NeetVictoryQuestion 1: Carbohydrates and Proteins
Deficiency of vitamin D causes:
- A night blindness
- B scurvy
- C rickets
- D beri-beri
Answer: C. rickets
Why: Vitamin D helps absorption of calcium; a lack of it softens the bones in children.
NEET Chemistry: Biomolecules. Chapter-wise Practice Questions and Test
Biomolecules is a Class 12 Chemistry chapter that carries about 2.7% of the Chemistry questions in NEET. Practise it with 41 questions covering 2 topics, each with an explanation.
Practise Biomolecules
Open in the appSets of 15 questions that adapt to your level, with an explanation for every answer.
Topics covered in Biomolecules
- Carbohydrates and Proteins (31 questions)
- Nucleic Acids (10 questions)
How often Biomolecules has come up in NEET
Across the 13 previous year papers, Biomolecules had 19 questions, about 1.5 a year. The most in one paper was 2, in AIPMT 2014.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 1 |
| NEET 2025 | 2 |
| NEET 2024 | 2 |
| NEET 2023 | 1 |
| NEET 2022 | 2 |
| NEET 2021 | 1 |
| NEET 2020 | 2 |
| NEET 2019 | 1 |
| NEET 2018 | 2 |
| NEET 2017 | 1 |
| NEET 2016 | 2 |
| Re-AIPMT 2015 | 0 |
| AIPMT 2014 | 2 |
Sample questions on Biomolecules with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 2: Nucleic Acids
The nucleotides in a nucleic acid are linked by:
- A peptide bonds
- B hydrogen bonds
- C glycosidic bonds only
- D phosphodiester bonds between the 3′ and 5′ carbons of the sugars
Answer: D. phosphodiester bonds between the 3′ and 5′ carbons of the sugars
Why: The sequence of bases determines the genetic information.
Question 3: Carbohydrates and Proteins
Starch and cellulose are both polysaccharides made of glucose units, but they differ in:
- A the type of glycosidic linkage between glucose units
- B their basic monomer unit
- C their elemental composition
- D having different molecular formulas for glucose
Answer: A. the type of glycosidic linkage between glucose units
Why: Starch consists of glucose units linked by α-glycosidic bonds, while cellulose has β-glycosidic linkages — this structural difference gives them very different properties despite sharing the same monomer.
Question 4: Nucleic Acids
A nucleotide consists of:
- A a sugar and a phosphate only
- B a nitrogenous base, a pentose sugar and a phosphate group
- C a base and a sugar only
- D an amino acid and a phosphate
Answer: B. a nitrogenous base, a pentose sugar and a phosphate group
Why: A nucleoside is the base plus sugar; adding a phosphate group gives a nucleotide.
Question 5: Carbohydrates and Proteins
Beri-beri is caused by a deficiency of:
- A vitamin K
- B vitamin B₁ (thiamine)
- C vitamin B₁₂
- D vitamin E
Answer: B. vitamin B₁ (thiamine)
Why: Vitamin B₁₂ deficiency causes pernicious anaemia.
Question 6: Nucleic Acids
The backbone of a DNA strand is composed of alternating:
- A nitrogenous bases and amino acids
- B sugar and phosphate groups
- C fatty acids and glycerol
- D amino acids only
Answer: B. sugar and phosphate groups
Why: The DNA backbone consists of alternating deoxyribose sugar and phosphate groups, linked by phosphodiester bonds, with nitrogenous bases attached to each sugar.
Question 7: Carbohydrates and Proteins
Glucose has how many chiral carbon atoms in its open-chain form?
- A 5
- B 4
- C 3
- D 6
Answer: B. 4
Why: C-2, C-3, C-4 and C-5 are chiral.
Question 8: Nucleic Acids
The base pairing in DNA follows the rule that adenine pairs with ___ and guanine pairs with ___.
- A thymine; cytosine
- B cytosine; thymine
- C uracil; cytosine
- D guanine; adenine
Answer: A. thymine; cytosine
Why: In DNA, adenine (A) pairs with thymine (T) via two hydrogen bonds, and guanine (G) pairs with cytosine (C) via three hydrogen bonds (Chargaff's base-pairing rules).
Practise all of Biomolecules
Open in the appFrequently asked questions
How many questions come from Biomolecules in NEET?
Biomolecules carries about 2.7% of the Chemistry questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 19 times, about 1.5 questions a year.
Which class is Biomolecules from?
Biomolecules is a Class 12 Chemistry chapter in the NCERT syllabus.
Where can I practise Biomolecules questions for NEET?
NeetVictory has 41 practice questions on Biomolecules, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.