NEET Biology Biomolecules MCQs Set 20

Practice MCQs for NEET Biology Biomolecules

Review structured MCQ sets for NEET Biology Biomolecules. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.

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Multiple Choice Questions

Question 1: Which of the following is an amino-acid-derived hormone?
(a) epinephrine
(b) ecdysone
(c) estradiol
(d) estriol
Show Answer & Explanation

Answer: (a) epinephrine

Explanation:
1. Epinephrine is derived from tyrosine; the others are steroids

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 2: The amino acid glycine is coded by:
(a) CCC, CCG, CCA
(b) GGG, GGC, GGU
(c) UUU, UUC, UUA
(d) AAA, AAC, AAG
Show Answer & Explanation

Answer: (b) GGG, GGC, GGU

Explanation:
1. Glycine codons begin with GG

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 3:
Assertion (A): A phospholipid is an amphipathic molecule.
Reason (R): A phospholipid contains both hydrophobic and hydrophilic ends.
(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. Amphipathic means having both water-loving and water-fearing parts
2. So R is the definition and explains A

Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.

Question 4: Which element is present in a negligible amount in the human body?
(a) O
(b) C
(c) H
(d) Si
Show Answer & Explanation

Answer: (d) Si

Explanation:
1. Silicon is only a trace element in humans

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 5: Which compound is found in the acid-soluble pool during analysis of living tissue?
(a) protein
(b) lipid
(c) polysaccharide
(d) monosaccharide
Show Answer & Explanation

Answer: (d) monosaccharide

Explanation:
1. Small molecules of mol. wt. below 1000 Da, like amino acids and sugars, form the acid-soluble pool

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 6: Which of the following is not a macromolecule?
(a) amino acid
(b) nucleotide
(c) monosaccharide
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. All three are small building-block molecules

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 7: Valine is a:
(a) alpha-amino acid
(b) beta-amino acid
(c) gamma-amino acid
(d) all three types
Show Answer & Explanation

Answer: (a) alpha-amino acid

Explanation:
1. Its amino group is on the carbon next to the carboxyl group

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 8: Alpha-amino acids are those which:
(a) take part in protein synthesis
(b) have the COOH and NH2 groups on the same carbon
(c) are 20 types
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. All three statements describe alpha-amino acids

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 9:
Assertion (A): Fructose is a non-reducing sugar.
Reason (R): It has a ketonic 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: (d) A is false, but R is true.

Explanation:
1. Fructose is a reducing sugar because it tautomerises to an aldose in alkali, so A is false
2. It does have a ketone group, so R is true

Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.

Question 10: Which statement is correct?
(a) amino acids may be considered as substituted methane
(b) alpha-amino acids differ only in the R group
(c) in serine the R group is hydroxymethyl
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. The central carbon carries NH2, COOH, H and R; serine has CH2OH

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 11: The R group in glycine is:
(a) -CH2-OH
(b) -H
(c) -CH3
(d) none
Show Answer & Explanation

Answer: (b) -H

Explanation:
1. Glycine has hydrogen as its side chain

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 12: Which is an acidic amino acid?
(a) valine
(b) glutamic acid
(c) arginine
(d) lysine
Show Answer & Explanation

Answer: (b) glutamic acid

Explanation:
1. Glutamic acid has a second carboxyl group

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 13: Which is an aromatic amino acid?
(a) tyrosine
(b) tryptophan
(c) phenylalanine
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. All three have an aromatic ring in the side chain

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 14: The total number of carbon atoms in palmitic acid is:
(a) 15
(b) 16
(c) 17
(d) 20
Show Answer & Explanation

Answer: (b) 16

Explanation:
1. Palmitic acid is CH3(CH2)14COOH, with 16 carbons

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 15:
Assertion (A): Most enzymes are proteins which have a three-dimensional structure.
Reason (R): The secondary structure of proteins is due to the formation of ionic bonds.
(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. Enzymes are folded globular proteins, so A is true
2. Secondary structure is stabilised by hydrogen bonds, not ionic bonds, so R is false

Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.

Question 16: A component of a simple lipid is:
(a) glycerol
(b) glycol
(c) fatty acid
(d) both glycerol and fatty acid
Show Answer & Explanation

Answer: (d) both glycerol and fatty acid

Explanation:
1. Simple lipids (fats) are esters of glycerol and fatty acids

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 17: Lipids may be:
(a) monoglycerides
(b) diglycerides
(c) triglycerides
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. Glycerol can carry one, two or three fatty acids

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 18: The lipids found in cell membranes are:
(a) phospholipids
(b) lecithin
(c) both phospholipid and lecithin
(d) palmitic acid
Show Answer & Explanation

Answer: (c) both phospholipid and lecithin

Explanation:
1. Lecithin is a phospholipid, so the first two are the same group

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 19: A heterocyclic ring is found in:
(a) nitrogenous bases
(b) ring structure of monosaccharides
(c) proteins
(d) both nitrogenous bases and monosaccharide rings
Show Answer & Explanation

Answer: (d) both nitrogenous bases and monosaccharide rings

Explanation:
1. Bases have N in the ring, and pyranose or furanose rings contain oxygen

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 20: Which of the following is a secondary metabolite?
(a) rubber
(b) alkaloids
(c) terpenoids
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. All are secondary metabolites of plants

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 21:
Assertion (A): Starch can be stained with iodine, but cellulose cannot, although both are homopolymers of glucose.
Reason (R): Cellulose does not contain complex helices, so it cannot hold iodine molecules.
(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. Starch coils into a helix in which iodine is trapped, giving a blue colour
2. Cellulose is a straight chain with no such cavity

Teacher's Note:
1. Check each statement on its own, then ask whether R explains A.

Question 22: Which statement is correct?
(a) lipids are biomacromolecules
(b) lipids have molecular weight below 1000 Da
(c) proteins are heteropolymers
(d) all are correct except the first one
Show Answer & Explanation

Answer: (d) all are correct except the first one

Explanation:
1. Lipids are not true macromolecules, but they are found in the acid-insoluble fraction because of membrane vesicles

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 23: DNA is:
(a) a biomacromolecule
(b) acidic in nature
(c) a polymer of nucleotides
(d) all of the above
Show Answer & Explanation

Answer: (d) all of the above

Explanation:
1. DNA is a large acidic polynucleotide

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 24: Which statement is false?
(a) glycerol is trihydroxy propane
(b) cellulose does not show the iodine test
(c) blood glucose in an adult is 4.5 to 5.0 mM
(d) lipids are macromolecules
Show Answer & Explanation

Answer: (d) lipids are macromolecules

Explanation:
1. Lipids are not true macromolecules, so the last statement is false

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 25: Corn is immersed in boiling water and then cooled. The solution becomes sweet because:
(a) enzymes are inactivated in boiling water
(b) disaccharides are converted to monosaccharides
(c) monosaccharides are converted to disaccharides
(d) none of these
Show Answer & Explanation

Answer: (b) disaccharides are converted to monosaccharides

Explanation:
1. Hot water hydrolyses sugars or starch to sweeter simple sugars

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

Question 26: All of the following statements about glycogen are true except:
(a) branching occurs after about ten residues
(b) it is a copolymer of glucose and mannose
(c) it has alpha-1,4 glycosidic linkages
(d) it has alpha-1,6 glycosidic linkages
Show Answer & Explanation

Answer: (b) it is a copolymer of glucose and mannose

Explanation:
1. Glycogen is a homopolymer of glucose

Teacher's Note:
1. Recall the standard NCERT fact for this topic.

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FAQs

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