객관식
Which type of sugar is found in RNA nucleotides?
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7. DNA and Chromosome Structure
RNA
객관식
In standard cellular RNA, how many different nitrogenous bases are used?
A
4 (adenine, thymine, cytosine, and guanine)
B
5 (adenine, uracil, cytosine, guanine, and thymine)
C
3 (adenine, cytosine, and guanine)
D
4 (adenine, uracil, cytosine, and guanine)
검증된 단계별 안내1
Recall that RNA is a nucleic acid composed of nucleotides, each containing a nitrogenous base, a sugar, and a phosphate group.
Identify the four standard nitrogenous bases found in RNA: adenine (A), uracil (U), cytosine (C), and guanine (G).
Note that thymine (T) is found in DNA, not RNA, so it is not counted among RNA bases.
Understand that the presence of uracil instead of thymine is a key difference between RNA and DNA nitrogenous bases.
Conclude that the number of different nitrogenous bases in standard cellular RNA is four: adenine, uracil, cytosine, and guanine.
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