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Macromolecules MCQs for MDCAT Practice

Chemistry section, Macromolecules chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 844 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    All are enzymes involved in fermentation process except one:
    • Zymase
    • Invertase
    • Lipase (correct answer)
    • Diastase
    Correct answer: C
    Identify enzymes crucial for fermentation, distinguishing them from those involved in lipid metabolism.
  2. Question 2
    The spiral coiling of polypeptide chains in a protein molecule represent its:
    • Tertiary structure
    • Primary structure
    • Secondary structure (correct answer)
    • Quaternary structure
    Correct answer: C
    Proteins exhibit hierarchical structures: primary (sequence), secondary (coils/sheets), tertiary (3D fold), and quaternary (subunit assembly). This question tests understanding of secondary structure.
  3. Question 3
    C25H31-COO-C16H33 is the formula of:
    • Spermaceti
    • Bee wax (correct answer)
    • Glycerol
    • Choline acid
    • Pepsinogen
    Correct answer: B
    This question tests the identification of common waxes based on their chemical formula, specifically distinguishing between fatty acid esters.
  4. Question 4
    Trypsinogen can be activated by the action of:
    • Amylase
    • HCl
    • Glucokinase
    • Entrokinase (correct answer)
    Correct answer: D
    Trypsinogen, a pancreatic zymogen, requires enteropeptidase from the duodenum for its initial activation into active trypsin.
  5. Question 5
    Which of the following statements is incorrect regarding linseed oil?
    • It is a drying oil
    • It is used in paints and varnishes
    • It is a vegetable oil
    • All of these are correct (correct answer)
    Correct answer: D
    Linseed oil's properties as a drying oil, its use in paints, and its vegetable origin are all correct statements, making option D the incorrect choice.
  6. Question 6
    In which of the following disaccharides both the basic structural units are the same?
    • Lactose
    • Maltose (correct answer)
    • Sucrose
    • All of the above
    Correct answer: B
    Identify the disaccharide composed of identical monosaccharide units by recalling their hydrolysis products. Maltose is unique among common disaccharides for this.
  7. Question 7
    Which enzyme is used to catalyze the addition of ammonia, water or carbon dioxide to double bond
    • Phospho-transferase
    • Phospho-glyceromutases
    • Fumarase (correct answer)
    • Succinic thiokinase
    Correct answer: C
    Fumarase catalyzes the addition of water (hydration) to fumarate, a key step in the citric acid cycle. Other enzymes have distinct roles.
  8. Question 8
    The lipids which have ___ compounds are called steroids
    • benzene
    • cyclopentane
    • phenanthrene
    • tetracyclic (correct answer)
    Correct answer: D
    Steroids are lipids characterized by a specific four-ring structure, distinguishing them from other lipid classes.

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Read the full Macromolecules chapter notes: Macromolecules notes. Or browse every chapter.