Read the given statements A, B and C and select the correct option.
(A)
All enzymes are proteinaceous in nature.
(B)
Some competitive inhibitors are often used in the control of bacterial pathogens.
(C)
Active site of an enzyme is formed by the folding of the backbone of tertiary structure of protein upon itself.
1. Statements (A) and (B) are correct
2. Statements (B) and (C) are correct
3. Statements (A) and (C) are correct
4. Statements (A), (B) and (C) are correct
Subtopic: Proteins | Enzymes | Factors Affecting Enzyme Catalysis Reaction | Properties of Enzymes |
58%
From NCERT
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Match column-I with column-II and select the correct option.
1. a(iii), b(i), c(ii), d(iv)
2. a(iii), b(ii), c(iv), d(i)
3. a(iii), b(ii), c(v), d(i)
4. a(iii), b(v), c(ii), d(iv)
| Column-I | Column-II | ||
| a. | Catalyse the transfer of specific groups other than hydrogen from one substrate to other | (i) | Oxido- reductases |
| b. | Catalyse the breakdown of larger molecules into smaller with addition of water |
(ii) | Lyases |
| c. | Catalyse removal of groups from substrates by mechanism other than hydrolysis leaving double bonds |
(iii) | Transferases |
| d. | Catalyse linking together of 2 compounds | (iv) | Ligases |
| (v) | Hydrolases |
2. a(iii), b(ii), c(iv), d(i)
3. a(iii), b(ii), c(v), d(i)
4. a(iii), b(v), c(ii), d(iv)
Subtopic: Enzymes Classification |
81%
From NCERT
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Select the correct match from among the following:
1. Collagen – Intracellular ground substance
2. Toxin – Codeine
3. Lectin – Ricin
4. Alkaloid – Morphine
1. Collagen – Intracellular ground substance
2. Toxin – Codeine
3. Lectin – Ricin
4. Alkaloid – Morphine
Subtopic: Primary & Secondary Metabolites |
73%
From NCERT
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Select the incorrect statement among the following:
| 1. | Palmitic acid has 16 carbons including carboxyl carbon. |
| 2. | Lipids are not polymers but they are assembled from smaller molecules by dehydration. |
| 3. | Arachidonic acid has 20 carbon atoms including carboxyl carbon. |
| 4. | Lecithin is an example of phospholipid found in neural tissues but absent in cell membrane. |
Subtopic: Lipids |
82%
From NCERT
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If the enzyme commission number of an enzyme is 2.7.1.1 then it catalyse which of the following reaction?
1. \(\mathrm{AB}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{AH}+\mathrm{BOH}\)
2.
3. \(S-G+S^{\prime} \rightarrow S+S^{\prime}-G\)
4. Alcohol + NAD → Aldehyde + NADH2
1. \(\mathrm{AB}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{AH}+\mathrm{BOH}\)
2.
3. \(S-G+S^{\prime} \rightarrow S+S^{\prime}-G\)
4. Alcohol + NAD → Aldehyde + NADH2
Subtopic: Enzymes Classification |
56%
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Read the given statements and choose the incorrect one:
| 1. | Oils generally have lower melting point than fats. |
| 2. | Percentage of total cellular mass of carbohydrates is higher than that of nucleic acids. |
| 3. | Relative abundance of carbon and hydrogen with respect to other elements is higher in any living organism than in the earth’s crust. |
| 4. | Abrin and ricin are toxins. |
Subtopic: Introduction | Lipids: Fatty Acids | Primary & Secondary Metabolites |
75%
From NCERT
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B-DNA is the most common form of DNA having all the following salient features except
1. The pitch would be 34 Å
2. The strand turns 36° at each step of ascent
3. The rise per base pair is 3.6 Å
4. One full turn of helical strand involves 10 base pairs
1. The pitch would be 34 Å
2. The strand turns 36° at each step of ascent
3. The rise per base pair is 3.6 Å
4. One full turn of helical strand involves 10 base pairs
Subtopic: Nucleic Acid | The DNA |
68%
From NCERT
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Match column I with column II and select the correct option.
Column I Column II
a. Phosphate and hydroxyl group of (i) Peptide bond
sugar in a nucleotide
b. Polymer of amino acids (ii) Glycosidic bond
c. Polysaccharides (iii) Hydrogen bond
d. Adenine and thymine (iv) Ester bond
in a DNA
1. a(ii), b(iii), c(iv), d(i)
2. a(ii), b(iv), c(iii), d(i)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(i), c(iii), d(ii)
Column I Column II
a. Phosphate and hydroxyl group of (i) Peptide bond
sugar in a nucleotide
b. Polymer of amino acids (ii) Glycosidic bond
c. Polysaccharides (iii) Hydrogen bond
d. Adenine and thymine (iv) Ester bond
in a DNA
1. a(ii), b(iii), c(iv), d(i)
2. a(ii), b(iv), c(iii), d(i)
3. a(iv), b(i), c(ii), d(iii)
4. a(iv), b(i), c(iii), d(ii)
Subtopic: The DNA | Amino Acids | Zwitter ion & Peptide Bond | Carbohydrates: Glycosidic Bond & Disaccharide |
86%
From NCERT
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Read the statements A and B carefully and select the correct answer.
Statement A: Enzyme-substrate complex produced during a catalysed reaction is highly reactive.
Statement B: This complex dissociates into its product and changed enzyme with an intermediate formation of enzyme-product
complex.
1. Both statements A and B are correct
2. Both statements A and B are incorrect
3. Only statement A is correct
4. Only statement A is incorrect
Statement A: Enzyme-substrate complex produced during a catalysed reaction is highly reactive.
Statement B: This complex dissociates into its product and changed enzyme with an intermediate formation of enzyme-product
complex.
1. Both statements A and B are correct
2. Both statements A and B are incorrect
3. Only statement A is correct
4. Only statement A is incorrect
Subtopic: Enzymes | Enzyme Catalysis |
From NCERT
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Subtopic: Nucleic Acid: Nucleotides |
58%
From NCERT
NEET - 2013
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