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Q. No.The size of VNTR [used in DNA fingerprinting] varies from:
1. 0.1 to 20 kb 2. 20 to 30 kb 3. 50 to 100 kb 4. 115 to 215 kb
Subtopic: DNA Fingerprinting |
82%
From NCERT
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E.coli has only 4.6 × base pairs and completes the process of replication within 18 minutes, then the average rate of polymerization is approximately:
| 1. | 2000 base pairs/second | 2. | 3000 base pairs/second |
| 3. | 4000 base pairs/second | 4. | 1000 base pairs/second |
Subtopic: DNA Replication: I |
77%
From NCERT
NEET - 2020
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The salient features of the human genome include all of the following except:
| 1. | The functions are unknown for over 50 % of the discovered genes. |
| 2. | More than 2 % of the genome codes for proteins. |
| 3. | Chromosome 1 has the most genes. |
| 4. | Repeated sequences make up a very large portion of the human genome. |
Subtopic: Human Genome Project |
76%
From NCERT
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In the human genome, the chromosomes with the most and the fewest genes located on them respectively are:
| 1. | 1 and Y | 2. | X and Y |
| 3. | 21 and X | 4. | 11 and Y |
Subtopic: Human Genome Project |
78%
From NCERT
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What catalyzes the peptide bond formation in prokaryotes?
1. Proteases
2. A ribozyme
3. Sigma subunit of RNA polymerase
4. Rho factor proteins
Subtopic: Gene Regulation: Introduction |
71%
From NCERT
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The genetic material for the first life on the earth was probably:
| 1. | ds DNA | 2. | ss DNA |
| 3. | Protein | 4. | RNA |
Subtopic: DNA vs RNA as Genetic Material |
90%
From NCERT
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Identify the correct statements regarding salient features of the Double-helix structure of DNA:
| I: | Backbone is constituted by nitrogenous bases. |
| II: | The two chains have anti-parallel polarity. |
| III. | There is complementary base pairing between nitrogenous bases. |
| IV. | The two chains are coiled in a left-handed fashion. |
| V. | The plane of one base pair stacks over the other. |
| 1. | All except I | 2. | All except I and IV |
| 3. | Only II and III | 4. | Only III |
Subtopic: DNA Double Helix |
72%
From NCERT
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Subtopic: DNA Fingerprinting |
85%
From NCERT
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Which of the following two statements can be correctly considered as the conclusions of the Hershey and Chase experiment?
| I: | The lack of 35S-labeled DNA remaining in the solution after the bacteriophages had been allowed to adsorb to the bacteria showed that the phage DNA was transferred into the bacterial cell. |
| II: | The presence of almost all the radioactive 32P in the solution showed that the protein coat that protects the DNA before adsorption stayed outside the cell. |
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Subtopic: Search for Genetic Material |
52%
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In Hershey and Chase experiment:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Radioactive sulfur-35 was used to label the DNA contained in the T2 phage |
| II: | Radioactive phosphorus-32 was used to label the protein sections of the T2 phage |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Search for Genetic Material |
75%
From NCERT
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