- 1(current)
Q. No.Given below in Column I are the criteria for a molecule that can act as a genetic material and the corresponding inferences drawn are given in Column II. Identify the criteria that is not correctly matched to the inference drawn:
|
|
Criteria |
Inference drawn |
|
1. |
It should be able to replicate |
Protein cannot be the genetic material |
|
2. |
It should be stable structurally and chemically |
DNA is a better genetic material than RNA |
|
3. |
It should provide the scope for slow changes |
RNA evolves faster than DNA |
|
4. |
It should be able to express in the form of Mendelian characters |
The protein synthesizing machinery has evolved around DNA |
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Consider the given two statements:
| I: | Among the two nucleic acids DNA is a better genetic material. |
| II: | The protein synthesizing machinery has evolved around RNA and not DNA. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | Both I and II are incorrect |
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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 |
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Identify the incorrect match between the scientists in Column I with their contributions in Column II:
|
|
COLUMN I |
COLUMN II |
|
1. |
Frederick Griffith |
Discovery of bacterial transformation |
|
2. |
Meselson and Stahl |
Proposed semi-conservative mode of DNA replication based on complementary base pairing and antiparallel strands |
|
3. |
Avery, Macleod, and McCarty |
Purified the transforming principle and found it to be DNA |
|
4. |
Erwin Chargaff |
In natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units |
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| I. Proteins | II. DNA | III. RNA |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
The RNA world is a hypothetical stage in the evolutionary history of life on Earth, in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. The properties of RNA make the idea of the RNA world hypothesis conceptually plausible and include:
I. RNA is known to form efficient catalysts
II. Its similarity to DNA makes clear its ability to store information
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
- 1(current)
Q. No.
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