Question

20.

Answer 1

Answer:

D. Sugars and phosphates

Explanation:

DNA or deoxyribonucleic acid which is a self-replicating material present in nearly all organisms and the constituent of chromosomes, It is also the carrier of the basic instructions of life!

We have a total of 23 chromosomes in our cells!

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Answer 2

Answer:

Sugars and phosphates  

Explanation:

DNA is deoxyribonucleic acid.

The backbone is based on a repeated pattern of a sugar group (deoxyribose) and a phosphate group.  

The image below shows one straightened-out strand of DNA with a backbone of alternating sugars and phosphates.

A is wrong. There is no ribose in DNA.

B is wrong. The nucleic acids A, C, G, and T join one strand of DNA to the other.

C is wrong. There is no RNA in DNA.