Multiple Choice Questions (MCQs) for NEET Biology: Biomolecules
Access targeted multiple-choice questions for Biomolecules designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.
Practice Biomolecules MCQs for NEET Biology
Navigate directly to the 50 objective questions for Biomolecules using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.
Multiple Choice Questions
(a) alanine and glycine
(b) methionine and serine
(c) tryptophan and tyrosine
(d) lysine and arginine
Show Answer & Explanation
Answer: (d) lysine and arginine
Explanation:
1. Lysine and arginine carry extra amino groups, making histones positively charged
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) pyranose
(b) furanose
(c) dextrorotatory
(d) laevorotatory
Show Answer & Explanation
Answer: (b) furanose
Explanation:
1. Furan has a five-membered ring and pyran a six-membered ring
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) trehalose
(b) galactose
(c) lactose
(d) mannose
Show Answer & Explanation
Answer: (c) lactose
Explanation:
1. Lactose is found only in the milk of mammals
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) glucose
(b) maltose
(c) fructose
(d) sucrose
Show Answer & Explanation
Answer: (d) sucrose
Explanation:
1. Sucrose is a non-reducing sugar because both anomeric carbons are tied in the glycosidic bond
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) glycogen
(b) starch
(c) cellulose
(d) chitin
Show Answer & Explanation
Answer: (b) starch
Explanation:
1. Starch has an unbranched amylose and a branched amylopectin part
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): All monosaccharides are reducing sugars.
Reason (R): Monosaccharides contain a free aldehyde or ketone group.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. Monosaccharides have a free carbonyl group or an anomeric OH, so they reduce Benedict's or Fehling's reagent
2. So R explains A
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) catalase
(b) zinc carbonic anhydrase
(c) transferase
(d) RuBisCO
Show Answer & Explanation
Answer: (d) RuBisCO
Explanation:
1. RuBisCO is the most abundant enzyme and protein on Earth
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) dihydroxyacetone
(b) glyceraldehyde
(c) erythrose
(d) ribose
Show Answer & Explanation
Answer: (a) dihydroxyacetone
Explanation:
1. Dihydroxyacetone has no asymmetric carbon atom
2. The others have chiral carbons
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) phospholipids
(b) cholesterol
(c) glycolipids
(d) proline
Show Answer & Explanation
Answer: (d) proline
Explanation:
1. Proline is an amino acid, not a membrane lipid
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) beta-glucose and alpha-glucose
(b) glucose and mannose
(c) beta-glucose and beta-galactose
(d) glucose and fructose
Show Answer & Explanation
Answer: (c) beta-glucose and beta-galactose
Explanation:
1. Lactose is a galactose-glucose disaccharide with a beta-1,4 linkage
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) O > Ca > Mg > S
(b) S > O > Mg > Ca
(c) Ca > O > S > Mg
(d) Mg > Ca > S > O
Show Answer & Explanation
Answer: (a) O > Ca > Mg > S
Explanation:
1. By mass, oxygen is the most abundant, followed by calcium, magnesium and sulphur
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): Cholesterol is an important biochemical.
Reason (R): Cholesterol is a parent steroid and plays a role in the synthesis of other biologically active steroid hormones.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. Cholesterol is the starting material of steroid hormones, bile salts and vitamin D
2. So R explains A
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) alpha-D-glucopyranose and alpha-D-fructofuranose
(b) alpha-D-glucopyranose and beta-D-fructopyranose
(c) alpha-D-galactopyranose and alpha-D-glucopyranose
(d) alpha-D-glucopyranose and beta-D-fructofuranose
Show Answer & Explanation
Answer: (d) alpha-D-glucopyranose and beta-D-fructofuranose
Explanation:
1. Sucrose contains alpha-D-glucopyranose linked 1,2 to beta-D-fructofuranose
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) K+
(b) Na+
(c) Ca++
(d) H+
Show Answer & Explanation
Answer: (a) K+
Explanation:
1. Potassium is the main cation inside cells; sodium is the main cation outside
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) a simple polysaccharide
(b) a nitrogen-containing polysaccharide
(c) a phosphorus-containing polysaccharide
(d) a sulphur-containing polysaccharide
Show Answer & Explanation
Answer: (b) a nitrogen-containing polysaccharide
Explanation:
1. Chitin is made of N-acetylglucosamine, so it contains nitrogen
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) maltose
(b) sucrose
(c) lactose
(d) ribose
Show Answer & Explanation
Answer: (b) sucrose
Explanation:
1. In sucrose the anomeric carbons of both units are in the glycosidic bond
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) lipoglycans
(b) keratin sulphate and chondroitin sulphate
(c) D-glucosamine
(d) N-acetyl glucosamine
Show Answer & Explanation
Answer: (d) N-acetyl glucosamine
Explanation:
1. Chitin is a polymer of N-acetylglucosamine
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): Phospholipids form a bilayer in aqueous medium.
Reason (R): Phospholipid molecules are amphoteric.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (c) A is true, but R is false.
Explanation:
1. Phospholipids have polar heads and non-polar tails, so they self-assemble into a bilayer, hence A is true
2. They are amphipathic, not amphoteric, so R is false
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) Asp and Glu
(b) Lys and Arg
(c) Gly and Ala
(d) Asp and Gly
Show Answer & Explanation
Answer: (b) Lys and Arg
Explanation:
1. Lysine and arginine have basic side chains, which are protonated at neutral pH
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) chitin
(b) peptidoglycan
(c) cellulose
(d) hemicellulose
Show Answer & Explanation
Answer: (a) chitin
Explanation:
1. Fungal cell walls are made of chitin and glucans
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) three glycerol molecules and one fatty acid molecule
(b) one glycerol and three fatty acid molecules
(c) one glycerol and one fatty acid molecule
(d) three glycerol and three fatty acid molecules
Show Answer & Explanation
Answer: (b) one glycerol and three fatty acid molecules
Explanation:
1. A triglyceride has one glycerol esterified with three fatty acids
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) hydrophobic interactions
(b) ester bonds
(c) hydrogen bonds
(d) electrostatic interactions
Show Answer & Explanation
Answer: (b) ester bonds
Explanation:
1. Folding uses hydrogen bonds, hydrophobic and ionic interactions and disulphide bridges, not ester bonds
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) A-iii, B-ii, C-iv, D-i
(b) A-iii, B-i, C-iv, D-ii
(c) A-i, B-ii, C-iii, D-iv
(d) A-ii, B-iii, C-iv, D-i
Show Answer & Explanation
Answer: (b) A-iii, B-i, C-iv, D-ii
Explanation:
1. Insulin is a hormone, antibodies fight infection, receptors serve sensory reception and GLUT-4 carries glucose into cells
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Assertion (A): All monosaccharides give the Benedict's test.
Reason (R): All monosaccharides contain a free aldehyde or ketone group.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true, but R is false.
(d) A is false, but R is true.
Show Answer & Explanation
Answer: (a) Both A and R are true, and R is the correct explanation of A.
Explanation:
1. Free carbonyl or hemiacetal groups reduce Cu2+ in Benedict's reagent, so R explains A
Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.
(a) a-II, b-III, c-IV, d-I
(b) a-III, b-II, c-IV, d-I
(c) a-II, b-III, c-I, d-IV
(d) a-III, b-II, c-I, d-IV
Show Answer & Explanation
Answer: (a) a-II, b-III, c-IV, d-I
Explanation:
1. Morphine and codeine are alkaloids, lemon grass oil is an essential oil, abrin and ricin are toxins and vinblastine and curcumin are drugs
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) proteins
(b) polysaccharides
(c) lipids
(d) nucleic acids
Show Answer & Explanation
Answer: (c) lipids
Explanation:
1. Lipids are not made of repeating units, so they are not true polymers
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
(a) hydroxyl and methyl
(b) carbonyl and methyl
(c) carbonyl and phosphate
(d) carbonyl and hydroxyl
Show Answer & Explanation
Answer: (d) carbonyl and hydroxyl
Explanation:
1. Sugars are polyhydroxy aldehydes or ketones
Teacher's Note:
1. Recall the standard NCERT fact for this topic.
Biomolecules Objective Questions & Solutions for NEET Biology
Chapter MCQs with Answers for NEET Biology
Test your conceptual understanding of Biomolecules with these targeted multiple-choice questions. Designed in alignment with the latest NEET curriculum for NEET Biology, these problem sets build accuracy and prepare students for objective exams.
Expert Practice Material for NEET Biology
Each question includes structured solution keys mapped directly to standard NEET textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.
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FAQs
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