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Chemistry

Biomolecules

A Chemistry chapter of the NEET syllabus, and how to practise it for the computer-based exam.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Biomolecules carried 4 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Biomolecules, with the answer and the working. Try before you peek.

Question 1 · NEET 2026

The correct statement with regard to the secondary structure of DNA/RNA is
  1. A.RNA possesses a single strand helix structure and contains thymine as one of the four bases
  2. B.DNA possesses a double strand helix structure and contains thymine as one of the four bases
  3. C.RNA possesses a double strand helix structure and contains uracil as one of the four bases
  4. D.DNA possesses a single strand helix structure and contains uracil as one of the four bases
Answer and explanation

Answer: B

DNA has a double-stranded helical secondary structure (two antiparallel polynucleotide chains) and its four bases are adenine, guanine, cytosine and thymine. RNA is generally single-stranded and contains uracil in place of thymine, so only the DNA statement pairing double-strand + thymine is correct.

Question 2 · NEET 2020

Which of the following is a basic amino acid ?
  1. A.Alanine
  2. B.Tyrosine
  3. C.Lysine
  4. D.Serine
Answer and explanation

Answer: C

Lysine is a basic amino acid due to the presence of an additional amino group (−NH2-\mathrm{NH}_{2}) in its side chain, making it positively charged at physiological pH. Chapter: Biomolecules.

How to practise Biomolecules

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free NEET mini mock with answers.

Nearby Chemistry chapters

Questions

How many questions did Biomolecules have in NEET 2026?

Biomolecules carried 4 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Biomolecules PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Biomolecules important for NEET 2027?

It is part of the Chemistry syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

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