Question

‘One species’ DNA differs from others in its ______.

Options

• phosphate groups

• base sequence

• sugars

• all of these

Answer 1

‘One species’ DNA differs from others in its base sequence.

Explanation:

DNA from different species has the same basic chemical backbone, alternating deoxyribose sugars and phosphate groups, but varies in the order (sequence) of the four nitrogenous bases (A, T, G, C). That base sequence is what encodes species-specific genetic information.