Identify the incorrect statement about tertiary structure of proteins.

The structure remains intact when exposed to pH changes.

They can be fibrous or globular in structure.

The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.

A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.

Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A). (T and Y represent one letter code for amino acids)

Amino acid (A) - Y Hormone (B) - Thyroxine

Amino acid (A) - T Hormone (B) - Insulin

Amino acid (A) - T Hormone (B) - Thyroxine

Amino acid (A) - Y Hormone (B) - Insulin

Biomolecules — JEE Main Previous Year Questions

180 solved PYQs · 2016–2026 · Chemistry

Solved PYQs: 180
Years covered: 2016–2026
Avg / year: ~16
Subject: Chemistry

How many JEE Main questions come from Biomolecules?

Biomolecules has contributed 180 questions to Joint Entrance Examination (Main) papers between 2016 and 2026 — an average of about 16 questions a year. That count is measured from EByAi’s bank of 55,289 JEE Main questions, not estimated from a syllabus. Every one of the 180 questions carries a written, step-by-step solution, and each is tagged to Biomolecules within Chemistry, so you can drill this chapter across every year at once instead of hunting through paper PDFs. Practising a chapter’s full PYQ history is the fastest way to learn the patterns examiners reuse.

Sample Biomolecules questions from real JEE Main papers

These are 5 real questions from the bank — exactly as asked, with the answer one tap away. All 180 Biomolecules questions (with full written solutions) are available in practice.

Question 1 · JEE Main 2026
Identify the incorrect statement about tertiary structure of proteins.
1. (A) $They can be fibrous or globular in structure.$
2. (B) $The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.$
3. (C) $The structure remains intact when exposed to pH changes.$
4. (D) $A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.$
Show answerAnswer
$Answer: (C) The structure remains intact when exposed to pH changes.$
Question 2 · JEE Main 2026
Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of
1. (A) $L-sugar component$
2. (B) $D-sugar component$
3. (C) $Chiral phosphate unit$
4. (D) $Base unit$
Show answerAnswer
$Answer: (B) D-sugar component$
Question 3 · JEE Main 2026
The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:
1. (A) $8$
2. (B) $3$
3. (C) $4$
4. (D) $6$
Show answerAnswer
$Answer: (D) 6$
Question 4 · JEE Main 2026
Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A). (T and Y represent one letter code for amino acids)
1. (A) $Amino acid (A) - T Hormone (B) - Insulin$
2. (B) $Amino acid (A) - T Hormone (B) - Thyroxine$
3. (C) $Amino acid (A) - Y Hormone (B) - Thyroxine$
4. (D) $Amino acid (A) - Y Hormone (B) - Insulin$
Show answerAnswer
$Answer: (C) Amino acid (A) - Y Hormone (B) - Thyroxine$
Question 5 · JEE Main 2026
Match List - I with List - II. List - I Vitamin List - II Name A Vitamin B 1 I Pyridoxine B Vitamin B 2 II Ascorbic acid C Vitamin B 6 III Thiamine D Vitamin C 4 IV Riboflavin. Choose the correct answer from the options given below:
1. (A) $A-II, B-I, C-III, D-IV$
2. (B) $A-IV, B-III, C-II, D-I$
3. (C) $A-III, B-IV, C-I, D-II$
4. (D) $A-I, B-III, C-II, D-IV$
Show answerAnswer
$Answer: (C) A-III, B-IV, C-I, D-II$

Biomolecules questions by year

Year	Questions	Share of chapter questions
2026	19
2025	20
2024	22
2023	24
2022	24
2021	28
2020	14
2019	18
2018	5
2017	3
2016	3

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FAQs

How many JEE Main questions have been asked from Biomolecules?

EByAi's bank holds 180 real JEE Main questions from Biomolecules, asked between 2016 and 2026 — about 16 per year on average. Every count is measured from actual papers, not estimated.

Is Biomolecules important for JEE Main?

180 questions over 11 papers make Biomolecules a moderate-weightage chapter in JEE Main Chemistry. The year-wise table above shows exactly how often it appears.

Can I solve Biomolecules PYQs online for free?

Yes. EByAi lets you solve JEE Main past-year questions in the browser with written solutions — free daily practice, no card needed.

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