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Q. No.If E. coli is growth in the absence of lactose, it will stop the synthesis of
1. Ribonuclease
2. \(\beta\)-lactamase
3. \(\beta\)-galactosidase
4. Pyruvate kinase
Subtopic: Gene Regulation: Lac Operon |
90%
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Match List I with List II
Choose the correct answer from the options given below:
1. A-IV, B-I, C-III, D-I
2. A-III, B-II, C-IV, D-I
3. A-III, B-II, C-I, D-IV
4. A-III, B-I, C-IV, D-II
| List I | List II |
| A. Fredrich Miescher | I. Used X-ray analysis to investigate DNA structure |
| B. Rosalind Franklin | II. Provided experiment evidence of semiconservative DNA replication |
| C. James Watson | III. Discovered DNA |
| D. Mathew Meselson | IV. Elucidated 3-dimensional double helix DNA structure |
1. A-IV, B-I, C-III, D-I
2. A-III, B-II, C-IV, D-I
3. A-III, B-II, C-I, D-IV
4. A-III, B-I, C-IV, D-II
Subtopic: Genetic Code |
From NCERT
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E.coli growing in a medium containing radioactive thymidine was allowed to grow in normal medium (without radioactive thymidine) for two generations. What percentage of bacteria will have radioactive DNA strand?
1. 100%
2. 50%
3. 25%
4. 12.5%
1. 100%
2. 50%
3. 25%
4. 12.5%
Subtopic: DNA Replication |
69%
From NCERT
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The sequence of a DNA strand is 3'TTCGCATG 5'. The sequence of the complementary strand will be
1. 5'AAGCGTAC 3'
2. 5'CATGCGAA 3'
3. 5'CATGCGAA 3'
4. 3'CATGCGAA 5'
1. 5'AAGCGTAC 3'
2. 5'CATGCGAA 3'
3. 5'CATGCGAA 3'
4. 3'CATGCGAA 5'
Subtopic: DNA Replication |
90%
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Post-transcriptional modifications in eukaryotes include
1. Polyadenylation, capping, coding
2. Capping, splicing, coding
3. Coding, splicing, polyadenylation
4. Capping, splicing, polyadenylation
1. Polyadenylation, capping, coding
2. Capping, splicing, coding
3. Coding, splicing, polyadenylation
4. Capping, splicing, polyadenylation
Subtopic: Transcription |
74%
From NCERT
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Which of the following is required as inducer(s) for the expression of Lac operon?
1. Galactose
2. Lactose
3. Lactose and galactose
4. Glucose
1. Galactose
2. Lactose
3. Lactose and galactose
4. Glucose
Subtopic: Gene Regulation: Lac Operon |
90%
From NCERT
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Which of the following is the main enzyme required for transcription?
1. DNA dependent DNA polymerase
2. DNA dependent RNA polymerase
3. RNA dependent RNA polymerase
4. RNA dependent DNA polymerase
1. DNA dependent DNA polymerase
2. DNA dependent RNA polymerase
3. RNA dependent RNA polymerase
4. RNA dependent DNA polymerase
Subtopic: Transcription |
82%
From NCERT
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In lac operon, z gene codes for :
1. \(\beta -\)galactosidase
2. Permease
3. Repressor
4. Transacetylase
1. \(\beta -\)galactosidase
2. Permease
3. Repressor
4. Transacetylase
Subtopic: Gene Regulation: Lac Operon |
90%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
Match List-I with List- II
Choose the correct answer from the options given below :
| List-I | List-II | ||
| (a) | In lac operon i gene codes for | (i) | transacetylase |
| (b) | In lac operon z gene codes for | (ii) | permease |
| (c) | In lac operon y gene codes for | (iii) | \(\beta-\)galactosidase |
| (d) | In lac operon a gene codes for | (iv) | Repressor |
Choose the correct answer from the options given below :
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (ii) | (i) | (iv) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (iv) | (i) | (iii) | (ii) |
| 4. | (iii) | (i) | (iv) | (ii) |
Subtopic: Gene Regulation: Lac Operon |
91%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
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NEET 2025 - Target Batch
Given below are two statements:
In the light of the above statements, choose the correct answer from the options given below:
1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.
| Statement I: | DNA polymerases catalyse polymerisation only in one direction, that is 5' →3' |
| Statement II: | During replication of DNA, on one strand the replication is continuous while on other strand it is discontinuous. |
1. Both Statement I and Statement II are correct.
2. Both Statement I and Statement II are incorrect.
3. Statement I is correct but Statement II is incorrect.
4. Statement I is incorrect but Statement II is correct.
Subtopic: DNA Replication |
86%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
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NEET 2025 - Target Batch
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