Which of the following statements is incorrect?
I.Nearly 1/3rd of all enzymes requires the presence of metal ions for catalytic function
II.Metal ions form coordinate bond with side chain at active site of metalloenzyme and at the same time form one or more coordinate bonds with the substrate
III.NADP and NAD (coenzymes) contain niacin (vit.)
IV.Coenzymes are organic compounds but their association with the apoenzyme is only transient, usually occurring during catalysis

All of these
Only III and IV
Only IV
None of the above

Select all false statements for an enzyme promoting a chemical reaction by
I.Lowering the energy of activation
II.Causing the release of heat, which acts as a primer
III.Increasing molecular motion
IV.Changing the free energy difference between substrate and product

I and IV
II and III
II, III, IV
III and IV

Match the column I (Component) with Column-II (% of the total cellular mass) and identify the correct options

Column I(Component)	Column II(% of the total cellular mass)
A.Water	1.3
B.Proteins	2.70-90
C.Carbohydrates	3.2
D.Lipids	4.5-7
E.Nucleic acids	5.10-15

A→5; B→2; C→3; D→4; E→1
A→2; B→5; C→1; D→3; E→4
A→3; B→1; C→4; D→5; E→2
A→5; B→4; C→3; D→2; E→1

Match Column – I with Column – II

Column I	Column II
A.Collagen	1.Glucose transport
B.Trypsin	2.Binding with some chemical like for small taste and hormones
C.Insulin	3.Homones
D.Antibody	4.Enzyme
E.Receptor	5.Inter cellular ground substance
F.GLUT-4	6.Fight infectious agents

A→5; B→4;C→3; D→6; E→2; F→1
A→2; B→3; C→4; D→5; E→6; F→1
A→6; B→2; C→1; D→5; E→6; F→3
A→1; B→4; C→3; D→6; E→2; F→5

Match the items in column I with items in column II and choose the correct answer

Column I	Column II
A.Triglyceride	1.Animal hormones
B.Membrane lipid	2.Feathers and leaves
C.Steroid	3.Phospolipids
D.Wax	4.Fat stroed in form of droplets

A→4; B→3; C→1; D→2
A→2; B→3; C→4; D→1
A→3; B→4; C→1; D→2
A→4; B→1; C→2; D→3

Which one is correct ?

I.Segment representing the energy of activation
II.Segment representing the amount of free energy released by the reaction
III.Transition state
IV.Segment would be the same regardless of whether the reaction were uncatalysed or catalysed

I II III IV

1 3 2 4
I II III IV

1 2 3 2
I II III IV

1 3 2 4
I II III IV

1 2 4 3

I	II	III	IV
1	3	2	4

I	II	III	IV
1	2	3	2

I	II	III	IV
1	3	2	4

I	II	III	IV
1	2	4	3

The below structureal formula belongs to –

Glucose
Ribose
Sucrose
Deoxyribose

The adjoining graph shows change in conc.of substrate onenzyme activity. Identify A, B and C.

A B C

Ki K_m V_max
A B C

V_max/2 K_m Ki
A B C

V_max K_m V_max/2
A B C

K_m V_max V_max/2

A	B	C
Ki	K_m	V_max

A	B	C
V_max/2	K_m	Ki

A	B	C
V_max	K_m	V_max/2

A	B	C
K_m	V_max	V_max/2

Question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 : Enzymes are defined as biological proteins.
Statement 2 :Chemically all enzymes are globular proteins.

Statement- 1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement -1
Statement -1 is True, Statement -2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement- 2 is False
)Both the statements are False

Solution

We know that all biological reactions are catalysed by special catalysts called enzyme, thus enzymes are defined as biological proteins. We also know that enzymes are small organic molecules which are weakly held to the protein and can be easily separated by dialysis. Therefore chemically all enzymes are globular proteins.

Question contain STATEMENT-1 (Assertion) and STATEMENT-2 (Reason).Question has 4 choices (a), (b), (c) and (d) out of which ONLY ONE is correct.
Statement 1 :The higher the turn-over number the more efficient an enzyme is.
Statement 2 : It is not dependent upon the number of active sites present over an enzyme.

Statement- 1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement -1
Statement -1 is True, Statement -2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement - 1 is True, Statement- 2 is False
Both the statements are False

Solution

The number of substrate molecules changed per minute by a molecule or enzyme is called turn over number.The higher the turn-over number, the more efficent anenzyme is. It depends upon the number of active sites present over an enzyme.

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