12th Chemistry Book Volume 2. We covered all the 12th Chemistry Book Volume 2 MCQs in this post for free so that you can practice well for the exam.
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12th Chemistry Book Volume 2 Objective for Students
Enzymes belong to which class of compounds?
(A) Hydrides
(B) Polynitrogen heterocyclic compounds
(C) Polysaccharides
(D) Polypeptides
Option d – Polypeptides
By the action of enzymes, the rate of biochemical reaction
(A) Decreases
(B) Increases
(C) Do not change
(D) Either A or B
Option c – Do not change
Enzymes are
(A) Complex nitrogenous substances produced
(B) Living organisms
(C) Dead organisms
(D) All of the above
Option d – All of the above
Every living cell contains at least …….. different enzymes.
(A) 65
(B) 203
(C) 700
(D) 1000
Option d – 1000
Enzymes in the living systems
(A) Transport oxygen
(B) Provide energy
(C) Provide immunity
(D) Catalyze biological reactions
Option d – Catalyze biological reactions
Enzymes
(A) Consist of amino acids
(B) Accelerate biochemical reactions
(C) Have optimum at body temperature
(D) Have all these properties.
Option d – Have all these properties
Precipitation of proteins is called
(A) Reduction
(B) Polymerization
(C) Precipitation
(D) Denaturation
Option d – Denaturation
The catalyst for various biochemical reactions in living organisms is called
(A) Hormones
(B) Proteins
(C) Enzymes
(D) Carbohydrates
Option c – Enzymes
The conversion of maltose into glucose is catalyzed by
(A) Oxidase
(B) Maltase
(C) Diastase
(D) Invertase
Option b – Maltase
The name of the enzyme ends in the suffix
(A) -ane
(B) -ene
(C) -ose
(D) -ase
Option d – -ase
Chemically enzymes are
(A) Fatty acids
(B) Proteins
(C) Oils
(D) Minerals
Option b – Proteins
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