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CXC CAPE · · Biology

DNA structure and replication
Practice Questions

40 CXC CAPE Biology questions on DNA structure and replication, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for DNA structure and replication.

Try 2 sample questions on DNA structure and replication

Question 1 · 1 mark · Difficulty 1/3

Which three components make up a single nucleotide?

  1. A pentose sugar, a phosphate group and a nitrogenous base
  2. A hexose sugar, a phosphate group and an amino acid
  3. A pentose sugar, a fatty acid and a base
  4. Two bases and a phosphate group
Show answer & explanation
✓ Answer: AA pentose sugar, a phosphate group and a nitrogenous base
Award 1 mark. They are joined by condensation reactions within the nucleotide.
Question 2 · 1 mark · Difficulty 1/3

Which bases are purines?

  1. Thymine and cytosine
  2. Adenine and guanine
  3. Adenine and thymine
  4. Cytosine and guanine
Show answer & explanation
✓ Answer: BAdenine and guanine
Award 1 mark. They have a double ring structure, while the pyrimidines thymine and cytosine have a single ring.
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CXC CAPE Biology: DNA structure and replication FAQ

Is Kramizo free for CXC CAPE 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 DNA structure and replication practice with other Biology topics or even switch to a totally different CXC CAPE 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 DNA structure and replication questions aligned to the official CXC CAPE Biology syllabus?
Every question is written against the published CXC CAPE 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 CAPE 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 CAPE.
How is DNA structure and replication typically tested on CXC CAPE Biology papers?
DNA structure and replication appears across multiple question types on real CXC CAPE 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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