Question

1. adenine, cytosine, guanine, and thymine are

a. amino acids
b. fatty acids
c. simple sugars
d. nitrogenous bases
e. alleles

Explanation:

Adenine, cytosine, guanine, and thymine are components of DNA. They are nitrogen - containing compounds known as nitrogenous bases. Amino acids are building blocks of proteins, fatty acids are part of lipids, simple sugars are carbohydrates, and alleles are alternative forms of a gene.

Answer:

D. nitrogenous bases