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Class 12 Chemistry (NCERT)

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Ch-10: Biomolecules 12 Questions

Before You Practice

Try each question on your own first. Use the Show Answer button only after you have selected your option, then read the explanation and revise the related concept from your chapter notes.

1. Carbohydrates that cannot be hydrolyzed further into simpler polyhydroxy compounds are called:

  • A. Monosaccharides
  • B. Disaccharides
  • C. Polysaccharides
  • D. Oligosaccharides

2. In which disaccharide are glucose and fructose linked together through a glycosidic bond?

  • A. Sucrose
  • B. Maltose
  • C. Lactose
  • D. Starch

3. Proteins are essentially polymers built from monomer units of:

  • A. Amino acids
  • B. Glucose units
  • C. Fatty acids
  • D. Nucleotides

4. The secondary structure of a protein mainly refers to:

  • A. Regular structural patterns such as the α-helix and β-pleated sheet
  • B. The linear sequence of amino acids
  • C. The overall three-dimensional folding of the whole chain
  • D. The aggregation of multiple protein subunits

5. Denaturation of a protein primarily leads to the loss of its:

  • A. Biological activity, due to disruption of secondary and tertiary structure
  • B. Primary structure (amino acid sequence)
  • C. Molecular formula
  • D. Amino acid composition

6. A key structural difference between DNA and RNA is that DNA contains the sugar:

  • A. Deoxyribose
  • B. Ribose
  • C. Glucose
  • D. Fructose

7. Which nitrogenous base is found in DNA but is replaced by a different base in RNA?

  • A. Thymine
  • B. Cytosine
  • C. Adenine
  • D. Guanine

8. A deficiency of which vitamin causes the disease scurvy?

  • A. Vitamin C
  • B. Vitamin A
  • C. Vitamin D
  • D. Vitamin B12

9. Enzymes are best described as:

  • A. Biological catalysts, mostly made of protein
  • B. Simple carbohydrates
  • C. Nucleic acids
  • D. Lipid molecules

10. The zwitterionic form of an amino acid arises because it contains:

  • A. Both a basic -NH2 group and an acidic -COOH group
  • B. Only a -COOH group
  • C. Only an -NH2 group
  • D. No ionizable functional groups

11. Amino acids are joined together in a protein chain through:

  • A. Peptide bonds
  • B. Glycosidic bonds
  • C. Phosphodiester bonds
  • D. Hydrogen bonds alone

12. Insulin, which regulates blood glucose levels, is an example of a:

  • A. Protein hormone
  • B. Carbohydrate
  • C. Nucleic acid
  • D. Vitamin
Ch-1: Solutions Ch-2: Electrochemistry Ch-3: Chemical Kinetics Ch-4: The d- and f- Block Elements Ch-5: Coordination Compounds Ch-6: Haloalkanes and Haloarenes Ch-7: Alcohols, Phenols and Ethers Ch-8: Aldehydes, Ketones and Carboxylic Acids Ch-9: Amines