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A Levels Biology (9700)•9700/12/M/J/24
Question 7 from 9700/12/M/J/24

Explanation

Evaluating Statements on Peptide Bond Formation

Steps:

  • Statement 1 correctly identifies the peptide bond as forming between the carboxyl carbon of one amino acid and the amino nitrogen of the next, creating a covalent amide linkage.
  • Statement 2 accurately describes the site and context: peptide bonds form via peptidyl transferase at the ribosome during translation, with amino acids esterified to tRNA molecules.
  • Statement 3 incorrectly labels the process as hydrolysis, which adds water to break bonds; formation is actually condensation (dehydration synthesis), removing water, so the statement is false overall.
  • Since only statements 1 and 2 are correct, but no option lists them together, the question options are incomplete.

Why no option is fully correct:

  • Options assume combinations including the flawed statement 3 or exclude statement 1.

Final answer: 1 and 2 (not listed)

Topic: Protein synthesis

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