If the hypothesis that protocells were based on an "RNA world" is correct,which would NOT be necessary to shift to a "DNA world"?
A)an enzyme or reaction capable of converting ribose to deoxyribose in nucleotides
B)enzymes for reverse transcription of RNA into DNA
C)new enzymes to replicate the DNA
D)new enzymes for transcribing DNA back to RNA
E)the presence of oxygen

Question

Quizplus · Accepted Answer

The presence of oxygen is not necessary for the shift from an RNA world to a DNA world, as this change likely occurred before the evolution of oxygenic photosynthesis. The other options are necessary for the shift to a DNA world, as deoxyribose is required for DNA, reverse transcription is necessary to generate DNA from RNA, and new enzymes are needed for DNA replication and transcription.

If the Hypothesis That Protocells Were Based on an "RNA