NEET UG · Biology

Biomolecules and Enzymes

27 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 27 questions

  1. In competitive enzyme inhibition, how do the Michaelis constant () and the maximum velocity () change in the presence of the inhibitor?
  2. Which classic example illustrates competitive inhibition of an enzyme by a substrate analog?
  3. According to the B-DNA structural model described by Watson and Crick, what are the pitch of the helix and the distance between two successive base pairs?
  4. Which of the following nitrogenous bases is a double-ring purine derivative found in both DNA and RNA?
  5. Why does cellulose fail to give a blue color with iodine solution, whereas starch produces an intense blue complex?
  6. Lecithin, an essential component of the alveolar surfactant and cellular membranes, is classified chemically as a:
  7. A non-protein chemical component that is tightly and permanently bound to the apoenzyme to constitute a functional holoenzyme is designated as a:
  8. What does a low Michaelis constant () signify regarding an enzyme's interaction with its substrate?
  9. Which of the following carbohydrates is a non-reducing disaccharide that yields D-glucose and D-fructose upon enzymatic hydrolysis?
  10. Which of the following is an essential amino acid that must be obtained through the human diet because the body cannot synthesize it?
  11. At its specific isoelectric point (pI), an amino acid exists in which ionization state?
  12. What type of bond stabilizes the secondary structure (-helix and -pleated sheet) of globular proteins?
  13. Adult human hemoglobin () is a classic example of quaternary protein structure composed of:
  14. A ribozyme is defined as:
  15. In a polynucleotide chain of DNA, which chemical linkage joins adjacent deoxynucleotide units together?
  16. Inulin, a storage polysaccharide found in the roots of Dahlias and chicory, is a polymer of:
  17. Feedback inhibition (end-product inhibition) in a multi-step metabolic pathway is typically mediated by:
  18. Which protein is the most abundant protein in the entire biosphere?
  19. Which of the following fatty acids is a polyunsaturated fatty acid (PUFA) containing 20 carbon atoms and four double bonds?
  20. In non-competitive enzyme inhibition, how are the parameters and affected by the presence of a reversible non-competitive inhibitor?
  21. According to the International Union of Biochemistry and Molecular Biology (IUBMB), enzymes that catalyze the joining of two molecules coupled with the hydrolysis of ATP belong to which class?
  22. Which level of protein structural organization is NOT destroyed when a native globular protein is thermally denatured?
  23. Which of the following organic compounds is a nucleoside containing the nitrogenous base uracil?
  24. Which enzyme cofactor is an inorganic zinc ion () tightly coordinated to three histidine residues in the active site?
  25. How do biological enzyme catalysts increase the rate of chemical reactions?
  26. Which of the following bonds is cleaved during the hydrolysis of glycogen or starch into maltose?
  27. Which secondary metabolite derived from plants is classified as an alkaloid and used as a potent pain reliever?

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