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Q. No.In eukaryotes, RNA polymerase I transcribes all the following except:
1.
28S rRNA
2.
8S rRNA
3.
5.8S rRNA
4.
5S rRNA
Subtopic: Transcription: I |
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Identify the correctly matched pairs:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| Scientist | Contribution in deciphering genetic code | |
| I: | Hargobind Khorana | Developed chemical method for synthesising RNA molecules with defined combinations of bases. |
| II: | Marshall Nirenberg | Created cell-free system to facilitate study. |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Genetic Code |
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Subtopic: Genetic Code |
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All three major cellular RNAs are needed to synthesise a protein in a cell where:
1. Only I is correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | mRNA provides the template |
| II: | tRNA brings amino acids and reads the genetic code |
| III: | rRNAs play structural and catalytic role during translation |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Transcription |
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A gene:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | is defined as the functional unit of inheritance. |
| II: | can also be defined as DNA sequences coding for tRNA or rRNA. |
| III: | can also be defined as certain regulatory sequences. |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Gene Regulation: Introduction |
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Consider the given two statements:
| Assertion (A): | From the very beginning of the proposition of code, it was clear to Francis Crick that there has to be a mechanism to read the code and also to link it to the amino acids. |
| Reason (R): | The tRNA is the adapter molecule. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: Transcription |
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Consider the given two statements:
| Assertion (A): | The order and sequence of amino acids in a polypeptide are defined by the sequence of bases in the mRNA. |
| Reason (R): | The mRNA is formed in a template independent manner in eukaryotes. |
| 1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True and (R) correctly explains (A). |
Subtopic: Translation |
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How many of the given statements regarding ribosomes are correct?
1. 1
2. 2
3. 3
4. 4
| I: | Ribosomes are the cellular factory responsible for synthesising proteins. |
| II: | The ribosome consists of structural RNAs and about 800 different proteins. |
| III: | In its inactive state, it exists as two subunits; a large subunit and a small subunit. |
| IV: | When the small subunit encounters an mRNA, the process of translation of the mRNA to protein begins. |
2. 2
3. 3
4. 4
Subtopic: Translation |
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In the presence of an inducer, such as lactose or allolactose:
| 1. | the repressor of lac operon is activated allowing RNA polymerase access to the promoter and transcription proceeds. |
| 2. | the repressor of lac operon is inactivated preventing RNA polymerase access to the promoter and transcription stops. |
| 3. | the repressor of lac operon is inactivated allowing RNA polymerase access to the promoter and transcription proceeds. |
| 4. | the repressor of lac operon is activated allowing RNA polymerase access to the promoter and transcription stops. |
Subtopic: Gene Regulation: Lac Operon |
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In an operon:
| 1. | a polycistronic structural gene is regulated by a common promoter and regulatory genes. |
| 2. | the regulation in gene expression is always negative and inducible. |
| 3. | the number of structural genes in eukaryotes is much higher than the number of genes in prokaryotic operon. |
| 4. | the role of RNA polymerase is actually performed by accessory proteins like activators and repressors |
Subtopic: Gene Regulation: Lac Operon |
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