Biology

The correct answer is D. DNA contains thymine while RNA contains uracil.

The differences between DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are numerous, but one key distinction is the bases they contain. Both DNA and RNA are composed of nucleotides, which consist of a sugar molecule, a phosphate group, and a nitrogenous base.

In DNA, the four nitrogenous bases are adenine (A), cytosine (C), guanine (G), and thymine (T). Adenine pairs with thymine, and cytosine pairs with guanine in DNA, forming complementary base pairs.

In RNA, however, the nitrogenous base thymine (T) is replaced by uracil (U). The four bases in RNA are adenine (A), cytosine (C), guanine (G), and uracil (U). Adenine pairs with uracil in RNA, and cytosine pairs with guanine.

Option A, stating that RNA is double-stranded while DNA is single-stranded, is incorrect. DNA is typically doubl...