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Chapter 14: Biomolecules

NCERT Solutions for CBSE Class 10 Chemistry — 12 solved questions with detailed explanations.

12

Questions

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Topics

Solved Questions

Q1. Sucrose on hydrolysis gives:

Two glucose
Glucose + Fructose
Two fructose
Glucose + Galactose

Difficulty: Easy · Topic: Carbohydrates

Solution

Sucrose (C₁₂H₂₂O₁₁) hydrolyzes to α-D-glucose + β-D-fructose. This mixture is called invert sugar.

Q2. The secondary structure of proteins includes:

α-helix and β-pleated sheet
Primary sequence
Quaternary structure
Denaturation

Difficulty: Easy · Topic: Proteins

Solution

Secondary structure: α-helix (hydrogen bonds between C=O and N-H of same chain) and β-sheet (between adjacent chains).

Q3. DNA contains the sugar:

Ribose
Deoxyribose
Glucose
Fructose

Difficulty: Easy · Topic: Nucleic Acids

Solution

DNA = Deoxyribonucleic acid. Contains 2-deoxyribose sugar. RNA contains ribose.

Q4. Starch is a polymer of:

β-glucose
α-glucose
fructose
galactose

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

α-glucose.

Q5. Cellulose is a polymer of:

fructose
sucrose
α-glucose
β-glucose

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

β-glucose.

Q6. Amino acids are linked by:

glycosidic bonds
ester bonds
peptide bonds
hydrogen bonds

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

peptide bonds.

Q7. Essential amino acids:

are synthesized by body
are non-protein
cannot be synthesized by body
are not needed

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

cannot be synthesized by body.

Q8. DNA double helix has:

A-C and G-T pairs
random pairing
A-T and G-C base pairs
A-G and T-C pairs

Difficulty: Easy-Medium · Topic: Biomolecules

Solution

A-T and G-C base pairs.

Q9. Biuret test is used to detect:

Proteins (peptide bonds)
Nucleic acids
Lipids
Carbohydrates

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Biuret test detects Proteins (peptide bonds).

Q10. Molisch test is used to detect:

Proteins
Carbohydrates
Nucleic acids
Lipids

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Molisch test detects Carbohydrates.

Q11. Benedict's test is used to detect:

Lipids
Reducing sugars
Proteins
Non-reducing sugars

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Benedict's test detects Reducing sugars.

Q12. Ninhydrin test is used to detect:

Sugars
DNA
Lipids
Amino acids

Difficulty: Easy-Medium · Topic: Chemical Tests

Solution

Ninhydrin test detects Amino acids.

Other Chapters in Chemistry

Ch 1: Solid State Ch 2: Solutions Ch 3: Electrochemistry Ch 4: Chemical Kinetics Ch 5: Surface Chemistry Ch 6: Isolation of Elements Ch 7: p-Block Elements Ch 8: d & f Block Elements Ch 9: Coordination Compounds Ch 10: Haloalkanes & Haloarenes Ch 11: Alcohols Phenols Ethers Ch 12: Aldehydes Ketones Ch 13: Amines Ch 15: Polymers Ch 16: Chemistry in Everyday Life

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