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Q. No.Nucleic Acids:
I:
are polynucleotides.
II:
are constituents of the true macromolecular fraction of any living tissue or cell.
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: Nucleic Acid |
86%
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Regarding the primary structure of a protein:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | The sequence of amino acids i.e., the positional information in a protein is called the primary structure of a protein. |
| II: | A protein is imagined as a line, the left end represented by the first amino acid and the right end represented by the last amino acid. |
| III: | The first amino acid is also called as C-terminal amino acid and the last amino acid is called the N-terminal amino acid. |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Structural Organisation of Proteins |
75%
From NCERT
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Adult human haemoglobin consists of:
I: 4 subunits.
II: 4 types of subunits.
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: 4 subunits.
II: 4 types of subunits.
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: Structural Organisation of Proteins |
86%
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In a polypeptide or a protein, amino acids are linked by a peptide bond which is formed:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | when the carboxyl (-COOH) group of one amino acid reacts with the amino (-NH2) group of the next amino acid |
| II: | with the elimination of a water moiety (the process is called dehydration) |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Zwitter ion & Peptide Bond |
88%
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The direction of a phosphodiester bond [in a polynucleotide chain] is:
| 1. | 5’ – 3’ | 2. | 3’ – 5’ |
| 3. | 1’ – 3’ | 4. | 3’ – 1’ |
Subtopic: Nucleic Acid |
52%
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The famous Watson-Crick model of DNA helix describes its:
| 1. | Primary structure | 2. | Secondary structure |
| 3. | Tertiary structure | 4. | Quaternary structure |
Subtopic: The DNA |
69%
From NCERT
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Almost all enzymes are proteins but a few may be:
| 1. | nucleic acids | 2. | carbohydrates |
| 3. | lipids | 4. | metal ions |
Subtopic: Enzymes |
80%
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In the absence of an enzyme, the reaction catalysed by this enzyme:
1. will not take place
2. is very slow
3. produces some other product
4. gets faster
1. will not take place
2. is very slow
3. produces some other product
4. gets faster
Subtopic: Enzyme Catalysis |
81%
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In an enzyme catalysed biochemical reaction, the formation of enzyme-substrate complex is:
1. optional and transient
2. obligatory and transient
3. obligatory and permanent
4. needed only in anabolic reactions
1. optional and transient
2. obligatory and transient
3. obligatory and permanent
4. needed only in anabolic reactions
Subtopic: Enzyme Catalysis |
86%
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Consider the two statements:
| Statement I: | Whether it is an exothermic or spontaneous reaction or an endothermic or energy requiring reaction, the ‘S’ has to go through a much higher energy state or transition state. |
| Statement II: | Enzymes eventually bring down this energy barrier of activation energy making the transition of ‘S’ to ‘P’ more easy. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Enzyme Catalysis |
87%
From NCERT
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