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Q. No.The double helix model for the structure of DNA proposed by Watson and Crick was based on
1. Visible light spectrum analysis
2. Chromatography
3. X-ray diffraction data
4. Autoradiography
Subtopic: The DNA |
91%
From NCERT
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In a nucleotide, a phosphate group is linked to ___(i)___ of a nucleoside through ___(ii)___
Select the correct option to fill in the blanks (i) and (ii)
1. (i) OH of 3'C (ii) Hydrogen bond
2. (i) OH of 5'C (ii) Phosphoester linkage
3. (I) 3' - C, (ii) Peptide bond
4. (i) OH of 5'C (ii) Glycosidic linkage
Select the correct option to fill in the blanks (i) and (ii)
1. (i) OH of 3'C (ii) Hydrogen bond
2. (i) OH of 5'C (ii) Phosphoester linkage
3. (I) 3' - C, (ii) Peptide bond
4. (i) OH of 5'C (ii) Glycosidic linkage
Subtopic: The DNA |
83%
From NCERT
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Select the incorrect statement regarding the salient features of the double-helix structure of DNA
1. It is made of two polynucleotide chains
2. The two chains have anti-parallel polarity
3. Guanine is bonded with thymine by three H-bonds
4. The two chains are coiled in a right-handed fashion
1. It is made of two polynucleotide chains
2. The two chains have anti-parallel polarity
3. Guanine is bonded with thymine by three H-bonds
4. The two chains are coiled in a right-handed fashion
Subtopic: DNA Double Helix |
89%
From NCERT
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If there is a flow of information from RNA to DNA then this process will be named as
1. Reverse transcription
2. Translation
3. Replication
4. Transformation
1. Reverse transcription
2. Translation
3. Replication
4. Transformation
Subtopic: The DNA |
89%
From NCERT
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A nucleosome is composed of
1. Positively charged DNA and negatively charged histone octamer
2. A negatively charged H1 histone and positively charged DNA molecule
3. Negatively charged DNA and positively charged histone octamer
4. Negatively charged lysines and positively charged arginine amino acids
1. Positively charged DNA and negatively charged histone octamer
2. A negatively charged H1 histone and positively charged DNA molecule
3. Negatively charged DNA and positively charged histone octamer
4. Negatively charged lysines and positively charged arginine amino acids
Subtopic: DNA Packaging |
89%
From NCERT
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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
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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