Which set lists the nitrogenous bases mentioned?

Which set lists the nitrogenous bases mentioned?

• A. Adenine, guanine, cytosine, thymine, uracil
• B. Adenine, thymine, ribose, deoxyribose
• C. Glucose, fructose, ribose
• D. Adenine, cytosine, magnesium, phosphate

Answer: (A)

Nitrogenous bases are the letters of genetic information found in DNA and RNA. In DNA the bases are adenine, guanine, cytosine, and thymine. In RNA, thymine is replaced by uracil, so the bases are adenine, guanine, cytosine, and uracil. A set that includes all five—adenine, guanine, cytosine, thymine, and uracil—covers the bases used by both DNA and RNA. The other options mix in sugars like ribose or deoxyribose, or minerals such as magnesium or phosphate, which are not bases themselves. So the correct set is the one listing adenine, guanine, cytosine, thymine, and uracil.

Nitrogenous bases are the letters of genetic information found in DNA and RNA. In DNA the bases are adenine, guanine, cytosine, and thymine. In RNA, thymine is replaced by uracil, so the bases are adenine, guanine, cytosine, and uracil. A set that includes all five—adenine, guanine, cytosine, thymine, and uracil—covers the bases used by both DNA and RNA. The other options mix in sugars like ribose or deoxyribose, or minerals such as magnesium or phosphate, which are not bases themselves. So the correct set is the one listing adenine, guanine, cytosine, thymine, and uracil.