Biology Class 11

Biology Class 11th Chapter 9 mcqs

Biomolecules Objective Questions

  1. 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

  1. Insulin is made up of _______ and _______.

(a) glucose and fructose

(b) glucose and fructose

(c) fructose and mannose

(d) mannose and glucose

Answer: (b) glucose and fructose

  1. Enzymes increase the rate of reaction by

(a) lowering activation energy

(b) increasing activation energy

(c) increasing temperature and pH

(d) decreasing temperature and pH

Answer: (a) lowering activation energy

  1. Which of the following statements regarding enzyme inhibition is correct?

(a) Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein

(b) Non-competitive inhibitors often bind to the enzyme irreversibly

(c) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme

(d) Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate

Answer: (c) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme

  1. Which of the following is not a pyrimidine?

(a) Uracil

(b) Cytosine

(c) Guanine

(d) Thymine

Answer: (c) Guanine

  1. Hydrolysis of starch occurs with the help of

(a) Peptidase

(b) Amylase

(c) Sucrose

(d) Lipase

Answer: (b) Amylase

  1. 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

  1. Which of the following influence feedback inhibition of enzyme?

(a) End product

(b) External factors

(c) Enzyme

(d) Substrate

Answer: (a) End product

  1. Which of the following is not a polysaccharide?

(a) Lactose

(b) Starch

(c) Glycogen

(d) Dextrin

Answer: (a) Lactose

  1. Inulin is made up of _______ and _______.

(a) glucose and fructose

(b) glucose and fructose

(c) fructose and mannose

(d) mannose and glucose

Answer: (b) glucose and fructose

  1. A protein having both structural and enzymatic traits is

(a) Collagen

(b) Trypsin

(c) Myosin

(d) Actin

Answer: (c) Myosin

  1. NADP contains vitamin ______.

(a) B1

(b) B2

(c) B3

(d) B12

Answer: (c) B3

  1. 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

  1. 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

  1. The fastest enzyme known is

(a) DNA polymerase

(b) carbonic anhydrase

(c) carbonic dehydrogenase

(d) DNA ligase

Answer: (b) carbonic anhydrase

  1. Lecithin is a

(a) polysaccharide

(b) protein

(c) nucleic acid

(d) lipid

Answer: (d) liquid

  1. 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

  1. 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

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