If Ribonucleotides Were Depleted from a Cell During S Phase

question 2

Multiple Choice

If ribonucleotides were depleted from a cell during S phase, how would DNA synthesis be affected? (Ignore energetic considerations.)

• A) There would be no effect because ribonucleotides are used in RNA synthesis, not DNA synthesis.
• B) DNA synthesis would continue but at a slower rate.
• C) There would only be an effect during M phase, not in S phase.
• D) DNA synthesis would not be affected because ribonucleotides are only used during the process of transcription.
• E) Replication would cease because ribonucleotides are required to initiate DNA synthesis.

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