Which of the following best describes cytosine?
A. pyrimidine, present in RNA and DNA
B. pyrimidine, present only in DNA
C. purine, present only in RNA
D. purine, present in RNA and DNA
Answer:A
Which of the following best describes cytosine?
A. pyrimidine, present in RNA and DNA B. pyrimidine, present only in DNA C. purine, present only in RNA D. purine, present in RNA and DNA