Question

which bases are found in a strand of dna?
thymine, guanine, cytosine, uracil
guanine, cytosine, uracil, adenine
cytosine, glycine, adenine, thymine
adenine, thymine, guanine, cytosine

Explanation:

DNA (deoxyribonucleic acid) has four nitrogen - containing bases. Adenine (A) pairs with thymine (T) through two hydrogen bonds, and guanine (G) pairs with cytosine (C) through three hydrogen bonds. Uracil (U) is found in RNA (ribonucleic acid), not DNA. Glycine is an amino acid, not a nitrogen - base in DNA.

Answer:

adenine, thymine, guanine, cytosine