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Enzymes Online Exam Quiz

Important questions about Enzymes. Enzymes MCQ questions with answers. Enzymes exam questions and answers for students and interviews.

Enzyme activity can be blocked or retarded on minute disturbance in


A : a. density

B : b. optimum ph

C : c. temperature

D : d. concentration

Non-protein part of an enzyme is called


A : a. co-enzyme

B : b. co-factor

C : c. substrate

D : d. activator

A definite charge bearing site of an enzyme on which a chemical substance attaches itself is called


A : a. active site

B : b. available site

C : c. catalytic site

D : d. binding site

An enzyme which is devoid of its either prosthetic group or co-enzyme is designates as


A : a. holoenzyme

B : b. apoenzyme

C : c. substrate

D : d. coenzyme

Inactive form of pepsin which has power of destroying cell's internal structure is known as


A : a. pepsinogen

B : b. pectin

C : c. pancreatic

D : d. amino pectin

Enzymes are quite sensitive to change in concentration, temperature and


A : a. location

B : b. climate

C : c. pH

D : d. pressure

If co-factor is loosely attached to protein part, it is termed as


A : a. substrate

B : b. prosthetic group

C : c. catalyst

D : d. co-enzyme

A chemical substance which have ability to block an active site is called


A : a. blocker

B : b. deactivator

C : c. inhibitor

D : d. enzyme

If vibration become too violent on increasing heat above limit, enzyme activity will be lost and enzyme is said to be


A : a. catalyzed

B : b. broken

C : c. denatured

D : d. failed

Lock and Key model was developed for visualization of substrate and enzyme concentration was proposed by


A : a. Emil Fischer

B : b. F. Sanger

C : c. Erwin Chargaff

D : d. Edward

Enzymes are capable of recognizing and reacting with a special chemical substance called


A : a. activator

B : b. substrate

C : c. co-factor

D : d. co-enzyme

Enzymes which are helpful in cellular respiration is found in


A : a. Golgi complex

B : b. chloroplast

C : c. mitochondria

D : d. RNA

Optimum Ph for Chymotrypsin is


A : a. 8

B : b. 7

C : c. 7--8

D : d. 7--9

Argument about enzyme, that they induces change in its structure when a substrate combines with enzyme was highlighted in


A : a. Lock and Key model

B : b. Induce Fit model

C : c. Conceptual model

D : d. Both a and b

Inhibitors blocking active site by making covalent bonds are specifically known as


A : a. reversible inhibitors

B : b. irreversible inhibitor

C : c. competitive inhibitors

D : d. non-competitive inhibitors

If concentration of an enzyme is increased by two fold, rate of reaction would be


A : a. half

B : b. double

C : c. triple

D : d. ceased

A co-factor and a polypeptide chain co-exist in an activated enzyme called as


A : a. co-factor

B : b. holoenzyme

C : c. apoenzyme

D : d. catalyst

Chemical reactions are accelerated by


A : a. high concentration

B : b. high ph

C : c. high temperature

D : d. high density

For enzyme activity in human body, optimum temperature is


A : a. 37c

B : b. 34c

C : c. 33c

D : d. 32c

Mechanism of enzyme activity is termed as


A : a. hydrolysis

B : b. catalysis

C : c. proteolysis

D : d. hydration

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