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Q. No.A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in
1. continuous transcription of the structural gene controlled by that regulator
2. complete inhibition of transcription of the structural gene controlled by that regulator
3. irreversible binding of the repressor to the operator
4. inactivation of RNA polymerase by alteration of its active site
Subtopic: Gene Regulation: Lac Operon |
51%
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In the following questions a statement of assertion (A) is followed by a statement of reason (R).
| Assertion (A): | Histones are basic proteins of major importance in packaging of eukaryotic DNA. DNA and histones comprise chromatin, forming the bulk of eukaryotic chromosome. |
| Reason (R): | Histones are of five major types H1, H2A, H2B and H3 and H4 |
| 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: DNA Packaging |
68%
From NCERT
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A:
Exons
and introns are present in split genes.
R: Introns are the information pieces of split genes
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Introns are the information pieces of split genes
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Transcription: I |
66%
From NCERT
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Consider the given two statements:
| Statement I: | In a double stranded DNA molecule, the amount of Guanine should be equal to Cytosine and the amount of Adenine should be equal to Thymine. |
| Statement II: | There are two hydrogen bonds between Adenine and Thymine and three hydrogen bonds between Guanine and Cytosine. |
| 1. | Both Statement I and Statement II are correct and Statement II correctly explains Statement I |
| 2. | Both Statement I and Statement II are correct but Statement II does not correctly explain Statement I |
| 3. | Statement I is correct but Statement II is incorrect |
| 4. | Statement I is incorrect but Statement II is correct |
Subtopic: DNA Double Helix |
65%
From NCERT
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?
1. One of the daughter cells, but not the other, would have radioactive DNA.
2. Neither of the two daughter cells would be radioactive.
3. All four bases of the DNA would be radioactive.
4. DNA in both daughter cells would be radioactive.
1. One of the daughter cells, but not the other, would have radioactive DNA.
2. Neither of the two daughter cells would be radioactive.
3. All four bases of the DNA would be radioactive.
4. DNA in both daughter cells would be radioactive.
Subtopic: DNA Replication |
53%
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Which of the following provides some evidence that RNA probably evolved before DNA?
1. RNA polymerase uses DNA as a template.
2. RNA polymerase makes a single-stranded molecule.
3. RNA polymerase does not require localized unwinding of the DNA.
4. DNA polymerase uses primer, usually made of RNA
1. RNA polymerase uses DNA as a template.
2. RNA polymerase makes a single-stranded molecule.
3. RNA polymerase does not require localized unwinding of the DNA.
4. DNA polymerase uses primer, usually made of RNA
Subtopic: DNA vs RNA as Genetic Material |
59%
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A section of double stranded DNA is composed of 41% adenine bases. What is the percentage of cytosine bases in this section of DNA?
1. 18%
2. 9%
3. 36%
4. 82%
1. 18%
2. 9%
3. 36%
4. 82%
Subtopic: DNA Double Helix |
90%
From NCERT
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Genes involved in turning on (or) off the transcription of a set of structural genes are called
1. Operator genes
2. Polymorphic genes
3. Redundant genes
4. Regulatory genes
1. Operator genes
2. Polymorphic genes
3. Redundant genes
4. Regulatory genes
Subtopic: Gene Regulation: Lac Operon |
66%
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What would happen, if in a gene encoding a polypeptide of 50 amino acids, 25th codon UAU is mutated to UAA?
1. Two polypeptides of 24 and 25 amino acids will be formed
2. A polypeptide of 25 amino acids will be formed
3. A polypeptide of 49 amino acids will be formed
4. A polypeptide of 24 amino acids will be formed
1. Two polypeptides of 24 and 25 amino acids will be formed
2. A polypeptide of 25 amino acids will be formed
3. A polypeptide of 49 amino acids will be formed
4. A polypeptide of 24 amino acids will be formed
Subtopic: Translation |
80%
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Which of the following is the sequence of mRNA transcribed from the below DNA?
3' - ATCCCAGGTACCAT - 5'
1. 3' - UAGGGUCCAUGGUA - 5'
2. 5' - UAGGGUCCAUGGUA - 3'
4. 3' -TAGGGTCCATGGTA -5'
4. 5' - TAGGGTCCATGGTA - 3'
3' - ATCCCAGGTACCAT - 5'
1. 3' - UAGGGUCCAUGGUA - 5'
2. 5' - UAGGGUCCAUGGUA - 3'
4. 3' -TAGGGTCCATGGTA -5'
4. 5' - TAGGGTCCATGGTA - 3'
Subtopic: Transcription |
78%
From NCERT
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