What are the bases for DNA?

What are the bases for DNA?

• A. Adenine (A), Uracil (U), Cytosine (C), Guanine (G)
• B. Adenine (A), Thymine (T), Cytosine (C), Guanine (G)
• C. Adenine (A), Thymine (T), Uracil (U), Guanine (G)
• D. Adenine (A), Cytosine (C), Guanine (G), Uracil (U)

Answer: (B)

DNA is built from four nucleobases: adenine, thymine, cytosine, and guanine. These bases pair in a stable way—adenine with thymine and cytosine with guanine—forming the rungs of the DNA double helix. Uracil, on the other hand, is used in RNA in place of thymine. That’s why thymine belongs to the DNA base set, while uracil is found in RNA. Any set that includes uracil as a DNA base would not be correct, and omitting thymine would also be incorrect. Therefore, the bases that make up DNA are adenine, thymine, cytosine, and guanine.

DNA is built from four nucleobases: adenine, thymine, cytosine, and guanine. These bases pair in a stable way—adenine with thymine and cytosine with guanine—forming the rungs of the DNA double helix. Uracil, on the other hand, is used in RNA in place of thymine. That’s why thymine belongs to the DNA base set, while uracil is found in RNA. Any set that includes uracil as a DNA base would not be correct, and omitting thymine would also be incorrect. Therefore, the bases that make up DNA are adenine, thymine, cytosine, and guanine.