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AS & A Level · AS/A Level

Biology

Enzymes, membranes and genetics

Name: ____________________Date: October 10, 2026
  1. 1.

    Explain why a competitive inhibitor increases apparent Km but does not change Vmax in an enzyme-catalysed reaction.

    [3 marks] · no calculator
  2. 2.

    Contrast facilitated diffusion and active transport across a cell membrane.

    [3 marks] · no calculator
  3. 3.

    Two heterozygous parents (Aa x Aa) have a child. A recessive condition appears only in aa. Calculate the probability of an affected child and explain why an unaffected child can still carry the allele.

    [3 marks] · no calculator

Original, unofficial practice questions from SubjectScout — not official past-paper questions.

Marking points are indicative, not an official mark scheme. Accept equivalent valid methods and supported interpretations that address the task; award each mark once without requiring the model wording.