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photoshop1234 [79]
3 years ago
13

Veins have a much lower blood pressure than arteries. Which of these prevents backflow of blood in veins?

Biology
2 answers:
posledela3 years ago
5 0
I Think it would be B One-way valves in veins
Crank3 years ago
3 0

Answer:

B. one–way valves in veins

Explanation:

Veins are thin-walled blood vessels as compared to the arteries. The veins are superficially located under the skin in the body. They bring deoxygenated blood to the heart form the body cells. Since the blood pressure in the veins is low, the presence of valves along their length to prevent backflow of blood away from the heart.

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The length of linker DNA segments varies somewhat among organisms. The length of the linker DNA in sea urchin is 110 base pairs.
nasty-shy [4]

Answer:

362 nucleosomes

Explanation:

A nucleosome repeat is made up of the DNA (146 bp) wrapped around the core nucleosome particle and the linker DNA (110 bp as in this situation). We can conclude that, every repeat stands for 256 (146 + 110) base pairs of DNA.

We are given the length of the entire region to be 92,672 bp long,

To determine the number of nucleosomes to organize the region into the 10nm fiber structure

Let,

Number of nucleosomes =

the length of the entire region

------------------- -----

base pairs of DNA.

= 92,672

-------

256

= 362 nucleosomes

Therefore, 362 nucleosomes is needed to structure the region into the 10nm fiber structure.

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Answer:

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