Question

List two major differences between RNA and DNA at the level of the nucleotide.

a) Presence of uracil in RNA, presence of thymine in DNA
b) RNA is single-stranded, DNA is double-stranded
c) Deoxyribose in RNA, ribose in DNA
d) Both a and b

Answer 1

The major differences between RNA and DNA at the level of the nucleotide are the presence of uracil in RNA and thymine in DNA, as well as the single-stranded nature of RNA and the double-stranded nature of DNA.

Step-by-step explanation:

The major differences between RNA and DNA at the level of the nucleotide are:

1. Presence of uracil in RNA, presence of thymine in DNA: RNA contains the nitrogenous base uracil (U), while DNA contains thymine (T). This difference in bases is due to the replacement of thymine with uracil in RNA.
2. RNA is single-stranded, DNA is double-stranded: RNA is typically found as a single-stranded molecule, while DNA forms a double helix structure with two complementary strands.