NeetVictoryQuestion 1: Carbohydrates and Nucleic Acids
Glucose and fructose are linked to form sucrose by a:
- A peptide bond
- B hydrogen bond
- C glycosidic bond
- D phosphodiester bond
Answer: C. glycosidic bond
Why: It is a disaccharide.
NEET Biology: Biomolecules. Chapter-wise Practice Questions and Test
Biomolecules is a Class 11 Biology chapter that carries about 3.6% of the Biology questions in NEET. Practise it with 65 questions covering 3 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 Nucleic Acids (24 questions)
- Enzymes and their Mechanism (25 questions)
- Structure of Proteins (16 questions)
How often Biomolecules has come up in NEET
Across the 13 previous year papers, Biomolecules had 41 questions, about 3.2 a year. The most in one paper was 6, in NEET 2020.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 5 |
| NEET 2025 | 4 |
| NEET 2024 | 4 |
| NEET 2023 | 1 |
| NEET 2022 | 3 |
| NEET 2021 | 3 |
| NEET 2020 | 6 |
| NEET 2019 | 3 |
| NEET 2018 | 2 |
| NEET 2017 | 2 |
| NEET 2016 | 3 |
| Re-AIPMT 2015 | 3 |
| 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: Enzymes and their Mechanism
The enzymes catalysing the inter-conversion of the optical, geometric or positional isomers are:
- A lyases
- B isomerases
- C hydrolases
- D ligases
Answer: B. isomerases
Why: For example, the phosphoglucomutase.
Question 3: Structure of Proteins
The tertiary structure of a protein refers to:
- A the order of the amino acids
- B the three-dimensional folding of the polypeptide chain, which gives the molecule its functional shape
- C the linear arrangement of the subunits
- D a helix only
Answer: B. the three-dimensional folding of the polypeptide chain, which gives the molecule its functional shape
Why: It is stabilised by the bonds between the R groups.
Question 4: Carbohydrates and Nucleic Acids
Which element is a regular component of the nucleic acids but not of the proteins?
- A hydrogen
- B phosphorus
- C carbon
- D nitrogen
Answer: B. phosphorus
Why: Proteins may contain sulphur, but not phosphorus as a regular part.
Question 5: Enzymes and their Mechanism
The energy required to bring the substrate to the transition state is the:
- A potential energy
- B thermal energy
- C free energy
- D activation energy, which the enzyme lowers
Answer: D. activation energy, which the enzyme lowers
Why: The enzyme does not change the equilibrium.
Question 6: Structure of Proteins
At its isoelectric point, an amino acid exists as a:
- A zwitterion, with no net charge
- B free radical
- C cation
- D anion
Answer: A. zwitterion, with no net charge
Why: It carries both a positive (–NH₃⁺) and a negative (–COO⁻) charge, which cancel.
Question 7: Carbohydrates and Nucleic Acids
A fatty acid has a carboxyl group attached to:
- A a nitrogen base
- B a sugar
- C an R group, which may be a methyl (–CH₃), ethyl (–C₂H₅) or a higher group of 1 to 19 carbons
- D a phosphate group
Answer: C. an R group, which may be a methyl (–CH₃), ethyl (–C₂H₅) or a higher group of 1 to 19 carbons
Why: Palmitic acid has 16 carbons including the carboxyl carbon.
Question 8: Enzymes and their Mechanism
If the temperature is raised from 0 to the optimum, the enzyme activity:
- A does not change
- B decreases
- C stops
- D increases
Answer: D. increases
Why: At very high temperature the enzyme is denatured.
Practise all of Biomolecules
Open in the appFrequently asked questions
How many questions come from Biomolecules in NEET?
Biomolecules carries about 3.6% of the Biology questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 41 times, about 3.2 questions a year.
Which class is Biomolecules from?
Biomolecules is a Class 11 Biology chapter in the NCERT syllabus.
Where can I practise Biomolecules questions for NEET?
NeetVictory has 65 practice questions on Biomolecules, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.