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Chapter 9: Biomolecules

NCERT Solutions for CBSE Class 10 Biology — 34 solved questions with detailed explanations.

34

Questions

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Topics

Solved Questions

Q1. The building blocks of proteins are:

Nucleotides
Amino acids
Fatty acids
Monosaccharides

Difficulty: Easy · Topic: Proteins

Solution

Proteins are polymers of amino acids linked by peptide bonds.

Q2. Enzymes are mostly:

Carbohydrates
Lipids
Proteins
Nucleic acids

Difficulty: Easy · Topic: Enzymes

Solution

Enzymes are biological catalysts, predominantly proteins (except ribozymes which are RNA).

Q3. The DNA nucleotide bases are:

A, U, G, C
A, T, G, C
A, T, G, U
A, T, C, U

Difficulty: Easy · Topic: Nucleic Acids

Solution

DNA bases: Adenine, Thymine, Guanine, Cytosine. RNA has Uracil instead of Thymine.

Q4. Saturated fatty acids have:

multiple double bonds
no double bonds
triple bonds
one double bond

Difficulty: Easy · Topic: Biomolecules

Solution

no double bonds.

Q5. Cellulose is a:

polysaccharide
monosaccharide
lipid
disaccharide

Difficulty: Easy · Topic: Biomolecules

Solution

polysaccharide.

Q6. Lactose is a disaccharide of:

fructose + galactose
glucose + glucose
glucose + fructose
glucose + galactose

Difficulty: Easy · Topic: Biomolecules

Solution

glucose + galactose.

Q7. Maltose is a disaccharide of:

glucose + galactose
glucose + fructose
glucose + glucose
fructose + fructose

Difficulty: Easy · Topic: Biomolecules

Solution

glucose + glucose.

Q8. Glycogen is stored in:

brain
kidneys
blood
liver and muscles

Difficulty: Easy · Topic: Biomolecules

Solution

liver and muscles.

Q9. Chitin is found in:

blood
animal bones
exoskeleton of arthropods
plant cell wall

Difficulty: Easy · Topic: Biomolecules

Solution

exoskeleton of arthropods.

Q10. Phospholipids are major components of:

ribosomes
cell walls
chromosomes
cell membranes

Difficulty: Easy · Topic: Biomolecules

Solution

cell membranes.

Q11. Cofactors that are organic are called:

metal ions
prosthetic groups
substrates
coenzymes

Difficulty: Easy · Topic: Biomolecules

Solution

coenzymes.

Q12. Starch is:

polymer of α-glucose
polymer of fructose
polymer of galactose
polymer of β-glucose

Difficulty: Easy · Topic: Biomolecules

Solution

Starch: polymer of α-glucose.

Q13. Cellulose is:

polymer of α-glucose
polymer of fructose
protein
polymer of β-glucose

Difficulty: Easy · Topic: Biomolecules

Solution

Cellulose: polymer of β-glucose.

Q14. Glycogen is:

animal storage polysaccharide
plant polysaccharide
disaccharide
monosaccharide

Difficulty: Easy · Topic: Biomolecules

Solution

Glycogen: animal storage polysaccharide.

Q15. Chitin is:

glucose polymer
fructose polymer
N-acetylglucosamine polymer
amino acid polymer

Difficulty: Easy · Topic: Biomolecules

Solution

Chitin: N-acetylglucosamine polymer.

Q16. DNA is:

protein
deoxyribose + phosphate + ATGC bases
ribose + AUGC
lipid

Difficulty: Easy · Topic: Biomolecules

Solution

DNA: deoxyribose + phosphate + ATGC bases.

Q17. RNA is:

lipid
protein
ribose + phosphate + AUGC bases
deoxyribose + ATGC

Difficulty: Easy · Topic: Biomolecules

Solution

RNA: ribose + phosphate + AUGC bases.

Q18. Hemoglobin is:

zinc protein
calcium protein
iron-containing protein in RBCs
copper protein

Difficulty: Easy · Topic: Biomolecules

Solution

Hemoglobin: iron-containing protein in RBCs.

Q19. Keratin is:

hormone
transport protein
structural protein of hair/nails
enzyme

Difficulty: Easy · Topic: Biomolecules

Solution

Keratin: structural protein of hair/nails.

Q20. Collagen is:

transport protein
structural protein of connective tissue
hormone
enzyme

Difficulty: Easy · Topic: Biomolecules

Solution

Collagen: structural protein of connective tissue.

Q21. Insulin is:

enzyme
peptide hormone (51 amino acids)
structural protein
steroid hormone

Difficulty: Easy · Topic: Biomolecules

Solution

Insulin: peptide hormone (51 amino acids).

Q22. Primary metabolites are:

toxins
drugs
essential for normal growth (amino acids, sugars)
pigments

Difficulty: Easy · Topic: Biomolecules

Solution

essential for normal growth (amino acids, sugars).

Q23. Secondary metabolites include:

fatty acids
alkaloids, flavonoids, terpenes
sugars
amino acids

Difficulty: Easy · Topic: Biomolecules

Solution

alkaloids, flavonoids, terpenes.

Q24. Enzymes are classified into:

10 classes
3 classes
6 major classes
2 classes

Difficulty: Easy · Topic: Biomolecules

Solution

6 major classes.

Q25. Lock and key model was proposed by:

Crick
Koshland
Emil Fischer
Watson

Difficulty: Easy · Topic: Biomolecules

Solution

Emil Fischer.

Q26. Induced fit model was proposed by:

Pauling
Koshland
Fischer
Beadle

Difficulty: Easy · Topic: Biomolecules

Solution

Koshland.

Q27. Km (Michaelis constant) represents:

minimum velocity
maximum velocity
substrate concentration at half Vmax
enzyme concentration

Difficulty: Easy · Topic: Biomolecules

Solution

substrate concentration at half Vmax.

Q28. Allosteric enzymes have:

only active site
no regulatory site
regulatory sites separate from active site
identical sites

Difficulty: Easy · Topic: Biomolecules

Solution

regulatory sites separate from active site.

Q29. Zymogen is an:

prosthetic group
coenzyme
inactive enzyme precursor
active enzyme

Difficulty: Easy · Topic: Biomolecules

Solution

inactive enzyme precursor.

Q30. Ribozymes are:

lipid enzymes
DNA enzymes
protein enzymes
RNA with catalytic activity

Difficulty: Easy · Topic: Biomolecules

Solution

RNA with catalytic activity.

Q31. Abzymes are:

hormones
enzymes
antigens
antibodies with catalytic activity

Difficulty: Easy · Topic: Biomolecules

Solution

antibodies with catalytic activity.

Q32. Lipids are soluble in:

acids
bases
water
organic solvents

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

organic solvents.

Q33. The primary structure of protein is:

quaternary structure
alpha helix
sequence of amino acids
denatured form

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

sequence of amino acids.

Q34. Competitive inhibition of enzyme is overcome by:

decreasing temperature
adding more inhibitor
increasing substrate concentration
increasing enzyme

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

increasing substrate concentration.

Other Chapters in Biology

Ch 1: The Living World Ch 2: Biological Classification Ch 3: Plant Kingdom Ch 4: Animal Kingdom Ch 5: Morphology of Plants Ch 6: Anatomy of Plants Ch 7: Structural Organisation in Animals Ch 8: Cell Unit of Life Ch 10: Cell Cycle Ch 11: Transport in Plants Ch 12: Mineral Nutrition Ch 13: Photosynthesis Ch 14: Respiration in Plants Ch 15: Plant Growth Ch 16: Digestion & Absorption Ch 17: Breathing & Gas Exchange Ch 18: Body Fluids & Circulation Ch 19: Excretory Products Ch 20: Locomotion & Movement Ch 21: Neural Control Ch 22: Chemical Coordination

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