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Q. No.Consider the given two statements:
Assertion: Stop codons signal release of the nascent polypeptide from the ribosome.
Reason: Multiple cognate tRNAs have anticodons complementary to these stop signals.
1. Both Assertion and Reason are true but Reason does not correctly explain the Assertion.
2. Assertion is false but Reason is true.
3. Assertion is true but Reason is false.
4. Both Assertion and Reason are true and Reason correctly explains the Assertion.
Subtopic: Mutations and Genetic Code |
69%
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Consider the given two statements:
| Assertion (A): | Errors in the third position of the triplet codon usually cause only a silent mutation or an error that would not affect the protein. |
| Reason (R) | The genetic code is a triplet code. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Genetic Code: II |
From NCERT
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Consider the given two statements:
| Assertion (A): | There has to be a mechanism to read the genetic code and also to link it to the amino acids. |
| Reason (R): | The rRNA acts as an adapter molecule between transcription and translation in the central dogma of molecular biology. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: Translation Mechanism |
75%
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Consider the given two statements:
| Assertion (A): | In the first phase of translation itself, amino acids are activated in the presence of ATP. |
| Reason (R): | If two such charged tRNAs are brought close enough, the formation of peptide bond between them would be favoured energetically. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A) |
Subtopic: Translation |
50%
From NCERT
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Consider the given two statements:
| Assertion (A): | In prokaryotes, control of the rate of translational initiation is the predominant site for control of gene expression. |
| Reason (R): | In prokaryotes, it is the metabolic, physiological or environmental conditions that regulate the expression of genes. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Translation |
From NCERT
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Histone proteins that help i forming the nucleosomes in the nucleus are rich in basic amino acids such as:
1. Arginine and tyrosine
2. Lysine and histidine
3. Arginine and lysine
4. Histidine and tryptophan
1. Arginine and tyrosine
2. Lysine and histidine
3. Arginine and lysine
4. Histidine and tryptophan
Subtopic: DNA Packaging |
94%
From NCERT
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Consider the given two statements:
| Assertion (A): | The accessibility of promoter regions of prokaryotic DNA is in many cases regulated by the interaction of proteins with sequences termed operators. |
| Reason (R): | Each operon has its specific operator. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: Gene Regulation: Lac Operon |
62%
From NCERT
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Consider the given two statements:
| Assertion (A): | A very low level of expression of lac operon is present in the E.coli cell all the time. |
| Reason (R): | Lactose can enter the cell only due to the presence of β galactosidase in the cell. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: Gene Regulation: Lac Operon |
66%
From NCERT
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Consider the given two statements:
| Assertion (A): | Regulation of lac operon by repressor is referred to as negative regulation. |
| Reason (R): | Essentially, regulation of lac operon can also be visualised as regulation of enzyme synthesis by its substrate. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 4. | (A) is False but (R) is True. |
Subtopic: Gene Regulation: Lac Operon |
71%
From NCERT
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Consider the given two statements:
| Assertion (A): | HGP [Human Genome Project] was closely associated with the rapid development of a new area in biology called Bioinformatics. |
| Reason (R): | The enormous amount of data expected to be generated also necessitated the use of high speed computational devices for data storage and retrieval, and analysis. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is False but (R) is True. |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: Human Genome Project |
70%
From NCERT
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