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Q. No.Consider the following statements:
I:
In prokaryotes, control of the rate of transcriptional initiation is the predominant site for control of gene expression.
II:
Regulation of lac operon by CAP is referred to as negative regulation.
III:
The inducer of the lac operon is lactose.
Which of the above statements are true?
1.
I and II only
2.
I and III only
3.
II and III only
4.
I, II, and III
Subtopic: Gene Regulation: Lac Operon |
56%
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Consider the following statements:
| I: | The cellular factory responsible for synthesizing proteins is the ribosome. |
| II: | The ribosome also acts as a catalyst for the formation of a peptide bond. |
| III: | The UTRs (untranslated regions) in an mRNA are not required for translation. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Subtopic: Translation |
71%
From NCERT
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Which of the following cannot be inferred from the information given in the following diagram?
| 1. | The DNA from the crime scene matches that of individual B |
| 2. | VNTRs are hypervariable |
| 3. | The larger fragments remain near the point of introduction in the gel electrophoresis |
| 4. | The smaller chromosomes in the human genome have smaller repeats of VNTR |
Subtopic: DNA Fingerprinting |
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Study the diagram given below and choose the correct information that can be deduced:
| 1. | The core RNA polymerase is capable of catalyzing elongation only. |
| 2. | Sigma factor and Rho factor are needed for the termination of transcription. |
| 3. | DNA Helicase opens the strand of the DNA. |
| 4. | Both strands of DNA are transcribed by the same RNA polymerase. |
Subtopic: Transcription: I |
63%
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Consider the transcription unit given in the following diagram and choose the correct statements:
| I: | The promoter on the template is situated upstream and 5’ to the structural gene. |
| II: | It is the presence of the structural gene that defines the template strand. |
| III: | The coding strand does not code for anything and is displaced during transcription. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: Transcription |
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Study the results of the Meselson and Stahl experiment. What theoretically possible mode of DNA replication can be excluded after one round of replication?
| 1. | Conservative | 2. | Semiconservative |
| 3. | Disruptive | 4. | Both 1 and 3 |
Subtopic: DNA Replication |
63%
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Consider the following statements:
| I. | Deoxyribonucleoside triphosphates act as substrates as well as provide energy for polymerization reaction during DNA replication. |
| II. | The replication of DNA is both semiconservative and semi-discontinuous |
| III. | In bacterial DNA replication, there are multiple ori and replication fork moving bi-directionally |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
Subtopic: DNA Replication: I | DNA Replication: II | DNA Replication |
57%
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Consider the following statements:
| I: | The VNTRs belong to a class of satellite DNA called as mini-satellite. |
| II: | Southern blotting is the transfer of DNA fragments to a filter cellulose membrane. |
| III: | VNTRs are used in DNA fingerprinting as they do not show any variations and are not inherited. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Subtopic: DNA Fingerprinting |
71%
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Consider the following statements:
| I: | The unequivocal proof of DNA being the genetic material was given by Hershey and Chase. |
| II: | Meselson and Stahl proposed that DNA replication is semi-conservative. |
| III: | Beadle and Tatum proposed the one -gene - one - enzyme hypothesis. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Subtopic: Search for Genetic Material: II | DNA Replication |
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Consider the following statements:
| I: | All the reference point while defining a transcription unit is made with the coding strand. |
| II: | It is the presence of a promoter in a transcription unit that also defines the template and coding strands. |
| III: | Exons are said to be sequences that do not appear in mature or processed RNA. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Subtopic: Transcription |
79%
From NCERT
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