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Q. No.Consider the following genetic code:
Which among the following would cause a frameshift mutation?
1. substitution of A by C in codon 2
2. insertion of G after C in codon 4
3. insertion of GCU after C in codon 6
4. deletion of codon 3, GAG
Subtopic: Genetic Code: III |
57%
From NCERT
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| Assertion (A): | RNA polymerases are able to catalyse all three steps of transcription. |
| Reason (R): | RNA polymerase contains an initiation factor and a termination factor in them. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Transcription: I |
From NCERT
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Which among the following statements about the exons is TRUE?
1. They are stop codons.
2. They are start codons.
3. They are coding sequences.
4. They are intervening sequences.
1. They are stop codons.
2. They are start codons.
3. They are coding sequences.
4. They are intervening sequences.
Subtopic: Transcription: I |
77%
From NCERT
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Study the given diagrammatic representation of Griffith's experiment to demonstrate the transformation in bacteria.
Select the option which is incorrectly representing the experiment:
1. (i) and (ii)
2. (ii) and (iii)
3. (iii) and (iv)
4. (ii) and (iv)
Select the option which is incorrectly representing the experiment:
1. (i) and (ii)
2. (ii) and (iii)
3. (iii) and (iv)
4. (ii) and (iv)
Subtopic: Search for Genetic Material |
90%
From NCERT
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| Assertion (A): | Primary transcripts in eukaryotes are non-functional. |
| Reason (R): | Methyl guanosine triphosphate is attached to 5' -end of hnRNA. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Transcription: IV |
62%
From NCERT
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The length of DNA is:
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: | usually defined as number of nucleotides (or a pair of nucleotide referred to as base pairs) present in it. |
| II: | is the characteristic of an organism. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: The DNA |
79%
From NCERT
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Consider the given two statements:
| Statement I: | A nitrogenous base is linked to the OH of 1'C pentose sugar through a N-glycosidic linkage to form a nucleoside. |
| Statement II: | When a phosphate group is linked to OH of 5'C of a nucleoside through phosphoester linkage, a corresponding nucleotide (or deoxynucleotide depending upon the type of sugar present) is formed. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is incorrect; Statement II is incorrect |
| 3. | Statement I is correct; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is correct |
Subtopic: The DNA |
88%
From NCERT
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In the given diagram:
1. Only I and II are correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II, and III are incorrect
| I: | A is 3’-5’ direction. |
| II: | B is hydrogen bond. |
| III: | C is phosphodiester bond. |
1. Only I and II are correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II, and III are incorrect
Subtopic: DNA Double Helix |
64%
From NCERT
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Deoxythymidine is:
| 1. | a substituted pyrimidine found only in DNA |
| 2. | a nucleoside monophosphate found only in DNA |
| 3. | a nucleoside found in DNA |
| 4. | a nucleotide formed by chemical modifications in a RNA nucleotide |
Subtopic: DNA Double Helix |
54%
From NCERT
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When compared to DNA, in RNA:
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: | every nucleotide residue has an additional –OH group present at 3'-position in the ribose. |
| II: | 5-methyl uracil is found instead of thymine. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: DNA vs RNA as Genetic Material |
From NCERT
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