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Q. No.In the experiment conducted by Griffith when a mixture of heat killed S-strain and live R-strain of Pneumococcus bacteria was injected into a healthy mice, it developed pneumonia. This was due to
1. Reactivation of S-strain bacteria
2. Transformation of S-strain bacteria into R-strain bacteria
3. Synthesis of polysaccharide coat around heat killed S-strain bacteria
4. Transformed R-strain bacteria
Subtopic: Search for Genetic Material |
54%
From NCERT
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A radioactive sulphur containing bacteriophage is allowed to attach to E. coli that contains radioactive phosphorus. The viruses produced in this bacteria by this infection will have
1. Radioactive protein capsule and non-radioactive genetic material
2. Radioactive protein capsule and radioactive genetic material
3. Non-radioactive protein capsule and radioactive genetic material
4. Non-radioactive protein capsule and non-radioactive genetic material
1. Radioactive protein capsule and non-radioactive genetic material
2. Radioactive protein capsule and radioactive genetic material
3. Non-radioactive protein capsule and radioactive genetic material
4. Non-radioactive protein capsule and non-radioactive genetic material
Subtopic: Search for Genetic Material |
57%
From NCERT
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The discontinuously synthesised fragments of DNA are joined by the enzyme
1. DNA ligase
2. DNA-dependent DNA polymerase
3. Phosphorylase
4. Topoisomerase
1. DNA ligase
2. DNA-dependent DNA polymerase
3. Phosphorylase
4. Topoisomerase
Subtopic: DNA Replication |
89%
From NCERT
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If E. coli completes the process of DNA replication within 38 minutes then the rate of polymerisation of DNA would be approximately
1. \(4.6 \times 10^6\) bp/second
2. 500 bp/second
3. 230 bp/second
4. 2000 bp/second
1. \(4.6 \times 10^6\) bp/second
2. 500 bp/second
3. 230 bp/second
4. 2000 bp/second
Subtopic: DNA Replication |
63%
From NCERT
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In a transcription unit, the promoter is located towards
1. 5' end of the templates strand
2. 5' end of the coding strand
3. 3' end of the non-template strand
4. 3' end of the sense strand
1. 5' end of the templates strand
2. 5' end of the coding strand
3. 3' end of the non-template strand
4. 3' end of the sense strand
Subtopic: Transcription |
78%
From NCERT
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If the sequence of bases in one of the DNA strand is A G G A G A A, then the sequence of bases in the other complementary strand of DNA would be
1. C C T T C T T
2. T C T C T C C
3. T C C T C T T
4. C C T C T C T
1. C C T T C T T
2. T C T C T C C
3. T C C T C T T
4. C C T C T C T
Subtopic: DNA Replication | Transcription |
93%
From NCERT
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A hypothetical sequence of a transcription unit is represented below
3'C G G A T A T C C A A T-5' Template strand
5' G C C T A T A G G T T A-3' Coding strand
If we switch the position of promoter with terminator in the above given transcription unit and transcriotion occurs then the sequence of RNA transcribed will be
1. 5'-C G G A U A U C C A A U-3'
2. 5'-G C C U A U A G G U U A-3'
3. 5'-A U U G G A U A U C C G-3'
4. 5'-U A A C C U A U A G G C-3'
3'C G G A T A T C C A A T-5' Template strand
5' G C C T A T A G G T T A-3' Coding strand
If we switch the position of promoter with terminator in the above given transcription unit and transcriotion occurs then the sequence of RNA transcribed will be
1. 5'-C G G A U A U C C A A U-3'
2. 5'-G C C U A U A G G U U A-3'
3. 5'-A U U G G A U A U C C G-3'
4. 5'-U A A C C U A U A G G C-3'
Subtopic: Transcription |
From NCERT
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Select the incorrect statement from the following
1. In most of the eukaryotes, the structural gene in monocistronic
2. Exons are the expressed sequence of genes
3. Introns do not appear in processed RNA
4. A gene does not code for tRNA
1. In most of the eukaryotes, the structural gene in monocistronic
2. Exons are the expressed sequence of genes
3. Introns do not appear in processed RNA
4. A gene does not code for tRNA
Subtopic: Transcription |
75%
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Subtopic: DNA Double Helix |
91%
From NCERT
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In eukaryotes, rRNAs are transcribed by
1. RNA polymerase I and III
2. RNA polymerase III only
3. RNA polymerase I and II
4. RNA polymerase I only
1. RNA polymerase I and III
2. RNA polymerase III only
3. RNA polymerase I and II
4. RNA polymerase I only
Subtopic: Transcription |
From NCERT
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