Question No:1

Inhibition of succinate dehydrogenase by malonate is an example of

[A] non-competitive inhibition
[B] negative feed back
[C] allosteric inhibition
[D] competitive inhibition



Question No:2

Enzymes are divided into

[A] 6 classes, each with 4-13 subclasses and named accordingly by a four-digit number
[B] 7 classes, each with 3-13 subclasses and named accordingly by a four-digit number
[C] 7 classes, each with 4-13 subclasses and named accordingly by a three-digit number
[D] 6 classes, each with 4-20 subclasses and named accordingly by a four-digit number



Question No:3

Enzymes which catalyze oxidoreduction between two substrate belongs to class

[A] oxidoreductase
[B] transferase
[C] Hydrolase
[D] ligase



Question No:4

Enzymes which catalyze transfer of group other than hydrogen belongs to the class

[A] oxidoreductase
[B] transferase
[C] Hydrolase
[D] ligase



Question No:5

Enzymes which catalyze hydrolysis of ester, ether, peptide, glycosidic bond belongs to class

[A] oxidoreductase
[B] transferase
[C] Hydrolase
[D] ligase



Question No:6

Enzymes that catalyze removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds is known as

[A] oxidoreductase
[B] transferase
[C] Hydrolase
[D] lyases



Question No:7

Enzymes which catalyze inter-conversion of optical, geometric or positional isomers belongs to the class of class

[A] isomerase
[B] transferase
[C] Hydrolase
[D] ligase



Question No:8

Enzymes catalyzing the linking together of two compounds, for e.g. enzymes which catalyse joining of C-O, C-S, C-N, P-O etc. bonds, belongs to the class of

[A] isomerases
[B] transferases
[C] Hydrolases
[D] ligases



Question No:9

How many types of cofacter can be identified?

[A] 1
[B] 2
[C] 3
[D] 4



Question No:10

The suffix ‘-‘ added to substrate for naming the enzyme is

[A] -ase
[B] -in
[C] -zyme
[D] —ose



Question No:11

Ptylin is an example of

[A] oxidoreductase
[B] transferase
[C] Hydrolase
[D] ligase



Question No:12

When Apoenzyme is separated from its metal component, its activity is

[A] decreased
[B] increased
[C] lost
[D] remains unaffected



Question No:13

Cofactors are

[A] prosthetic groups
[B] co-enzymes
[C] metallic ions
[D] all



Question No:14

Which of the following combinations is correct?

[A] Metal ions loosely attached with Apoenzyme—Activators
[B] Nonprotein organic part attached tightly to Apoenzyme-Prosthetic group
[C] Nonprotein organic part attached loosely to Apoenzyme-Coenzyme
[D] All



Question No:15

Which one of the following is not cofactor?

[A] Co-enzyme
[B] Metal ions
[C] Prosthetic group
[D] Apoenzyme



Question No:16

Haem is prosthetic group of………. enzyme

[A] peroxidase
[B] catalase
[C] both
[D] none



Question No:17

Zn is activator of………. enzyme

[A] carbonic anhydrase
[B] carboxypeptidase
[C] carboxylases
[D] all



Question No:18

Which of the following statement is correct?
(1) Catalytic activity is lost when the co-factor is removed from the enzyme
(2) Coenzyme nicotinamide adenine dinucleotide (NAD) and NADP contain the vitamin niacin.
(3) Biomacromolecules have a hierarchy of structures-primary, secondary, tertiary and quaternary
(4) Enzymes lower activation energy of reactions and enhance greatly the rate of the reactions.
(5) Nucleic acids carry hereditary information and are passed on from parental generation to progeny,

[A] 1,5 only
[B] 2,3 only
[C] 2,5 only
[D] All



Question No:19

Assertion: Arachidonic acid is an unsaturated fatty acid.
Reason: There are present one or more double bonds between carbon atoms in unsaturated fatty acids.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false



Question No:20

Assertion: Amino acids are amphoteric in their function.
Reason: All amino acids are necessary for our body.

[A] If both the assertion and the reason are true and the reason is a correct explanation of the assertion
[B] If both the assertion and reason are true but the reason is not a correct explanation of the assertion
[C] If the assertion is true but the reason is false
[D] If both the assertion and reason are false