Consider the given two statements:
Statement I:
The structural gene in a transcription unit is monocistronic, mostly, in bacteria or prokaryotes.
Statement II:
The structural gene in a transcription unit is polycistronic, mostly, in eukaryotes.
1.
Statement I is correct; Statement II is correct
2.
Statement I is correct; Statement II is incorrect
3.
Statement I is incorrect; Statement II is incorrect
4.
Statement I is incorrect; Statement II is correct
Subtopic: Transcription:II |
80%
Level 1: 80%+
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Regarding bacterial RNA polymerase:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | There is a single DNA-dependent RNA polymerase that catalyzes the transcription of all types of RNA. |
| II: | RNA polymerase associates transiently with initiation-factor (σ) and termination-factor (ρ) to initiate and terminate the transcription, respectively. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Transcription:II |
86%
Level 1: 80%+
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In eukaryotic transcription:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | There are at least three RNA polymerases in the nucleus (in addition to the RNA polymerase found in the organelles). |
| II: | hnRNA undergoes modification to produce mature RNA. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Transcription:II |
89%
Level 1: 80%+
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How many of the following statements regarding the salient features of genetic code are true?
1. 3
2. 4
3. 5
4. 6
| I: | The codon is triplet. |
| II: | 61 codons code for amino acids and 3 codons do not code for any amino acids. |
| III: | The code is degenerate. |
| IV: | There are punctuations when reading the code. |
| V: | The code is nearly universal. |
| VI: | AUG has dual functions. |
2. 4
3. 5
4. 6
Subtopic: Genetic Code: II |
82%
Level 1: 80%+
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Identify the correct statements regarding the tRNA molecule:
1. Only a, b and c
2. Only a, c and d
3. Only b, c and d
4. a, b, c, and d
| a. | tRNA has an anticodon loop that has bases complementary to the code. |
| b. | tRNA has an amino acid acceptor end at the 5’ end to which it binds to amino acids. |
| c. | tRNAs are specific for each amino acid. |
| d. | There are no tRNAs for stop codons. |
2. Only a, c and d
3. Only b, c and d
4. a, b, c, and d
Subtopic: Transcription:II |
61%
Level 2: 60%+
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The clover leaf model structure describes the:
| 1. | the secondary structure of tRNA. |
| 2. | the actual structure of tRNA. |
| 3. | the assembly of tRNAs at the larger subunit of ribosomes |
| 4. | motifs formed by unusual bases in tRNA. |
Subtopic: Translation Mechanism |
79%
Level 2: 60%+
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The UTRs in a mature eukaryotic mRNA:
| 1. | are present at both 5'-end (before start codon) and at 3'-end (after stop codon). |
| 2. | are present only at 5'-end (before start codon). |
| 3. | are present only at 3'-end (after stop codon). |
| 4. | are absent but are present in hnRNA. |
Subtopic: Transcription: IV |
91%
Level 1: 80%+
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Consider the given two statements:
1. Both I and II are correct
2. Only II is correct
3. Only I is correct
4. Both I and II are incorrect
| Statement I: | A transcription unit in DNA is the structural gene that is flanked by the promoter and the terminator. |
| Statement II: | A translational unit in mRNA is the sequence of RNA that is flanked by the start codon (AUG) and the stop codon |
1. Both I and II are correct
2. Only II is correct
3. Only I is correct
4. Both I and II are incorrect
Subtopic: Transcription:II |
85%
Level 1: 80%+
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Among the given possible levels of regulation of gene expression:
(i) transcriptional level (formation of primary transcript),
(ii) processing level (regulation of splicing),
(iii) transport of mRNA from nucleus to the cytoplasm,
I: (i) is the predominant site for regulation of gene expression in prokaryotes.
II: (ii) and (iii) are possible only in eukaryotes.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
(i) transcriptional level (formation of primary transcript),
(ii) processing level (regulation of splicing),
(iii) transport of mRNA from nucleus to the cytoplasm,
I: (i) is the predominant site for regulation of gene expression in prokaryotes.
II: (ii) and (iii) are possible only in eukaryotes.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Transcription:II |
84%
Level 1: 80%+
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In a transcription unit, the activity of RNA polymerase at a given promoter is regulated by interaction with accessory proteins called:
1. Enhancers and Silencers
2. Operators and CAP
3. Rho factors and Sigma factors
4. Activators and Repressors
1. Enhancers and Silencers
2. Operators and CAP
3. Rho factors and Sigma factors
4. Activators and Repressors
Subtopic: Transcription:II |
Level 4: Below 35%
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