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Q. No.Which enzyme joins Okazaki fragments on the lagging strand during DNA replication?
1. DNA Polymerase II
2. Topoisomerase
3. DNA Ligase
4. Holoenzyme
Subtopic: DNA Replication |
93%
Level 1: 80%+
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How many of the given functions can be performed by RNA?
1. 2
2. 3
3. 4
4. 5
| A: | Messenger |
| B: | Structural role |
| C: | Adaptor molecule |
| D: | Catalytic role |
| E: | Genetic material in some viruses |
1. 2
2. 3
3. 4
4. 5
Subtopic: The DNA | Translation | DNA Fingerprinting |
86%
Level 1: 80%+
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In the flow of genetic information, according to the central dogma of molecular biology, which molecule acts as an adapter molecule between transcription and translation?
1. mRNA
2. rRNA
3. tRNA
4. miRNA
1. mRNA
2. rRNA
3. tRNA
4. miRNA
Subtopic: Transcription |
85%
Level 1: 80%+
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Which of the following best describes the specificity of the genetic code?
| 1. | The genetic code is universal; codons specify the same amino acids in all organisms. |
| 2. | The genetic code varies significantly among different organisms. |
| 3. | Each amino acid is specified by only one codon. |
| 4. | The genetic code is ambiguous, with one codon coding for multiple amino acids. |
Subtopic: Genetic Code |
81%
Level 1: 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 |
86%
Level 1: 80%+
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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%
Level 1: 80%+
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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 |
Level 3: 35%-60%
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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 |
86%
Level 1: 80%+
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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 |
74%
Level 2: 60%+
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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%
Level 1: 80%+
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