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Q. No.Hallmark of the Watson and crick three dimensional DNA model was based upon the finding of
1. Wilkins and Franklin
2. Erwin chargaff
3. Hershey and chase
4. Meselson and stahi
Subtopic: DNA Double Helix |
From NCERT
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Choose the correct steps in the organisation of eukaryotic chromosome
| 1. | Nucleosome | → | Solenoid | → | Supersolenoid |
| 2. | Solenoid | → | Nucleosome | → | Chromatid |
| 3. | DNA | → | Solenoid | → | Nucleosome |
| 4. | Chromatin | → | Solenoid | → | Nucleosome |
Subtopic: DNA Packaging |
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Heterochromatin
1. Is transcriptionally active
2. Is densely packed
3. Replicated during early S-phase
4. Stains lightly
1. Is transcriptionally active
2. Is densely packed
3. Replicated during early S-phase
4. Stains lightly
Subtopic: DNA Packaging |
90%
From NCERT
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The number of glycosidic bonds associated with DNA of diploid human cell are
1. \(6.6 \times 10^9\)
2. \(2 \times 6.6 \times 10^9\)
3. \(3.3 \times 10^9 \)
4. \(3.3 \times 10^9-2\)
1. \(6.6 \times 10^9\)
2. \(2 \times 6.6 \times 10^9\)
3. \(3.3 \times 10^9 \)
4. \(3.3 \times 10^9-2\)
Subtopic: DNA Double Helix |
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Which of the following does not confer stability to the helical structure of DNA?
1. Phosphodiester bond
2. H-bond
3. N-glycosidic linkage
4. Both (1) & (2)
1. Phosphodiester bond
2. H-bond
3. N-glycosidic linkage
4. Both (1) & (2)
55%
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Which of the following type of bacteria were used in Griffith's transformation experiment?
1. Diplococcus, R-lll and S-ll type
2. Pneumococcus, T2 phage
3. Streptococcus, R-ll and S-lll type
4. Diplococcus, E coli
1. Diplococcus, R-lll and S-ll type
2. Pneumococcus, T2 phage
3. Streptococcus, R-ll and S-lll type
4. Diplococcus, E coli
72%
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The biochemical nature of transforming principle was defined by
1. Griffith
2. Avery, Macleod, McCarty
3. Watson and Crick
4. Taylor
1. Griffith
2. Avery, Macleod, McCarty
3. Watson and Crick
4. Taylor
73%
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In Hershey and Chase experiment, the protein of T2 phage was radioactive by using
1. S32
2. P31
3. S35
4. P32
1. S32
2. P31
3. S35
4. P32
57%
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Choose the correct option w.r.t. RNA.
1. Presence of thymine in place of uracil
2. Absence of free 2'OH in sugar
3. Mutates at faster rate
4. Is non-catalytic
1. Presence of thymine in place of uracil
2. Absence of free 2'OH in sugar
3. Mutates at faster rate
4. Is non-catalytic
72%
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Semiconservative DNA replication was proved by Messelson and Stahl, in which DNA was made
1. Radioactive using \(\mathrm{N}^{15}\)
2. Heavy using\(\mathrm{N}^{14}\)
3. Heavy using \({ }^{15} \mathrm{NH}_4 \mathrm{Cl}\)
4. Radioactive using \({ }^{14} \mathrm{NH}_4 \mathrm{Cl}\)
1. Radioactive using \(\mathrm{N}^{15}\)
2. Heavy using\(\mathrm{N}^{14}\)
3. Heavy using \({ }^{15} \mathrm{NH}_4 \mathrm{Cl}\)
4. Radioactive using \({ }^{14} \mathrm{NH}_4 \mathrm{Cl}\)
69%
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