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Q. No.Regarding the primary structure of a protein:
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.
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
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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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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Which of the following will not be correct for the steps of the catalytic cycle of an enzyme action?
| 1. | First, the substrate binds to the active site of the enzyme, fitting into the active site. |
| 2. | The binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate. |
| 3. | The active site of the enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate and the new enzyme- product complex is formed. |
| 4. | The enzyme gets consumed in the reaction while releasing the product. |
Subtopic: Enzyme Catalysis |
86%
From NCERT
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