Question

20.

What makes up the backbone of a DNA molecule?

ribose and deoxyribose

nucleic acids

RNA molecules

sugars and phosphates

Answer 1

D. Sugars and phosphates

Step-by-step 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

Sugars and phosphates

Step-by-step 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.