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A Levels Biology (9700)•9700/12/M/J/21
Question 3 from 9700/12/M/J/21

Explanation

Base Pairing in Transcription

Steps:

  • RNA polymerase synthesizes mRNA complementary to the DNA template strand during transcription.
  • Base pairing rules: RNA A pairs with DNA T; RNA U pairs with DNA A; RNA G with DNA C; RNA C with DNA G.
  • Translation involves mRNA-tRNA pairing, not direct RNA-DNA pairing.
  • Choices C and D are missing, making full evaluation impossible.

Why C is correct:

  • Not enough information; choice C is blank and cannot be assessed.

Why the others are wrong:

  • A: Incorrect process timing; RNA A pairs with DNA T in transcription, but choice specifies wrong context or detail unclear without full options.
  • B: Translation does not involve RNA-DNA pairing; it uses codon-anticodon matching between mRNA and tRNA.

Final answer: C

Topic: Protein synthesis

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