The figure below is a nucleotide:
- If you were told that this molecule could be found in either DNA or RNA,depending on the identity of the chem groups labeled X)and Y),the nitrogen- containing ring structure would have to be ______.
A)guanine
B)uracil
C)cytosine
D)thymine
E)adenine

Question

The figure below is a nucleotide: 
- If you were told that this molecule could be found in either DNA or RNA,depending on the identity of the chem groups labeled X)and Y),the nitrogen- containing ring structure would have to be ______.
A)guanine 
B)uracil 
C)cytosine 
D)thymine 
E)adenine

Quizplus · Accepted Answer

Cytosine is present in both DNA and RNA, while thymine is only present in DNA and uracil is only present in RNA. Adenine and guanine are found in both DNA and RNA. Therefore, cytosine is the best choice as the nitrogen-containing ring structure in the given nucleotide.

The Figure Below Is a Nucleotide