Q. No.Which one of the following is not a criterion of genetic material?
| 1. | Should not provide the scope for changes for evolution |
| 2. | Should be able to express itself in the form of Mendelian character |
| 3. | Should be able to generate its replica |
| 4. | Should be stable chemically and structurally |
DNA replication is semi-conservative in nature was experimentally proved in eukaryotes by:
| 1. | Hershey and Chase | 2. | Macleod and McCarty |
| 3. | Meselson and Stahl | 4. | Talyor and his colleagues |
Which one of the following experiments of Frederick Griffith resulted in the discovery of bacterial transformation?
| 1. | S-stain(heat-killed) → injected in to Mice → Mice lived |
| 2. | S-strain (heat killed) + R-strain(live) →injected in to Mice → Mice died |
| 3. | S-stain → injected in to Mice → Mice died |
| 4. | R-strain → injected in to Mice → Mice lived |
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Semiconservative replication was experimentally proved by Mathew Meselson and Franklin Stahl (1958). |
| Reason (R): | Meselson and Stahl used radioactive isotope \(^{15}N\) and equilibrium density gradient centrifugation technique. |
In the light of the above statements, choose the correct answer from the options given below:
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
With respect to nucleosome, Which of the following statements is incorrect ?
| 1. | Nucleosome contains 120 bp of DNA helix |
| 2. | Nucleosomes are seen as 'beads' on string' under Electron Microscope |
| 3. | DNA is wrapped around positively charged histone octamer to form nucleosome. |
| 4. | Nucleosome it the repeating unit of chromatin |
One of the strands of double stranded DNA has base composition as follows: 15% A, 15% T, 40%G and 30%C. What will be the percentage of these bases in the complementary strand ?
1. 15% A, 15% T, 30% G , 40% C
2. 15% A, 30% T, 40% G , 15% C
3. 15% A, 15% T, 40% G , 30% C
4. 15% A, 40% T, 15% G , 30% C
What would be the proportions of light and hybrid density DNA molecule, respectively if Meselson and Stahl's experiment was continued for 60 minutes ?
| 1. | 50%, 50% | 2. | 25%, 75% |
| 3. | 75%, 25% | 4. | 100%, 0% |
| 1. | 1 | 2. | 3 |
| 3. | 2.5 | 4. | 2 |
| List -I | List -II |
| (a) In lac operon i gene codes for | (i) transacetylase |
| (b) In lac operon z gene codes for | (ii) permease |
| (c) In lac operon y gene codes for | (iii) \(\beta-\)galactosidase |
| (d) In lac operon a gene codes for | (iv) Repressor |
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (ii) | (i) | (iv) |
| 2. | (iv) | (iii) | (ii) | (i) |
| 3. | (iv) | (i) | (iii) | (ii) |
| 4. | (iii) | (i) | (iv) | (ii) |
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