A Levels Biology (9700)•9700/11/M/J/19
Explanation
tRNA's Role in Protein Translation
Steps:
- Identify statement 1: Describes anticodon-codon hydrogen bonding, which temporarily pairs tRNA with mRNA during translation.
- Evaluate statement 2: mRNA codons are complementary to tRNA anticodons, not identical, so sequences differ.
- Assess statement 3: tRNA decodes mRNA codons by delivering matching amino acids to form polypeptide chains.
- Select option matching true statements: 1 and 3 are accurate, excluding 2.
Why C is correct:
- C includes only statements 1 and 3, aligning with tRNA's binding via hydrogen bonds and its function in converting mRNA sequences to amino acids per the genetic code.
Why the others are wrong:
- A: Includes false statement 2 about sequence identity.
- B: Includes false statement 2 and excludes true statement 3.
- D: Excludes true statement 1 about hydrogen bonding.
Final answer: C
Topic: Protein synthesis
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