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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?
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
(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?
Answer: (a) Glycoprotein
Which one is a fibrous protein?
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
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?
(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?
(b) Pigments making colours of flowers
(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
(d) Amino acids
Answer: (d) Amino acids
Which of the following is not a conjugated protein?
Answer: (a) Peptone
Lecithin is a
(c) nucleic acid
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
Answer: (c) B3
Hydrolysis of starch occurs with the help of
Answer: (b) Amylase
A protein which lacks a metal is
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?
(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
(c) ¼ Vmax
(d) 2 Vmax
Answer: (a) ½ Vmax
Nitrogen is a component of
Answer: (c) Proteins
A protein having both structural and enzymatic traits is
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
(d) None of these
Answer: (a) 3.4 nm
Most abundant organic compound on earth is
Answer: (a) Cellulose
In RNA, thymine is replaced by
(d) None of these
Answer: (a) Uracil
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