Q. No.Which histone is represented by the letter X in the given diagram?
1.
H 1
2.
H 2 A
3.
H 2 B
3.
H 3
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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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Study the results of the Meselson and Stahl experiment. What theoretically possible mode of DNA replication can be excluded after one round of replication?
2. Semiconservative
3. Disruptive
4. Both 1 and 3
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Which of the following cannot be inferred from the information given in the following diagram?
| 1. | The DNA from the crime scene matches that of individual B |
| 2. | VNTRs are hypervariable |
| 3. | The larger fragments remain near the point of introduction in the gel electrophoresis |
| 4. | The smaller chromosomes in the human genome have smaller repeats of VNTR |
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Consider the following statements:
| I: | The cellular factory responsible for synthesizing proteins is the ribosome. |
| II: | The ribosome also acts as a catalyst for the formation of a peptide bond. |
| III: | The UTRs (untranslated regions) in an mRNA are not required for translation. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Consider the following statements:
| I: | The VNTRs belong to a class of satellite DNA called as mini-satellite. |
| II: | Southern blotting is the transfer of DNA fragments to a filter cellulose membrane. |
| III: | VNTRs are used in DNA fingerprinting as they do not show any variations and are not inherited. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Consider the following statements:
| I: | The unequivocal proof of DNA being the genetic material was given by Hershey and Chase. |
| II: | Meselson and Stahl proposed that DNA replication is semi-conservative. |
| III: | Beadle and Tatum proposed the one -gene - one - enzyme hypothesis. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Consider the following statements:
| I: | Inheritance of a character is affected by the promoter and regulatory sequences of a structural gene. |
| II: | The split-gene arrangement represents an ancient feature of the genome. |
| III: | The process of splicing represents the dominance of the RNA world. |
Which of the above statements are true?
| 1. | I and II only |
| 2. | I and III only |
| 3. | II and III only |
| 4. | I, II, and III |
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The DNA profiles below represent four different individuals. Which of the following statements is consistent with the results?
1. B is the child of A and C.
2. C is the child of A and B.
3. D is the child of B and C.
4. A is the child of B and C.
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Match each item in Column I with one item in Column II and chose your answer from the codes given below:
|
Column I (Scientist) |
Column II (Contribution) |
|
I. Hargobind Khorana II. Norman Borlaug III. Cohen and Boyer IV. Ian Wilmut |
1. Green revolution 2. First man-made gene 3. First cloned mammal 4. rDNA technology |
| Codes: | I | II | III | IV |
| 1. | 1 | 2 | 3 | 4 |
| 2. | 2 | 1 | 4 | 3 |
| 3. | 2 | 1 | 3 | 4 |
| 4. | 1 | 2 | 4 | 3 |
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