Macromolecules

Macromolecules MDCAT MCQs with answers

29 past paper MCQs from Chemistry unit 19, Macromolecules, across 3 topics. They are arranged topic by topic; bigger topics show a sample here and link to their full set and to study notes. Tap “Show answer” for the correct option and a short solution.

Practise as a quiz

Classification of Proteins

1.Which one of the following is not an amino acid? (MDCAT 2024)

  1. lactic acid
  2. glutamic acid
  3. glycine
  4. lysine
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Correct answer: (a) lactic acid

Lactic acid carries a hydroxyl group where an amino acid carries an amino group.

2.The most abundant protein in animal kingdom forming 25–35% of body proteins is/are: (NUMS MDCAT 2025)

  1. Derived proteins
  2. Simple proteins
  3. Compound proteins
  4. Conjugated proteins
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Correct answer: (b) Simple proteins

Simple proteins yield only amino acids on hydrolysis, and they are the commonest kind in animals.

3.Which one of the following is not an amino acid (UHS MDCAT 2024)

  1. Folic acid
  2. Glutamic acid
  3. Glycine
  4. Lysine
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Correct answer: (a) Folic acid

Folic acid is a vitamin; the other three are amino acids.

All 13 Classification of Proteins MCQs → Classification of Proteins notes →

Importance of Proteins

4.Which of the following proteins acts as a carrier of copper in blood plasma? (MDCAT 2022)

  1. haemoglobin
  2. glycoprotein
  3. ceruloplasmin
  4. histone
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Correct answer: (c) ceruloplasmin

Ceruloplasmin carries most of the copper of the plasma.

5.After digestion and before absorption, the products of proteins are: (MDCAT 2023)

  1. amino acids and small polypeptides
  2. only amino acids
  3. only small polypeptides
  4. polysaccharides
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Correct answer: (a) amino acids and small polypeptides

Proteases cut proteins down to amino acids and short peptides, and both are taken up by the intestinal wall.

6.Protein present in connective tissues of human body is: (NUMS MDCAT 2025)

  1. Phosphoprotein
  2. Collagen
  3. Lecithin
  4. Cholesterol
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Correct answer: (b) Collagen

Collagen is the fibrous protein of tendon, ligament, skin and bone.

All 11 Importance of Proteins MCQs → Importance of Proteins notes →

Enzymes as Biocatalysts

7.Which of the following enzymes is raised in rickets? (MDCAT 2020)

  1. lactic dehydrogenase
  2. alkaline phosphatase
  3. amylase
  4. lipase
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Correct answer: (b) alkaline phosphatase

Bone turnover is high in rickets, and the osteoblasts release alkaline phosphatase into the blood.

8.When food reaches the stomach, the action of which enzyme comes to an end because of the acidic pH? (MDCAT 2022)

  1. lipase
  2. amylase
  3. maltase
  4. hydrolases
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Correct answer: (b) amylase

Salivary amylase works near neutral pH and is denatured by the acid of the stomach.

9.Inhibitors stop an enzyme from working by: (MDCAT 2023)

  1. changing the shape of the enzyme
  2. merging with the substrate instead
  3. blocking the active site of the enzyme
  4. combining with the product of the reaction
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Correct answer: (c) blocking the active site of the enzyme

A competitive inhibitor occupies the active site, so the substrate cannot bind there.

All 5 Enzymes as Biocatalysts MCQs → Enzymes as Biocatalysts notes →

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