Question

2
what are the four possible nitrogenous bases in dna?
a adenine, uracil, guanine, cytosine
b carbon, hydrogen, oxygen, nitrogen
c methionine, tyrosine, leucine, alanine
d adenine, thymine, guanine, cytosine

Explanation:

• Option A: Uracil is found in RNA, not DNA.
• Option B: Carbon, Hydrogen, Oxygen, Nitrogen are elements, not nitrogenous bases.
• Option C: Methionine, Tyrosine, Leucine, Alanine are amino acids, not nitrogenous bases.
• Option D: Adenine, Thymine, Guanine, Cytosine are the four nitrogenous bases in DNA. Adenine pairs with Thymine (\(A - T\)) and Guanine pairs with Cytosine (\(G - C\)) through hydrogen bonds.

Answer:

D. Adenine, Thymine, Guanine, Cytosine