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Q. No.Matthew Meselson and Franklin Stahl , in1958, demonstrated that DNA replication produces two daughter DNA molecules each composed of:
1. two old strands
2. two new strands
3. one old and one new strand
4. two strands with variable proportion of new and old DNA
Subtopic: Search for Genetic Material: II |
86%
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Consider the given two statements:
| Assertion: | On one strand (the template with polarity 3'→5'), the replication is continuous, while on the other (the template with polarity 5'→3'), it is discontinuous. |
| Reason: | The DNA-dependent DNA polymerases catalyse polymerisation only in one direction, that is 3'→5'. |
| 1. | Both Assertion and Reason are true but Reason does not correctly explain the Assertion. |
| 2. | Assertion is true but Reason is False. |
| 3. | Assertion is false but Reason is True. |
| 4. | Both Assertion and Reason are true and Reason correctly explains the Assertion. |
Subtopic: DNA Replication: II |
73%
From NCERT
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While defining the two strands of the DNA in the structural gene of a transcription unit the coding strand is the one that:
1. has the polarity 3'→5'
2. has the sequence same as RNA (except uracil at the place of thymine)
3. is displaced during transcription
4. codes for the transcript formed
1. has the polarity 3'→5'
2. has the sequence same as RNA (except uracil at the place of thymine)
3. is displaced during transcription
4. codes for the transcript formed
Subtopic: Transcription:II |
From NCERT
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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%
From NCERT
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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%
From NCERT
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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 |
90%
From NCERT
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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%
From NCERT
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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 |
59%
From NCERT
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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 |
78%
From NCERT
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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 |
90%
From NCERT
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