JEE Main · Chemistry

Biomolecules and polymers

24 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 24 questions

  1. Why is sucrose classified as a non-reducing disaccharide sugar?
  2. The spontaneous change in the specific optical rotation of a freshly prepared aqueous solution of an optically active sugar until it reaches a constant equilibrium value is known as:
  3. What type of glycosidic linkage connects the repeating -D-glucose units in the linear structural polysaccharide cellulose?
  4. Which of the following amino acids is optically INACTIVE because its -carbon is achiral (bonded to two identical hydrogen atoms)?
  5. In an aqueous solution at its characteristic isoelectric point (pI), an -amino acid exists predominantly as which electrical species?
  6. Which level of protein structural organization remains COMPLETELY intact and undamaged when a globular protein is subjected to chemical or thermal denaturation?
  7. In the double-helical structure of B-DNA proposed by Watson and Crick, which specific pairing of nitrogenous bases occurs between complementary strands, and how many hydrogen bonds stabilize each pair…
  8. Which of the following nitrogenous bases is present in RNA but completely absent in DNA?
  9. Which of the following vitamins is a water-soluble vitamin that cannot be stored in the human body and must be regularly supplied in the daily diet?
  10. The deficiency disease scurvy, characterized by bleeding gums, skin hemorrhages, and delayed wound healing, is caused by a severe deficiency of which vitamin?
  11. What are the two monomeric building blocks used in the industrial condensation polymerization to manufacture Nylon-6,6?
  12. What is the monomeric chemical unit of natural rubber, and what is its geometric stereochemical configuration?
  13. What chemical process is carried out during the vulcanization of natural rubber to improve its physical elasticity and mechanical durability?
  14. Bakelite, an early synthetic thermosetting plastic, is manufactured by the step-growth condensation polymerization of which two monomers?
  15. Which of the following polymers is an addition homopolymer derived from tetrafluoroethene and widely used for non-stick cookware coatings?
  16. Which of the following copolymers is a commercial biodegradable polymer synthesized from 3-hydroxybutanoic acid and 3-hydroxypentanoic acid?
  17. What are the structural monomer components of the synthetic rubber Buna-S?
  18. How many chiral (asymmetric) carbon atoms are present in the open-chain form of D-glucose ()?
  19. What is the repeating monomer unit of the synthetic fiber Orlon (Acrilan)?
  20. In the -helical secondary structure of proteins, how is the helical backbone stabilized?
  21. Which of the following compounds is an example of an essential amino acid that cannot be synthesized endogenously by the human body and must be acquired through food?
  22. What is the chemical composition of a nucleoside in nucleic acid biochemistry?
  23. Which of the following polymers is a thermosetting polymer that cannot be remolded or reused upon heating?
  24. During the acid-catalyzed hydrolysis of cane sugar (sucrose), the optical rotation changes from dextrorotatory () to laevorotatory (). What is the resulting equimolar mixture…

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