OCR A Level Biology B (Advancing Biology)
OCR A Level Biology B (Advancing Biology) Proteins and Enzymes Exam Questions
Free OCR A Level Biology B (Advancing Biology) exam questions on Proteins and Enzymes, with mark schemes. Covers amino acids, protein structure, enzyme action, kinetics and inhibition.
Proteins and Enzymes exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Biology Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About OCR A Level Biology B (Advancing Biology) Proteins and Enzymes
This topic covers proteins and how enzymes work.
What you need to know
- Protein structure Primary to quaternary, with bonds holding each level.
- Enzyme action Induced fit and lowering activation energy.
- Factors Temperature, pH, substrate and enzyme concentration.
- Inhibition Competitive and non-competitive inhibitors; cofactors.
Common mistakes in Proteins and Enzymes
- Saying enzymes are killed by heat.
- Confusing competitive and non-competitive inhibition.
- Forgetting Vmax.
Try three Proteins and Enzymes exam-style questions
1. Explain why high temperature reduces enzyme activity. (2 marks)
Show the mark scheme answer
Bonds in tertiary structure break (1), changing the active site shape so substrate no longer fits (1).
2. State the effect of a competitive inhibitor at high substrate concentration. (1 mark)
Show the mark scheme answer
Its effect is reduced.
3. Name the bond joining amino acids. (1 mark)
Show the mark scheme answer
Peptide bond.
Proteins and Enzymes FAQs
What does Proteins and Enzymes cover?
Protein structure, enzyme action and inhibition.
Which practical links here?
Investigating factors affecting enzyme rate.
What is a cofactor?
A non-protein substance needed for enzyme activity.
Revise this topic with flashcards: A Level Biology Flashcards, with mark scheme answers for Anki and Quizlet.
