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%

Subtopic:  DNA Replication |
 69%
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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'
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 
Subtopic:  Transcription |
 74%
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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 
Subtopic:  Gene Regulation: Lac Operon |
 90%
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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 
Subtopic:  Transcription |
 82%
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In lac operon, z gene codes for :
1. \(\beta -\)galactosidase
2. Permease
3. Repressor
4. Transacetylase
Subtopic:  Gene Regulation: Lac Operon |
 90%
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NEET - 2022
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Match List-I with List- II
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%
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NEET - 2022
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Given below are two statements:
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.
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.
Subtopic:  DNA Replication |
 86%
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NEET - 2022
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Match List-I with List-II
List- I List-II
(a) Bacteriophage \(\phi \times 174\) (i) 48502 base pairs
(b) Bacteriophage lambda (ii) 5386 nucleotides
(c) Escherichia coli (iii) 3.3 × 109 base pairs
(d) Haploid content  human DNA (iv) 4.6 × 106 base pairs of

Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (i) (ii) (iii) (iv)
2. (ii) (iv) (i) (iii)
3. (ii) (i) (iv) (iii)
4. (i) (ii) (iv) (iii)
Subtopic:  The DNA |
 81%
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NEET - 2022
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If DNA contained sulphur instead of phosphorus and proteins contained phosphorus instead of sulfur, what would have been the outcome of Hershey and Chase experiment?
1. No radioactive sulfur in bacterial cells
2. Both radioactive sulfur and phosphorus in bacterial cells
3. Radioactive sulfur in bacterial cells
4. Radioactive phosphorus in bacterial cells
Subtopic:  Search for Genetic Material |
 72%
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NEET - 2022
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