NEET Biology Biomolecules MCQs Set 09

Biology Objective Questions and Answers: 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.

Download Biomolecules MCQs with Answers

View or download the dedicated Biomolecules MCQ resource below. Practicing these 50 objective questions regularly builds familiarity with standard exam patterns and helps secure higher marks in final Biology evaluations.

Multiple Choice Questions

Question 1: Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these
(a) Enhance oxidative metabolism
(b) Are conjugated proteins
(c) Are exclusively synthesized in the body of a living organism as at present
(d) Help in regulating metabolism
Show Answer & Explanation

Answer: (d) Help in regulating metabolism

Explanation:
1. (1) is incorrect, because enzymes can both enhance and inhibit the oxidative metabolism. (3) is incorrect, different enzymes, vitamins and hormones are synthesized in the body at different situations. (2) is incorrect, because all hormones and enzymes are not conjugated protein.

Question 2: Carbohydrates, the most abundant biomolecules on earth, are produced by
(a) All bacteria, fungi and algae
(b) Fungi, algae and green plant cells
(c) Some bacteria, algae and green plant cells
(d) Viruses, fungi and bacteria
Show Answer & Explanation

Answer: (c) Some bacteria, algae and green plant cells

Explanation:
1. Autotrophic organism produce glucose by photosynthesis which is a carbohydrate.
2. Heterotrophic are dependent on autotrophes and don't produce carbohydrate and fungi are saprobic organisms.

Question 3: The catalytic efficiency of two different enzymes can be compared by the
(a) The Km value
(b) The pH optimum value
(c) Formation of the product
(d) Molecular size of the enzyme
Show Answer & Explanation

Answer: (a) The Km value

Explanation:
1. This option, The Km value, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 4: The four elements that make up 96% of all the elements found in a living system are
(a) C, H, O and P
(b) C, N, O and P
(c) H, O, C and N
(d) C, H, O and S
Show Answer & Explanation

Answer: (c) H, O, C and N

Explanation:
1. % weight of human body : C = 18.5; O = 65.0; N = 3.3; H = 0.5.

Question 5: Essential amino acid is
(a) Phenylalanine
(b) Glycine
(c) Aspartic acid
(d) Serine
Show Answer & Explanation

Answer: (a) Phenylalanine

Explanation:
1. Essential amino acids are leucine, isoleucine, valine, tryptophane, phenylalanine, lysine and methionine.

Question 6: The major role of minor elements inside living organisms is to act as
(a) Co-factors of enzymes
(b) Building blocks of important amino acids
(c) Constituents of hormones
(d) Binders of cell structure
Show Answer & Explanation

Answer: (a) Co-factors of enzymes

Explanation:
1. Minor elements basically includes Zn, Mg, K, Ni, Co, NAD+, NADP+, they all come under the category of cofactor.

Question 7: About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
(a) Sulphur and magnesium
(b) Magnesium and sodium
(c) Calcium and phosphorus
(d) Phosphorus and sulphur
Show Answer & Explanation

Answer: (c) Calcium and phosphorus

Explanation:
1. This option, Calcium and phosphorus, is the correct choice, as it agrees with the standard NCERT account of this topic.

Question 8: Which of the following is a neutral amino acid?
(a) Glutamine
(b) Arginine
(c) Valine
(d) Asparagine
Show Answer & Explanation

Answer: (c) Valine

Explanation:
1. Glutamine, Asparagine → Amide group containing amino-acid.
2. Arginine → Basic amino acid.

Question 9: Which of the following is incorrect regarding the amino acids and their functions?
(a) Tyrosine : Converted into epinephrine hormone and used in the synthesis of melanin pigment
(b) Glycine : Involved in the formation of heme
(c) Tryptophan : Helps in the synthesis of auxin hormone
(d) Histidine : Can be converted into histamine by the removal of amino group
Show Answer & Explanation

Answer: (d) Histidine : Can be converted into histamine by the removal of amino group

Explanation:
1. Histamine is derived from amino acid histidine through decarboxylation.

Question 10: Which of the following is not a secondary metabolite of plant cell?
(a) Rubber
(b) Chlorophyll
(c) Essential oil
(d) Tannins
Show Answer & Explanation

Answer: (b) Chlorophyll

Explanation:
1. Rubber → Polymeric substance Essential oil Tannins → Pigments.

Question 11: Which are the most diverse molecules in the cell?
(a) Lipids
(b) Mineral salts
(c) Proteins
(d) Carbohydrates
Show Answer & Explanation

Answer: (c) Proteins

Explanation:
1. This is so because protein are made up of 20 different amino acids and are heteropolymers of amino acids.

Question 12: The most abundant organic compound on earth is
(a) Protein
(b) Cellulose
(c) Lipids
(d) Steroids
Show Answer & Explanation

Answer: (b) Cellulose

Explanation:
1. Plant cell wall is made up of cellulose.

Question 13: Haemoglobin is a type of
(a) Carbohydrate
(b) Respiratory pigment
(c) Vitamin
(d) Skin pigment
Show Answer & Explanation

Answer: (b) Respiratory pigment

Explanation:
1. This is so because haemoglobin get binds to oxygen and help in the transportation of O2.

Question 14: Collagen is
(a) Fibrous protein
(b) Globular protein
(c) Lipid
(d) Carbohydrate
Show Answer & Explanation

Answer: (a) Fibrous protein

Explanation:
1. This is so because collagen are thread like proteins, which are insoluble in water.

Question 15: Maltose is formed of two molecules of
(a) Fructose
(b) Lactose
(c) Glucose
(d) Sucrose
Show Answer & Explanation

Answer: (c) Glucose

Explanation:
1. Fructose = Monosaccharides Lactose = Galactose + Glucose Sucrose = Glucose + Fructose Maltose = Glucose + Glucose.

Question 16: Agar is commercially obtained from
(a) Red algae
(b) Blue-green algae
(c) Brown algae
(d) Green algae
Show Answer & Explanation

Answer: (a) Red algae

Explanation:
1. Agar is a type of mucopolysaccharide and is obtained from red algae.
2. It is used as culture medium in laboratory.

Question 17: Which of the following groups consists of polysaccharides only?
(a) Sucrose, glucose and fructose
(b) Maltose, lactose and fructose
(c) Glycogen, sucrose and maltose
(d) Glycogen, cellulose and starch
Show Answer & Explanation

Answer: (d) Glycogen, cellulose and starch

Explanation:
1. Sucrose → Disaccharide; Fructose → Monosaccharide Glucose → Monosaccharide; Maltose → Disaccharide Lactose → Disaccharide; Glycogen → Polysaccharide Cellulose → Polysaccharide; Starch → Polysaccharide.

Question 18: Cellulose, the most important constituent of plant cell wall is made up of
(a) Branched chain of glucose molecules linked by α1, 4 glycosidic bond in straight chain and α1, 6 glycosidic bond at the site of branching
(b) Unbranched chain of glucose molecules linked by β1, 4 glycosidic bond
(c) Branched chain of glucose molecules linked by α1, 6 glycosidic bond at the site of branching
(d) Unbranched chain of glucose molecules linked by α1, 4 glycosidic bond
Show Answer & Explanation

Answer: (b) Unbranched chain of glucose molecules linked by β1, 4 glycosidic bond

Explanation:
1. Glycogen and starch are branched polymer of glucose while cellulose is unbranched polymer of β glucose.

Question 19: Which of the following is a reducing sugar?
(a) Galactose
(b) Gluconic acid
(c) β-methyl galactoside
(d) Sucrose
Show Answer & Explanation

Answer: (a) Galactose

Explanation:
1. This is so because it can reduce Cu2+ ions into Cu+ ion.

Question 20: An important step in the manufacture of pulp for paper industry is the
(a) Preparation of pure cellulose
(b) Treatment of wood with chemicals that break down cellulose
(c) Removal of oils present in the wood by treatment with suitable chemicals
(d) Removal of water from the wood by prolonged heating at approximately 50°C
Show Answer & Explanation

Answer: (a) Preparation of pure cellulose

Explanation:
1. This is so because the raw material for paper is cellulose.

Question 21: Which of the following statements is false?
(a) Cellulose is the most abundant organic compound in the biosphere
(b) Cellulose is an unbranched polymer with β-1,4 glycosidic bonds
(c) Rayon and cellophane are chemically similar to cellulose xanthate
(d) Cellulose can be digested by the herbivores by β-amylase, produced by the glandular cells of their alimentary canal
Show Answer & Explanation

Answer: (d) Cellulose can be digested by the herbivores by β-amylase, produced by the glandular cells of their alimentary canal

Explanation:
1. Cellulose can be digested by the herbivores because they have special type cellulose digesting micro-organism for the digestion of cellulose.

Question 22: If the total amount of adenine and thymine in a double-stranded DNA is 60%, the amount of guanine in this DNA will be
(a) 15%
(b) 20%
(c) 30%
(d) 40%
Show Answer & Explanation

Answer: (b) 20%

Explanation:
1. A + T = 60% Then, C + G = 40%, when 20% ⇒ C and 20% = G.

Question 23: DNA has equal number of adenine and thymine residues (A = T) and equal number of guanine and cytosine (G = C). These relationships are known as
(a) Chargaff's rule
(b) Coulomb's law
(c) Le Chatelier's principle
(d) Van't Hoff plot
Show Answer & Explanation

Answer: (a) Chargaff's rule

Explanation:
1. This option, Chargaff's rule, is the correct choice, as it agrees with the standard NCERT account of this topic.

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Biomolecules Objective Questions & Solutions for NEET Biology

NEET Biology Biomolecules Objective Test Questions

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FAQs

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