3 years ago
What does one cell become in mitosis?<br> and <br> what does one cell become in meiosis?
Romashka [77]

One cell produces two genetically identical daughter cells is both mitosis and meiosis.

5 0
3 years ago
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PLEASE HELP ME ITS DUE TODAY PLEASE YOU DONT HAVE TO AWNSER THEM ALL
dybincka [34]

Answer:

1 = A

2 = B

3 =  B

Explanation:

1) Black holes occur when really big stars collapse on themselves. And, in order to get big, the star has to be an old one.

2) A black hole is something huge that swallows up everything, while a protostar is just the very beginning of a star.

3) Scientist can't truly know for sure, but they can infer about them due to the effects of the surrounding areas.

7 0
3 years ago
What is meant by the term “essential” amino acids, what is essential about them? Put in your own words
sergey [27]
Amino acids make up proteins, and proteins are needed for proper growth in humans. They’re essential because, without them we wouldn’t have the nutrients we need to survive. I hope this helped!
5 0
2 years ago
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