Top Biomolecules Questions for NEET
Biomolecules is one of the most important and memory-based chapters in NEET Chemistry. Questions are directly picked from NCERT lines, structures, and functions of carbohydrates, proteins, enzymes, vitamins, and nucleic acids. Mastering the Top 5 Biomolecules Questions can easily help you secure full marks from this chapter.
Why Biomolecules is Important for NEET
Biomolecules is a high-scoring and low-effort chapter. NEET questions are mostly direct, NCERT-based, and conceptual rather than numerical. By practicing the Top 5 Biomolecules Questions, you can quickly revise key topics like amino acids, enzymes, and carbohydrates, which are repeatedly tested.
Top 5 Biomolecules Questions (Most Repeated PYQs)
Question 1: Reducing Sugars
Which of the following is a reducing sugar?
A. Sucrose
B. Maltose
C. Starch
D. Cellulose
Answer: B
Explanation:
Maltose is a reducing sugar because it has a free aldehyde group. Sucrose is non-reducing as both anomeric carbons are involved in glycosidic bonding. This is one of the most frequently asked Top 5 Biomolecules Questions.
Question 2: Amino Acids Structure
Which functional groups are present in amino acids?
A. –OH and –CHO
B. –COOH and –NH₂
C. –COOH and –OH
D. –NH₂ and –CHO
Answer: B
Explanation:
All amino acids contain both a carboxyl group (–COOH) and an amino group (–NH₂). This is a basic NCERT concept commonly tested in Top 5 Biomolecules Questions.
Question 3: Enzyme Activity
Which factor does NOT affect enzyme activity?
A. Temperature
B. pH
C. Substrate concentration
D. Light
Answer: D
Explanation:
Enzyme activity depends on temperature, pH, and substrate concentration. Light generally does not affect enzyme activity. This is a conceptual question often included in Top 5 Biomolecules Questions.
Question 4: Protein Structure
Which structure of protein is determined by hydrogen bonding?
A. Primary
B. Secondary
C. Tertiary
D. Quaternary
Answer: B
Explanation:
Secondary structure (α-helix and β-pleated sheet) is stabilized by hydrogen bonding. This is a frequently repeated concept in Top 5 Biomolecules Questions.
Question 5: Vitamins
Which vitamin is water-soluble?
A. Vitamin A
B. Vitamin D
C. Vitamin E
D. Vitamin C
Answer: D
Explanation:
Vitamin C and B-complex vitamins are water-soluble, whereas A, D, E, and K are fat-soluble. This is a direct NCERT-based question from the Top 5 Biomolecules Questions.
Key Concepts You Must Remember
To master the Top 5 Biomolecules Questions, focus on classification and properties of carbohydrates (reducing vs non-reducing sugars), structure of proteins, enzyme mechanisms, and vitamins. Memorizing NCERT tables and examples is crucial for scoring well in this chapter.
Additional Practice Questions (Concept-Based Rapid Revision)
Question 6
Which carbohydrate is stored in animals?
Answer: Glycogen
Question 7
What type of bond links amino acids?
Answer: Peptide bond
Question 8
Which enzyme breaks down starch?
Answer: Amylase
Question 9
Which nucleic acid contains uracil?
Answer: RNA
Question 10
Which vitamin is fat-soluble?
Answer: Vitamin A
Additional Practice Questions with Solutions
Question 11
Why is sucrose a non-reducing sugar?
Solution:
Both anomeric carbons are involved in glycosidic bond formation, leaving no free aldehyde or ketone group.
Question 12
Why do enzymes have optimum temperature?
Solution:
At low temperatures, activity is slow; at high temperatures, enzymes denature.
Question 13
Why are proteins called polymers?
Solution:
They are made up of repeating amino acid units linked by peptide bonds.
Question 14
Why is DNA more stable than RNA?
Solution:
DNA has deoxyribose sugar and double-stranded structure, making it more stable.
Question 15
Why are vitamins essential?
Solution:
They act as coenzymes and are required for metabolic processes.
Final Revision Tips
To excel in the Top 5 Biomolecules Questions, revise NCERT line-by-line and focus on definitions, structures, and functions. Avoid skipping small details, as NEET often asks direct factual questions. Regular revision of the Top 5 Biomolecules Questions ensures strong retention and quick recall during the exam.
Consistent practice of the Top 5 Biomolecules Questions will help you confidently solve even tricky conceptual questions in NEET.