The number of correct statements from the given statements is:
I: Almost all enzymes are proteins.
II: Some nucleic acids can behave like enzymes.
III: No enzyme in living organisms can function above 400C.
IV: Enzymes are the reason that chemicals react with each other.
V: Enzymes are not sensitive to pH in their environment.
1. 2
2. 3
3. 4
4. 5
Subtopic: Â Enzymes |Â Enzyme Catalysis |Â Factors Affecting Enzyme Catalysis Reaction |
From NCERT
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Consider the two statements:
Statement I: Palmitic acid has 16 carbons including carboxyl carbon.
Statement II: Arachidonic acid has 20 carbon atoms including the carboxyl carbon.
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Statement I: Palmitic acid has 16 carbons including carboxyl carbon.
Statement II: Arachidonic acid has 20 carbon atoms including the carboxyl carbon.
1. Statement I is correct; Statement II is incorrect
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is correct
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Â Lipids |
 92%
From NCERT
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If we represent the chemical composition of living tissue from abundance point of view and arrange them class-wise, the second most abundant chemical in living organisms is:
1. Water
2. Protein
3. Carbohydrate
4. Nucleic acid
1. Water
2. Protein
3. Carbohydrate
4. Nucleic acid
Subtopic: Â Element Analysis |
 77%
From NCERT
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The two strands of polynucleotides in a DNA double helix:
I: are identical.
II: are complementary.
III: are parallel.
IV: are antiparallel.
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
I: are identical.
II: are complementary.
III: are parallel.
IV: are antiparallel.
1. Only I and II are correct
2. Only III and IV are correct
3. Only I and III are correct
4. Only II and IV are correct
Subtopic: Â The DNA |
 94%
From NCERT
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Match each item in Column I with one in Column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Lyases | P | catalyse removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds |
| B | Ligases | Q | catalysing the linking together of 2 compounds |
| C | Transferases | R | catalysing a transfer of a group other than hydrogen between a pair of substrates |
| D | Isomerases | S | catalysing inter-conversion of optical, geometric or positional isomers |
Codes:
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | Q | P | R | S |
| 3. | P | Q | S | R |
| 4. | R | R | Q | S |
Subtopic: Â Enzymes Classification |
 91%
From NCERT
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Coenzymes nicotinamide adenine dinucleotide (NAD) and NADP contain the vitamin:
1. Riboflavin
2. Pantothenic acid
3. Niacin
4. Pteroylglutamic acid
1. Riboflavin
2. Pantothenic acid
3. Niacin
4. Pteroylglutamic acid
Subtopic: Â Enzyme Cofactors |
 92%
From NCERT
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The substrate has to go through a much higher energy state or transition state:
I: if it is an exothermic or spontaneous reaction.
II: it is an endothermic or energy requiring reaction.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
I: if it is an exothermic or spontaneous reaction.
II: it is an endothermic or energy requiring reaction.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â Mechanism of Enzymes |
 62%
From NCERT
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When the co-factor is removed from the enzyme:
1. catalytic activity is lost
2. catalytic activity is reduced
3. catalytic activity is increased
4. catalytic activity remains same
1. catalytic activity is lost
2. catalytic activity is reduced
3. catalytic activity is increased
4. catalytic activity remains same
Subtopic: Â Enzyme Cofactors |
 85%
From NCERT
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Polysaccharides are components of cell wall in:
I: Plants
II: Fungi
III: Eubacteria
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
I: Plants
II: Fungi
III: Eubacteria
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Subtopic: Â Carbohydrates |
 62%
From NCERT
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Subtopic: Â Lipids |
 76%
From NCERT
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