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Cambridge IGCSE Biology practice

What determines the sequence of amino acids in a protein?

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Show answerChromosomes, genes and proteins revisionRevise the key idea

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cambridge_mcq

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Chromosomes, genes and proteins

Exam-style question

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What determines the sequence of amino acids in a protein?.

  1. A.The sequence of bases in the mRNA
  2. B.The shape of the ribosome
  3. C.The amount of mRNA produced
  4. D.The location of the gene

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Paper 4 structured question: Chromosomes, genes and proteins

Paper 4Theory (Extended)3 marks

Description

Protein Synthesis Process

The gene remains in the nucleus. A copy of the gene called mRNA is produced in the nucleus. The mRNA moves to the cytoplasm and passes through ribosomes. Ribosomes assemble amino acids into proteins, with the amino acid sequence determined by the mRNA base sequence.

  1. a

    State where the gene remains during protein synthesis.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Explain how ribosomes use mRNA to assemble proteins.

    Aim for approximately 2 distinct marking points.

    [2]