Question

7 which of the following nitrogen base is found in rna but not in dna? a thymine b adenine c cytosine d uracil

Explanation:

To solve this, we recall the nitrogenous bases in DNA and RNA. DNA has adenine (A), thymine (T), cytosine (C), and guanine (G). RNA has adenine (A), uracil (U), cytosine (C), and guanine (G). So uracil is in RNA but not DNA. Thymine is in DNA, not RNA. Adenine and cytosine are in both.

Answer:

D. Uracil