Match the enzymes in Group I with the reaction in Group II. Select the correct combination. Group I Group II P. Hydrolase i. Inter-conversion of optical isomers Q. Lyase ii. Oxidation and reduction of two substrates R. Isomerase iii. Joining of two compounds S. Ligase iv. Removal of a chemical group from one substrate v. Transfer of a chemical group from one substrate to another

P - v , Q - i v , R - i , S - i i i

P - i v , Q - i i , R - i i i , S - i

P - i v , Q - i , R - i i i , S - v

P - i , Q - i v , R - v , S - i i

Match the following lists. List-I List-II List-III A Coenzymes are organic compound i No structure similarities I Ribose-5 phosphate isomerase B Isomerases ii Differ from inorganic catalysis II During catalysis C Non-competitive enzyme inhibition iii Catalyzing interconversion of optical positional isomers III Operates at high temperatures also D Enzyme catalysts iv With the apoenzyme only as a transient IV Metal ion of copper The correct match is:

A B C D iv, II iii, I i, IV ii, III

A B C D iii, III ii, I iv, II i, IV

A B C D iv, II iii, I i, III ii, IV

A B C D iii, III ii, IV iv, I iv, I

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Hydrolysis is a...............reaction and in glycolysis at ............... steps the ATP is hydrolyzed.

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Important Questions on Biomolecules

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Biology>Cell : Structure and Functions>Biomolecules>Enzymes

The formation of the Enzyme - Substrate complex is essential for

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Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Which of the following describes the given graph

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Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Co-enzymes are components of an enzyme complex which are necessary for its function. Which of these is a known co-enzyme?

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Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Solid and dotted lines represent the activities of pepsin and salivary amylase enzymes of the digestive tract, respectively. Which one of the following graphs best represents their activity vs pH?

MEDIUM

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Match the enzymes in Group I with the reaction in Group II. Select the correct combination.

Group I	Group II
P. Hydrolase	i. Inter-conversion of optical isomers
Q. Lyase	ii. Oxidation and reduction of two substrates
R. Isomerase	iii. Joining of two compounds
S. Ligase	iv. Removal of a chemical group from one substrate
	v. Transfer of a chemical group from one substrate to another

EASY

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Serine proteases are called so because they

HARD

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Given below are the four schematics that describe the dependence of the rate of an enzymatic reaction on temperature. Which of the following combination is true for thermophilic and psychrophilic organisms?

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MEDIUM

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

What is enzyme? Write the name of two enzymes?

MEDIUM

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Match the enzymes in Column I with their respective biochemical reactions in column II. Choose the correct combination from below

Column I	Column II
(P) Transaminases	(i) Removal of a phosphoryl group from a specific amino acid
(Q) Protein Kinases	(ii) Removal of α-amino group from a specific amino acid
(R) Protein Phosphatases	(iii) Addition of phosphoryl group to a specific amino acid
(S) Dehydrogenases	(iv) Interconversion of optical isomers
	(v) Oxidation and reduction of substrates

MEDIUM

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Explain the nomenclature of enzymes on the basis of chemical reactions.

MEDIUM

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Match the following lists.

	List-I		List-II		List-III
A	Coenzymes are organic compound	i	No structure similarities	I	Ribose-5 phosphate isomerase
B	Isomerases	ii	Differ from inorganic catalysis	II	During catalysis
C	Non-competitive enzyme inhibition	iii	Catalyzing interconversion of optical positional isomers	III	Operates at high temperatures also
D	Enzyme catalysts	iv	With the apoenzyme only as a transient	IV	Metal ion of copper

The correct match is:

EASY

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Which one of the following statements is correct, with reference to enzymes?

EASY

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Identify the labelled parts $1, 2, 3, 4$ in the concept of activation energy shown in the below diagram?

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HARD

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Study the following

(I)	$K_{m}$ value	Affinity of the enzyme	Inverse measure enzyme affinity
(II)	Hydrolases	$P - O$ bonds	Linking $2$ compounds
(III)	Transferases	Transfer of a group	Inhibitor of reaction
(IV)	Emil Fisher	Lock and key hypothesis	Formation of ES complex

The correct combinations are

EASY

Biology>Cell : Structure and Functions>Biomolecules>Enzymes

Match the following?

Enzymes		Functions
(a)	Lyases	(i)	Oxido reduction
(b)	Isomerases	(ii)	Link compounds
(c)	Dehydrogenases	(iii)	Transfer of group
(d)	Ligases	(iv)	Interconversion
		(v)	Removal of groups