Biomolecules Chapter-Wise Test 8

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following bonds stabilizes the tertiary structure of proteins?

Peptide bond
Disulfide bond
Phosphodiester bond
Glycosidic bond
2

Disulfide bonds between cysteine residues help stabilize the tertiary structure of proteins.

Which of the following statements about proteins is incorrect?

Proteins are made of amino acids linked by peptide bonds.
Proteins can act as enzymes, structural components, and hormones.
Proteins store genetic information.
The structure of a protein determines its function.
3

Proteins do not store genetic information; that role belongs to nucleic acids.

Which of the following elements is a major component of nucleic acids but is not found in carbohydrates?

Carbon
Oxygen
Nitrogen
Hydrogen
3

Nitrogen is a key component of nucleic acids (DNA & RNA) but is absent in carbohydrates.

Which polysaccharide is found in bacterial cell walls?

Cellulose
Chitin
Peptidoglycan
Hyaluronic acid
3

Peptidoglycan is a structural component of bacterial cell walls.

Which of the following statements about enzyme inhibition is correct?

Competitive inhibitors bind to the enzyme's active site.
Non-competitive inhibitors bind to the active site of the enzyme.
All enzyme inhibition is irreversible.
Enzyme inhibitors always increase enzyme activity.
1

Competitive inhibitors compete with the substrate by binding to the active site. Non-competitive inhibitors bind elsewhere, and some inhibitors are reversible.

Which of the following components is found in lecithin, a major phospholipid?

Cholesterol
Glycerol
Phosphate group
Fatty acids
3

Lecithin is a phospholipid containing a phosphate group, essential for cell membrane structure.

Which of the following statements about polysaccharides is correct?

Glycogen is more highly branched than starch.
Cellulose is a storage polysaccharide in animals.
Starch is a polymer of fructose.
Chitin is found only in plants.
1

Glycogen has more branches than starch. Cellulose is structural, starch is a polymer of glucose, and chitin is found in fungi and arthropods.

Which of the following statements about enzyme inhibitors is incorrect?

Competitive inhibitors bind to the enzyme's active site.
Non-competitive inhibitors bind to a site other than the active site.
All enzyme inhibitors permanently deactivate enzymes.
Enzyme inhibitors can be reversible or irreversible.
3

Not all enzyme inhibitors permanently deactivate enzymes; some are reversible.

Which macromolecule forms the major component of the fungal cell wall?

Cellulose
Chitin
Peptidoglycan
Lignin
2

Chitin is a structural polysaccharide found in the fungal cell wall and the exoskeleton of arthropods.

Which of the following statements about carbohydrates is correct?

Carbohydrates store and provide energy.
Cellulose is a storage carbohydrate in humans.
Carbohydrates contain nitrogen as a primary element.
Starch is a polymer of ribose.
1

Carbohydrates serve as an energy source. Cellulose is structural, not a storage carbohydrate, and starch is a polymer of glucose, not ribose.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0