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Q. No.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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Consider the given two statements:
| Assertion (A): | For sequencing, the total DNA from a cell is isolated and converted into random fragments of relatively smaller sizes. |
| Reason (R): | DNA is a very long polymer, and there are technical limitations in sequencing very long pieces of DNA. |
| 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 |
83%
From NCERT
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Consider the given two statements:
| Assertion (A): | The repetitive satellite DNA sequences form the basis of DNA fingerprinting. |
| Reason (R): | These sequences normally do not code for any proteins, but they form a large portion of human genome. |
| 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: DNA Fingerprinting |
From NCERT
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A region of coding stand of DNA has the following nucleotide sequence : \(5'-TACGCCG-3'\)
The sequence of bases on mRNA transcribed by this would be:
1. \(5'-UACGCCG-3'\)
2. \(3'-UACGCCG-5'\)
3. \(5'-ATGCGGC-3'\)
4. \(3'-ATGCGGC-5'\)
The sequence of bases on mRNA transcribed by this would be:
1. \(5'-UACGCCG-3'\)
2. \(3'-UACGCCG-5'\)
3. \(5'-ATGCGGC-3'\)
4. \(3'-ATGCGGC-5'\)
Subtopic: The DNA |
51%
From NCERT
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A DNA molecule is 160 base pairs long. If it has 20% adenine, how many cytosine bases are present in this DNA molecule?
1. 48
2. 64
3. 96
4. 192
1. 48
2. 64
3. 96
4. 192
Subtopic: The DNA |
From NCERT
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A template strand in a bacterial DNA has the given base sequence : \(5'-AGGTTTAACG-3'\)
What would be the RNA sequence transcribed from this template strand ?
1. \(5'-CGUUAAACCU-3'\)
2. \(5'-AGGUUUUUCG-3'\)
3. \(5'-TCCAAATTGC-3'\)
4. \(5'-AGGTTTAACG-3'\)
What would be the RNA sequence transcribed from this template strand ?
1. \(5'-CGUUAAACCU-3'\)
2. \(5'-AGGUUUUUCG-3'\)
3. \(5'-TCCAAATTGC-3'\)
4. \(5'-AGGTTTAACG-3'\)
Subtopic: Transcription: I |
56%
From NCERT
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In the presence of allolactose, the lac repressor in the operon of E.coil :
1. Binds to the operator
2. Cannot bind to the operator
3. Binds to the promoter
4. Binds to the regulator
1. Binds to the operator
2. Cannot bind to the operator
3. Binds to the promoter
4. Binds to the regulator
Subtopic: Gene Regulation: Lac Operon |
70%
From NCERT
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Taylor and colleagues performed experiments on ............ using radioactive ............ to prove that the DNA in chromosomes replicate semi-conservatively.
Select the correct option for the blanks.
1. Vicia faba, Uridine
2. E. coli, Uridline
3. Vicia faba, Thymidine
4. E.coil, Thymidine
Select the correct option for the blanks.
1. Vicia faba, Uridine
2. E. coli, Uridline
3. Vicia faba, Thymidine
4. E.coil, Thymidine
Subtopic: DNA Replication: II |
From NCERT
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