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Edexcel · GCSE · Chemistry

Amino acids and proteins
Practice Questions

20 Edexcel GCSE Chemistry questions on Amino acids and proteins, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Amino acids and proteins

Question 1 · 1 mark · Difficulty 1/3

Which functional groups are present in every amino acid molecule?

  1. A carboxyl group (–COOH) and a sulfhydryl group (–SH)
  2. An amino group (–NH₂) and a hydroxyl group (–OH)
  3. A hydroxyl group (–OH) and a carboxyl group (–COOH)
  4. An amino group (–NH₂) and a carboxyl group (–COOH)
Show answer & explanation
✓ Answer: DAn amino group (–NH₂) and a carboxyl group (–COOH)
Every amino acid contains both an amino group (–NH₂) and a carboxyl group (–COOH) attached to the same central carbon atom. A hydroxyl group is found in some amino acids but is not universal. A sulfhydryl group is only present in cysteine, not all amino acids.
Question 2 · 1 mark · Difficulty 1/3

Which statement best describes a dipeptide?

  1. A molecule made of two amino acids joined by a peptide bond
  2. A molecule made of two identical amino acids only
  3. A molecule formed when a protein is fully broken down
  4. A molecule made of two amino acids joined by a hydrogen bond
Show answer & explanation
✓ Answer: AA molecule made of two amino acids joined by a peptide bond
A dipeptide is specifically two amino acids joined by a single peptide bond formed via a condensation reaction. Hydrogen bonds stabilise protein shape but do not link amino acids in the primary structure. The two amino acids in a dipeptide may be the same or different. A fully broken-down protein yields individual amino acids, not dipeptides.
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Edexcel GCSE Chemistry: Amino acids and proteins FAQ

How many Edexcel GCSE Chemistry questions on Amino acids and proteins are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Amino acids and proteins for Edexcel GCSE Chemistry, 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 Edexcel 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 Edexcel GCSE students preparing for Chemistry?
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 Amino acids and proteins practice with other Chemistry topics or even switch to a totally different Edexcel 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 Amino acids and proteins questions aligned to the official Edexcel GCSE Chemistry syllabus?
Every question is written against the published Edexcel GCSE Chemistry specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real Edexcel 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 Edexcel.
How is Amino acids and proteins typically tested on Edexcel GCSE Chemistry papers?
Amino acids and proteins appears across multiple question types on real Edexcel GCSE Chemistry 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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