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if an dna molecule is compared to a spiral staircase, what parts make up the steps.
A)pairs of nitrogen bases.
B)sugar and nitrogen base.
C)sugar and phosphate.
D)pairs of sugars.

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chrysanthemum
Hello!

In this comparison, the "steps" of the DNA staircase would consists of the pairs of nitrogen bases, which are Adenine, Guanine, Cytosine, and Thymine.

Answer:

Option A, pairs of nitrogen bases

Explanation:

The helical structure of DNA if compared to the spiral staircase then, the following structure of spiral staircase will resemble to the following parts of DNA -

a) The spiral staircase's hand rail will be equivalent to the sugar phosphate base of DNA that holds the nitrogenous base

b) The steps of spiral case will be equivalent to the pair of nitrogenous base

Nitrogenous base pair include

- Pair of adenine (A) and thymine (T)

- Pair of guanine (G) and cytosine (C)

Thus, option A is correct

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