Class 11 Biology MCQs Biomolecules for NEET

Here, you will get Class 11 Biology MCQ of Chapter 9 Biomolecules for cracking NEET/AIIMS. By solving these MCQs of Class 11 Biology Chapter 9 Biomolecules, you will get the confidence to crack NEET. Practice MCQ Questions for Class 11 Biology with Answers on a daily basis and score well in exams. 

Biomolecules Class 11 MCQs Questions with Answers

An example of competitive inhibition of an enzyme is the inhibition of
(a) succinic dehydrogenase by malonic acid
(b) cytochrome oxidase by cyanide
(c) hexokinase by glucose-6-phosphate
(d) carbonic anhydrase by carbon dioxide

Answer: (a) succinic dehydrogenase by malonic acid

Which of the following is not a pyrimidine?
(a) Uracil
(b) Cytosine
(c) Guanine
(d) Thymine

Answer: (c) Guanine

Which one of the following is wrongly matched?
(a) Enzyme – Lipopolysaccharide
(b) Phospholipid – Plasma membrane
(c) ATP – Nucleotide derivative
(d) Antibody – Glycoprotein

Answer: (a) Enzyme – Lipopolysaccharide

Nitrogenous bases present in DNA
(a) Adenine, guanine, cytosine, uracil
(b) Adenine, guanine, cytosine, thymine
(c) Adenine, thymine, uracil
(d) Guanine, uracil

Answer: (b) Adenine, guanine, cytosine, thymine

Enormous diversity of protein molecules is due to
(a) R groups of amino acids
(b) Sequence of amino acids
(c) Peptide bonds
(d) Amino groups of amino acids

Answer: (b) Sequence of amino acids

Among the following natural materials, the largest amount of cellulose is found in
(a) Wood
(b) Fruit pulp
(c) Wheat straw
(d) Cotton fibre

Answer: (d) Cotton fibre

Anti-parallel strands of a DNA molecule mean that
(a) One strand turns anticlockwise
(b) Phosphate groups at the start of two DNA strands (poles) are in opposite position
(c) Phosphate groups of two DNA strands at their ends share the same position
(d) One strand turns clockwise

Answer: (b) Phosphate groups at the start of two DNA strands (poles) are in opposite position

Which of the following is a non-reducing sugar?
(a) Lactose
(b) Glucose
(c) Maltose
(d) Sucrose

Answer: (a) Glycoprotein

Which one is a fibrous protein?
(a) Collagen
(b) Haemoglobin
(c) Globulin
(d) Hordein

Answer: (a) Collagen

Assertion: Arachidic acid is an unsaturated fatty acid.
Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
(a) Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
(b) Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
(c) Assertion is true, but Reason is false
(d) Both Assertion and Reason are false

Answer: (d) Both Assertion and Reason are false

With reference to enzymes, which one of the following statements is true?
(a) Apoenzyme = Holoenzyme + Coenzyme
(b) Holoenzyme = Apoenzyme + Coenzyme
(c) Coenzyme = Apoenzyme + Holoenzyme
(d) Holoenzyme = Coenzyme – Apoenzyme

Answer: (b) Holoenzyme = Apoenzyme + Coenzyme

The amino acids which are not synthesized in our body are called
(a) Deaminated
(b) Non-essential
(c) Essential
(d) Proteinaceous.

Answer: (c) Essential

Which of the following secondary metabolites is wrongly matched?
(a) Pigments – Carotenoids, anthocyanins
(b) Polymeric substances – Rubber, gums
(c) Toxin – Abrin, ricin
(d) Alkaloids – Lemon grass oil

Answer: (d) Alkaloids – Lemon grass oil

Which of the following is required as inducer(s) for the expression of Lac operon?
(a) Glucose
(b) Galactose
(c) Lactose
(d) Lactose and galactose

Answer: (c) Lactose

Proteins perform many physiological functions. For example, some function as enzymes. Which one of the following represents an additional function which some proteins discharge?
(a) Antibiotics
(b) Pigments making colours of flowers
(c) Hormones
(d) Pigments conferring colour to skin

Answer: (c) Hormones

Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of
(a) allosteric inhibition
(b) feedback inhibition
(c) uncompetitive inhibition
(d) competitive inhibition

Answer: (d) competitive inhibition

An enzyme/protein is formed by chemically bonding together
(a) CO2
(b) Lipases
(c) Carbohydrates
(d) Amino acids

Answer: (d) Amino acids

Which of the following is not a conjugated protein?
(a) Peptone
(b) Glycoprotein
(c) Chromoprotein
(d) Lipoprotein

Answer: (a) Peptone

Lecithin is a
(a) polysaccharide
(b) protein
(c) nucleic acid
(d) lipid

Answer: (d) lipid

Select the option which is not correct with respect to enzyme action
(a) Substrate binds with enzyme at its active site.
(b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.
(c) A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.
(d) Malonate is a competitive inhibitor of succinic dehydrogenase.

Answer: (b) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.

Enzymes, vitamins and hormones are common in
(a) Enhancing oxidative metabolism
(b) Being synthesised in the body of organisms
(c) Being proteinaceous
(d) Regulating metabolism

Answer: (d) Regulating metabolism

The minimum amount of energy required to initiate a chemical reaction is called
(a) enzymatic energy
(b) activation energy
(c) substrate energy
(d) initiation energy

Answer: (b) activation energy

NADP contains vitamin
(a) B1
(b) B2
(c) B3
(d) B12

Answer: (c) B3

Hydrolysis of starch occurs with the help of
(a) Peptidase
(b) Amylase
(c) Sucrose
(d) Lipase

Answer: (b) Amylase

A protein which lacks a metal is
(a) Glycoprotein
(b) Haemoglobin
(c) Ferredoxin
(d) Cytochrome

Answer: (a) Glycoprotein

The naturally occurring form of amino acid in proteins
(a) L-amino acids only
(b) D-amino acids only
(c) Both L and D amino acids
(d) None of these

Answer: (a) L-amino acids only

Which one of the following is a non – reducing carbohydrate?
(a) Maltose
(b) Sucrose
(c) Lactose
(d) Ribose 5 – phosphate

Answer: (b) Sucrose

The fastest enzyme known is
(a) DNA polymerase
(b) carbonic anhydrase
(c) carbonic dehydrogenase
(d) DNA ligase

Answer: (b) carbonic anhydrase

The Km value of the enzyme is the value of the substrate concentration at which the reaction reaches to
(a) ½ Vmax
(b) Zero
(c) ¼ Vmax
(d) 2 Vmax

Answer: (a) ½ Vmax

Nitrogen is a component of
(a) Carbohydrates
(b) Lipids
(c) Proteins
(d) Polyphosphates

Answer: (c) Proteins

A protein having both structural and enzymatic traits is
(a) Collagen
(b) Trypsin
(c) Myosin
(d) Actin

Answer: (c) Myosin

Inulin is made up of _______ and _______
(a) mannose and fructose
(b) glucose and fructose
(c) fructose and mannose
(d) mannose and glucose

Answer: (b) glucose and fructose

Length of one turn of the helix in a B-form DNA is approximately
(a) 3.4 nm
(b) 0.34 nm
(c) Both
(d) None of these

Answer: (a) 3.4 nm

Most abundant organic compound on earth is
(a) Cellulose
(b) Steroids
(c) Protein
(d) Lipids

Answer: (a) Cellulose

In RNA, thymine is replaced by
(a) Uracil
(b) Guanine
(c) Both
(d) None of these

Answer: (a) Uracil

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