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:

Identify the nitrogenous bases in DNA

DNA (deoxyribonucleic acid) contains four nitrogenous bases: adenine (A), thymine (T), guanine (G), and cytosine (C).

Evaluate the given options

• Option 1 contains uracil, which is found in RNA, not DNA.
• Option 2 contains uracil, which is found in RNA, not DNA.
• Option 3 contains glycine, which is an amino acid, not a nucleic acid base.
• Option 4 correctly lists adenine, thymine, guanine, and cytosine.

Answer:

• thymine, guanine, cytosine, uracil
• guanine, cytosine, uracil, adenine
• cytosine, glycine, adenine, thymine
• adenine, thymine, guanine, cytosine (Correct answer)