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Q. No.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)
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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During DNA replication, strand separation by breaking the H-bonds is performed by
1. DNA ligase
2. DNA polymerase
3. Helicases
4. RNA primase
1. DNA ligase
2. DNA polymerase
3. Helicases
4. RNA primase
71%
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Which of the following acts as substrate as well as provide energy for DNA polymerisation?
1. Ribonucleoside
2. Deoxyribonucleoside
3. Ribonucleotide
4. Deoxyribonucleoside triphosphate
1. Ribonucleoside
2. Deoxyribonucleoside
3. Ribonucleotide
4. Deoxyribonucleoside triphosphate
73%
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DNA replication is
1. Semi-conservative, continuous, unidirectional
2. Conservative, continuous
3. Semi-conservation, semi-discontinuous
4. Semi-continuous, conservative
1. Semi-conservative, continuous, unidirectional
2. Conservative, continuous
3. Semi-conservation, semi-discontinuous
4. Semi-continuous, conservative
Subtopic: DNA Replication |
87%
From NCERT
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Which of the following is a genetic RNA?
1. mRNA
2. rRNA
3. hn-RNA
4. RAN present in plant viruses
1. mRNA
2. rRNA
3. hn-RNA
4. RAN present in plant viruses
Subtopic: Transcription |
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