NEET Biology Biomolecules MCQs Set 18

Download NEET 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.

Chapter-wise Objective Questions: Biomolecules

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

Question 1: The milk protein is:
(a) lactogen
(b) myosin
(c) casein
(d) pepsin
Show Answer & Explanation

Answer: (c) casein

Explanation:
1. Casein is the main protein of milk

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

Question 2: Chemically, most enzymes are:
(a) fats
(b) carbohydrates
(c) hydrocarbons
(d) proteins
Show Answer & Explanation

Answer: (d) proteins

Explanation:
1. Enzymes are globular proteins (a few are RNA)

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

Question 3:
Assertion (A): The primary structure of a protein is the positional information in the protein.
Reason (R): The primary structure is determined by the amino acid sequence.
(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. Primary structure means the order of amino acids from the N-terminal to the C-terminal
2. So R explains A

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

Question 4: The simplest amino acid is:
(a) tyrosine
(b) lysine
(c) glycine
(d) aspartic acid
Show Answer & Explanation

Answer: (c) glycine

Explanation:
1. In glycine the R group is H

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

Question 5: Amino acids that cannot be synthesised by the body are called:
(a) non-essential
(b) essential
(c) deaminated
(d) all of these
Show Answer & Explanation

Answer: (b) essential

Explanation:
1. They must be supplied by the diet, so they are essential

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

Question 6: Which of the following differs in different animals?
(a) fats
(b) carbohydrates
(c) proteins
(d) vitamins
Show Answer & Explanation

Answer: (c) proteins

Explanation:
1. Protein sequence is species-specific because it is coded by genes

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

Question 7: Fats are formed in the body when:
(a) glycogen is formed from glucose
(b) sugar level becomes stable in blood
(c) extra glycogen storage in liver and muscles is stopped
(d) all of them
Show Answer & Explanation

Answer: (c) extra glycogen storage in liver and muscles is stopped

Explanation:
1. When glycogen stores are full, extra glucose is converted to fat

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

Question 8: For body growth and repair one needs:
(a) carbohydrates
(b) fats
(c) proteins
(d) vitamins
Show Answer & Explanation

Answer: (c) proteins

Explanation:
1. Proteins are the building material of tissues

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

Question 9:
Assertion (A): The last amino acid of any protein is known as the C-terminal amino acid.
Reason (R): The last amino acid of any protein has a free -COOH 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. The chain ends with an amino acid whose carboxyl group is not part of a peptide bond
2. That free COOH gives the name C-terminal

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

Question 10: In India, the best protein source for a herbivorous person is:
(a) pulses
(b) potato
(c) egg
(d) meat
Show Answer & Explanation

Answer: (a) pulses

Explanation:
1. Pulses are rich in protein

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

Question 11: Proteins are transported in the body in the form of:
(a) amino acids
(b) natural proteins
(c) enzymes
(d) nucleic acids
Show Answer & Explanation

Answer: (a) amino acids

Explanation:
1. Digestion breaks proteins into amino acids, which are absorbed and carried in blood

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

Question 12: Which is sweet in taste but is not a sugar?
(a) starch
(b) saccharine
(c) lactose
(d) protein
Show Answer & Explanation

Answer: (b) saccharine

Explanation:
1. Saccharin is an artificial sweetener, not a carbohydrate

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

Question 13: The formation of a protein can be considered as:
(a) dehydration synthesis
(b) dehydration analysis
(c) hydration synthesis
(d) hydration analysis
Show Answer & Explanation

Answer: (a) dehydration synthesis

Explanation:
1. Each peptide bond forms with loss of one water molecule

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

Question 14: In flowering plants, sugars are translocated in the form of:
(a) glucose
(b) sucrose
(c) fructose
(d) maltose
Show Answer & Explanation

Answer: (b) sucrose

Explanation:
1. Sucrose is the transport sugar in phloem

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

Question 15:
Assertion (A): Metal ions are important for the functioning of cells.
Reason (R): Metal ions may act as cofactors for several enzymes.
(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. Many enzymes need Zn, Mg, Fe, Cu and similar ions to work
2. So R explains A

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

Question 16: Sucrose is composed of:
(a) glucose and fructose
(b) glucose and glycogen
(c) two molecules of glucose
(d) glycogen and fructose
Show Answer & Explanation

Answer: (a) glucose and fructose

Explanation:
1. Sucrose = glucose + fructose joined by an alpha-1,2 glycosidic bond

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

Question 17: Which of the following amino acids is essential?
(a) alanine
(b) glycine
(c) tryptophan
(d) tyrosine
Show Answer & Explanation

Answer: (c) tryptophan

Explanation:
1. Tryptophan must be taken in food; the others can be made

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

Question 18: Which disaccharide gives two molecules of glucose on hydrolysis?
(a) maltose
(b) sucrose
(c) lactose
(d) none
Show Answer & Explanation

Answer: (a) maltose

Explanation:
1. Maltose is glucose + glucose

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

Question 19: Which sugar is found in ATP?
(a) deoxyribose
(b) ribose
(c) trehalose
(d) glucose
Show Answer & Explanation

Answer: (b) ribose

Explanation:
1. ATP has adenine, ribose and three phosphates

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

Question 20: Deficiency of protein leads to:
(a) rickets
(b) scurvy
(c) kwashiorkor
(d) carotenemia
Show Answer & Explanation

Answer: (c) kwashiorkor

Explanation:
1. Kwashiorkor is protein deficiency; rickets is vitamin D and scurvy is vitamin C deficiency

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

Question 21:
Assertion (A): Saturated fatty acids are non-essential fatty acids.
Reason (R): They can be synthesised in the animal body.
(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. Essential fatty acids are the unsaturated linoleic and linolenic acids
2. Saturated ones can be made in the body, so R explains A

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

Question 22: Lactose is composed of:
(a) glucose + galactose
(b) glucose + fructose
(c) glucose + glucose
(d) glucose + mannose
Show Answer & Explanation

Answer: (a) glucose + galactose

Explanation:
1. Milk sugar is a glucose-galactose disaccharide

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

Question 23: The true statement for the cellulose molecule is:
(a) beta-1,4 linkage, unbranched
(b) beta-1,4 linkage, branched
(c) alpha-1,4 linkage, branched
(d) beta-1,6 linkage, unbranched
Show Answer & Explanation

Answer: (a) beta-1,4 linkage, unbranched

Explanation:
1. Cellulose is an unbranched chain of beta-glucose joined by beta-1,4 bonds

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

Question 24: Variation among proteins is due to:
(a) sequence of amino acids
(b) number of amino acids only
(c) R group only
(d) none
Show Answer & Explanation

Answer: (a) sequence of amino acids

Explanation:
1. The order of amino acids (primary structure) decides the protein

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

Question 25: Antibodies are:
(a) gamma globulins
(b) albumins
(c) vitamins
(d) sugars
Show Answer & Explanation

Answer: (a) gamma globulins

Explanation:
1. Antibodies belong to the gamma globulin fraction of plasma proteins

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

Question 26: The sweetest of the naturally occurring sugars is:
(a) glucose
(b) fructose
(c) sucrose
(d) saccharin
Show Answer & Explanation

Answer: (b) fructose

Explanation:
1. Fructose is sweeter than sucrose and glucose

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

Question 27:
Assertion (A): Maltose is a reducing sugar.
Reason (R): In maltose a 1-2 glycosidic linkage is present, so a free -CHO group is present.
(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. Maltose has a free anomeric carbon, so it is reducing, hence A is true
2. The linkage in maltose is alpha-1,4, not 1-2, so R is false

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

Free study material for Biology

Multiple Choice Questions (MCQs) for NEET Biology Biomolecules

Chapter MCQs with Answers for NEET Biology

Explore reliable practice questions for Biomolecules tailored for NEET Biology learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

Expert Practice Material for NEET Biology

Cross-reference your completed choices with comprehensive NCERT solutions for NEET Biology to ensure absolute clarity across all sub-topics in this chapter.

Complete Your Chapter Revision

Follow up your worksheet practice by attempting the interactive online Biology MCQ test for this chapter to evaluate your execution speed. All platform resources are free to access.

FAQs

Where can I access latest NEET Biology Biomolecules MCQs Set 18?

You can get most exhaustive NEET Biology Biomolecules MCQs Set 18 for free on StudiesToday.com. These MCQs for NEET Biology are updated for the 2026-27 academic session as per NEET examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Biology NEET material?

Yes, our NEET Biology Biomolecules MCQs Set 18 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the NEET paper is now competency-based.

How do practicing Biology MCQs help in scoring full marks in NEET exams?

By solving our NEET Biology Biomolecules MCQs Set 18, NEET students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Biology.

Do you provide answers and explanations for NEET Biology Biomolecules MCQs Set 18?

Yes, Biology MCQs for NEET have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused NEET exams.

Can I practice these Biology NEET MCQs online?

Yes, you can also access online interactive tests for NEET Biology Biomolecules MCQs Set 18 on StudiesToday.com as they provide instant answers and score to help you track your progress in Biology.