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Q. No.Regarding the working of lac operon in E.coli, which of the following is synthesized constitutively?
1. Repressor
2. Beta galactosidase
3. Transacetylase
4. Permease
Subtopic: Gene Regulation: Lac Operon |
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Consider the given two statements:
| Statement I: | RNA is the genetic material of QB bacteriophage. |
| Statement II: | Among the two nucleic acids, the DNA is a better genetic material. |
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: DNA vs RNA as Genetic Material |
87%
From NCERT
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Consider the following statements about the genetic code:
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statements are correct.
4. Neither Statement is correct.
| I: | It is nearly universal among all organisms. |
| II: | It is ambiguous, meaning that one codon can code for multiple amino acids. |
1. Only Statement I is correct.
2. Only Statement II is correct.
3. Both Statements are correct.
4. Neither Statement is correct.
Subtopic: Genetic Code |
85%
From NCERT
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Which of the following statements about the Human Genome Project (HGP) is true?
| 1. | HGP aimed to sequence the entire genome of a single individual. |
| 2. | HGP was initiated in the early 1990s and completed in 2003. |
| 3. | HGP focused solely on mapping the genes responsible for hereditary diseases. |
| 4. | HGP excluded the study of non-coding regions of the genome. |
Subtopic: Human Genome Project |
77%
From NCERT
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Consider the given two statements:
| Assertion (A): | Both strands of DNA are not transcribed. |
| Reason (R): | Transcribing both strands would create complementary RNA molecules that would bind to each other and interfere with normal cell processes. |
| 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 |
88%
From NCERT
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What would be the effect on the lac operon of a mutation in the lacZ gene?
| 1. | It would prevent the operon from being turned off. |
| 2. | It would result in the inability to metabolize lactose. |
| 3. | It would enhance the binding of the repressor to the operator. |
| 4. | It would prevent the repressor from binding to the operator. |
Subtopic: Gene Regulation: Lac Operon |
73%
From NCERT
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Match the codons with their corresponding amino acids:
1. A-ii, B-i, C-iii, D-iv
2. A-iii, B-iv, C-ii, D-i
3. A-i, B-ii, C-iv, D-iii
4. A-iv, B-iii, C-ii, D-i
| Column I | Column II | ||
| A. | GAG | i. | Valine |
| B. | GUG | ii. | Glutamic acid |
| C. | UGG | iii. | Tryptophan |
| D. | AAA | iv. | Lysine |
1. A-ii, B-i, C-iii, D-iv
2. A-iii, B-iv, C-ii, D-i
3. A-i, B-ii, C-iv, D-iii
4. A-iv, B-iii, C-ii, D-i
Subtopic: Genetic Code |
88%
From NCERT
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The lac operon is an example of:
| 1. | Gene repression by a repressor protein in the presence of lactose. |
| 2. | Gene activation by a repressor protein in the absence of lactose. |
| 3. | Gene activation by an inducer in the absence of glucose. |
| 4. | Gene repression by an inducer in the presence of lactose. |
Subtopic: Gene Regulation: Lac Operon |
From NCERT
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A salient feature of the human genome is that:
| 1. | It contains over 3 billion base pairs and about 20,000-25,000 genes. |
| 2. | The majority of the human genome consists of coding sequences. |
| 3. | Each chromosome contains a single gene that determines human traits. |
| 4. | All human beings have unique sequences of DNA with no similarities. |
Subtopic: Human Genome Project |
80%
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Which of the following is not a property of genetic material?
| 1. | It must be able to replicate. |
| 2. | It must be dynamic, changing rapidly in response to environmental conditions. |
| 3. | It must be able to express itself in the form of phenotypic traits. |
| 4. | It must be able to undergo mutation. |
Subtopic: DNA vs RNA as Genetic Material |
87%
From NCERT
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