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CXC · CSEC · Biology

Enzymes – Structure, Function and Factors Affecting Activity
Practice Questions

20 CXC CSEC Biology questions on Enzymes – Structure, Function and Factors Affecting Activity, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Enzymes – Structure, Function and Factors Affecting Activity

Question 1 · 1 mark · Difficulty 1/3

Which term describes the specific region on an enzyme where the substrate binds?

  1. A. Allosteric site
  2. B. Active site
  3. C. Binding groove
  4. D. Reaction centre
Show answer & explanation
✓ Answer: BB. Active site
The active site is the specific region on an enzyme molecule that is complementary in shape to the substrate. It is here that enzyme-substrate complexes form and catalysis occurs. The allosteric site is a different regulatory region found on some enzymes.
Question 2 · 1 mark · Difficulty 2/3

A student increases the concentration of substrate in a reaction mixture containing a fixed amount of enzyme. What happens to the rate of reaction once all active sites are occupied?

  1. A. The rate continues to increase indefinitely
  2. B. The rate drops sharply to zero
  3. C. The rate levels off and remains constant
  4. D. The rate increases then decreases
Show answer & explanation
✓ Answer: CC. The rate levels off and remains constant
When all active sites of available enzyme molecules are occupied (enzyme saturation), adding more substrate cannot increase the rate further. The rate plateaus at the maximum velocity (Vmax) for that enzyme concentration. The rate only drops if an inhibitor or denaturing condition is introduced.
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CXC CSEC Biology: Enzymes – Structure, Function and Factors Affecting Activity FAQ

How many CXC CSEC Biology questions on Enzymes – Structure, Function and Factors Affecting Activity are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Enzymes – Structure, Function and Factors Affecting Activity for CXC CSEC Biology, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CXC paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CXC CSEC students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Enzymes – Structure, Function and Factors Affecting Activity practice with other Biology topics or even switch to a totally different CXC subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Enzymes – Structure, Function and Factors Affecting Activity questions aligned to the official CXC CSEC Biology syllabus?
Every question is written against the published CXC CSEC Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CXC.
How is Enzymes – Structure, Function and Factors Affecting Activity typically tested on CXC CSEC Biology papers?
Enzymes – Structure, Function and Factors Affecting Activity appears across multiple question types on real CXC CSEC Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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