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Biomolecules — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

A crushed tissue is mixed with trichloroacetic acid and filtered. Glucose and amino acids are found mainly in the filtrate. What does this show?
  1. They belong to the acid-soluble pool of small biomolecules ✓
  2. They are polymers trapped in the acid-insoluble fraction
  3. They are inorganic minerals because they dissolve
  4. They occur only after proteins are denatured
Answer: A. Small metabolites enter the acid-soluble filtrate, while cellular macromolecules remain in the residue. Students often equate every biological carbon compound with the insoluble ‘biomass’ fraction.
Why not B: Proteins, nucleic acids and polysaccharides form the acid-insoluble macromolecular fraction, unlike free monomers.
Why not C: Solubility in this extraction does not make an organic sugar or amino acid inorganic.
Why not D: Free metabolites exist in living tissue before acid treatment; they are not merely denaturation products.
Elemental analysis detects carbon, hydrogen, oxygen and nitrogen in tissue, but it cannot reveal whether the carbon occurs in glucose or protein. Why?
  1. Living tissue contains no discrete compounds
  2. Carbon is destroyed during elemental analysis
  3. Elemental composition does not specify how atoms are bonded into molecules ✓
  4. Proteins and glucose contain identical elements in identical ratios
Answer: C. Elemental analysis reports which atoms and how much, not their bonding arrangements. Molecular extraction and identification are needed to distinguish compounds sharing elements.
Why not A: Cells contain identifiable molecules even though analysis may destroy their structure.
Why not B: Carbon is measured after conversion to simple products; it is not absent from the result.
Why not D: Their compositions and ratios differ, but an elemental total still loses molecular connectivity.
A cellular component has a molecular mass below 800 Da but appears in the acid-insoluble fraction because it occurs in large membrane aggregates. Which component fits?
  1. Glycogen
  2. DNA
  3. A membrane lipid ✓
  4. A ribosomal protein
Answer: C. Individual lipids are small, but water-insoluble membrane assemblies sediment with the macromolecular fraction. The extraction category therefore reflects aggregation as well as molecular mass.
Why not A: Glycogen is insoluble because it is a true high-molecular-mass polysaccharide.
Why not B: DNA is a covalent nucleotide polymer far above the small-molecule range.
Why not D: A ribosomal protein is itself a macromolecular polypeptide, not the noted low-mass exception.

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Every NCERT question in this chapter is solved, free: NCERT solutions — Biomolecules →

Other NEET Biology chapters

The Living WorldBiological ClassificationPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering Plants

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Questions

How many NEET questions are there on Biomolecules?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login, and you get your all-India rank on every one. Nothing on the site is on sale right now.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.