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MCQ Questions Biomolecules Organic Chemistry Chapter 14 Class 12

NCERT Organic Chemistry Class 12 MCQ Practice Questions for Jee Mains | NEET | School Exams.

Prepare these important MCQ Questions of Biomolecules in organic chemistry, Latest questions to expect in Jee Mains | NEET | School Exams.

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1. Most common oligosaccharides are:

1. Trisaccharides

2. Monosaccharides

3. Disaccharides

4. Tetrasaccharides


2. Find incorrect Statement.

1. Reducing sugar, reduces Fehling’s reagent as well as Tollen’s reagent.

2. The most common sugar, used in our homes is sucrose.

3. Glucose occurs in free as well as combined state in nature.

4. Ribose is five carbon ketose sugar.


3. Pyran and Pyrone are respectively:

1. Both Aromatic

2. Non-aromatic and Aromatic

3. Antiaromatic

4. Aromatic and Non-aromatic


4. Most commonly encountered carbohydrates in nature:

1. Monosaccharides

2. Disaccharides

3. Polysaccharides

4. Trisaccharides


5. Find the incorrect statement regarding proteins:

1. They occur in every part of our body.

2. They are required for growth of body.

3. All proteins are polymers of α-amino acids.

4. Word ‘Protein’ is derived from latin word, ‘proteios’.


6. State True or False (T/F):

a. Protein found in biological system with a unique 3-D structure is called native protein.
b. Almost all enzymes are globular proteins.
c. All amino-acids have L-configurations.

1. TTF

2. FTF

3. TTT

4. TFT


7. Vitamins are considered essential food factors because:

1. Our body cannot synthesize most of vitamins.

2. They are vital amines which are not synthesized in our body.

3. They are required by bacteria of our gut.

4. Both (1) & (2)


8. Increased fragility of RBC’s is due to deficiency of which Vitamin:

a. Vit B₁₂

b. Vit E

c. Vit B₉

d. Vit C


9. Which of the following doesn’t form Zwitterion.

1. Sulphanilic acid

2. Glutamic acid

3. P-amino benzoic acid

4. Glycine


10. Read the following statements & choose the correct answer:

a. DNA fingerprinting is preffered over conventional fingerprinting.
b. DNA is same for every cell and cannot be altered by any known treatment.

1. Both (A) & (B) are correct and (B) is correct reason of (A).

2. Both (A) & (B) are correct and (B) is not correct reason of (A).

3. Only A is correct.

4. Both (A) & (B) are incorrect.


11. Select the incorrect match:

1. Glycine : Sweet taste.

2. Lysine : 6 – Carbon Amino acid.

3. Aspartic acid : Most acidic amino acid.

4. Glutamine : Represented by ‘E’.


12. Histidine consists of:

1. Indole ring

2. Furan ring

3. Imidiazole ring

4. Pyran ring


13. Positive Ceric Ammonium nitrate test is given by:

1. Serine

2. Methionine

3. Threonine

4. Both (1) & (3)


14. Most basic amino acid is:

1. Ornithine

2. Lysine

3. Arginine

4. Histidine


15. Major form of glucose in solution form is:

1. β – glucose.

2. α – glucose.

3. Open Chain structure.

4. Both α & β in equal proportion.


16. Choose the correct difference between Saccharic acid and Saccharin.

1. Both contain equal no. of carbon atoms.

2. Both are acyclic compounds.

3. Both are derived from D – glucose.

4. Both of them have at least 2 oxygen atoms.


17. Rhamnose, a carbohydrate has formula:

1. C₆H₁₀O₆

2. C₆H₁₂O₆

3. C₆H₁₂O₅

4. C₅H₁₂O₆


18. What is the product P in the reaction:

1. Xanthine

2. Thymine

3. Cytosine

4. Uracil


19. Which of the following sugar is found in RNA.

1. α – Ribose

2. β – Ribose

3. α – Deoxyribose

4. Openchain Ribose


20. How many of the following amino-acids have more than one nitrogen atom?

Alanine, Histidine, Proline, Tyrosine, Tryptophan, Lysine.

a. 2

b. 5

c. 4

d. 3