Assertion(A): Lac operon regulation is a kind of regulation of enzyme synthesis by its substrate.
Reason(R): Lac operon is regulated by the presence of glucose in the medium which acts as an inducer.
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: Gene Regulation: Lac Operon |
80%
From NCERT
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Assertion (A): DNA polymerase II fills the gap that is left after the removal of RNA primers during DNA replication.
Reason (R): In eukaryotes RNA polymerase I transcribesrRNA, hnRNA and t-RNA.
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. Both (A) and (R) are false.
Reason (R): In eukaryotes RNA polymerase I transcribesrRNA, hnRNA and t-RNA.
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. Both (A) and (R) are false.
Subtopic: DNA Replication | Transcription |
51%
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Assertion (A): Both the strands DNA are not copied during transcription.
Reason (R): The two RNA molecules if produced simultaneously would be complementary to each other, hence would form a double stranded RNA which would prevent RNA from being translated into protein.
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. Both (A) and (R) are false.
Reason (R): The two RNA molecules if produced simultaneously would be complementary to each other, hence would form a double stranded RNA which would prevent RNA from being translated into protein.
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. Both (A) and (R) are false.
Subtopic: Transcription |
83%
From NCERT
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Assertion (A): The split gene arrangement represents probably the ancient feature of genome.
Reason (R): The process of splicing represents the dominance of RNA world
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. Both (A) and (R) are false.
Reason (R): The process of splicing represents the dominance of RNA world
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. Both (A) and (R) are false.
Subtopic: Transcription |
68%
From NCERT
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The ‘beads-on-string’ is the description used for the structure of:
| 1. | nucleolus in a nucleus |
| 2. | heterochromatic inactivated X chromosome in females |
| 3. | nucleosome in chromatin |
| 4. | tetrad of paired homologs in first meiosis |
Subtopic: DNA Packaging |
94%
From NCERT
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Consider the two statements:
| Statement I: | The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called a nucleosome. |
| Statement II: | A typical nucleosome contains 200 bp of DNA helix. |
| 1. | Statement I is incorrect; Statement II is correct |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: DNA Packaging |
92%
From NCERT
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Consider the given statements:
| Assertion (A): | On one strand the replication of DNA is continuous, while on the other, it is discontinuous. |
| Reason (R): | The discontinuously synthesised fragments are later joined by the enzyme DNA ligase. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: DNA Replication |
83%
From NCERT
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The mRNA codons for glutamic acid and valine can respectively be:
1. UAG and UGA
2. UUU and GGG
3. GAG and GUG
4. AUG and UAC
1. UAG and UGA
2. UUU and GGG
3. GAG and GUG
4. AUG and UAC
Subtopic: Search for Genetic Material:I | Search for Genetic Material: II | DNA Replication: I | DNA Replication: II | DNA Replication:III | Solved Problems | Transcription: I | Transcription:II | Transcription: III | Transcription: IV |
87%
From NCERT
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The salient features of the Double-helix structure of DNA include all the following except:
| 1. | It is made of two polynucleotide chains, where the backbone is constituted by sugar-phosphate, and the bases project inside. |
| 2. | The two chains have anti-parallel polarity. |
| 3. | The bases in two strands are paired through hydrogen bonds (H-bonds) forming base pairs (bp). |
| 4. | The two chains are coiled in a left-handed fashion. |
Subtopic: DNA Double Helix |
91%
From NCERT
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There is now enough evidence to suggest that essential life processes (such as metabolism, translation, splicing, etc.), evolved around:
1. DNA
2. RNA
3. Proteins
4. Lipids
1. DNA
2. RNA
3. Proteins
4. Lipids
Subtopic: DNA Fingerprinting |
79%
From NCERT
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