The salient features of the Double-helix structure of DNA include all the following except:
1.
It is made of two polynucleotide chains, where the backbone is constituted by sugar-phosphate, and the bases project inside.
2.
The two chains have anti-parallel polarity.
3.
The bases in two strands are paired through hydrogen bonds (H-bonds) forming base pairs (bp).
4.
The two chains are coiled in a left-handed fashion.
Subtopic: Â DNA Double Helix |
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There is now enough evidence to suggest that essential life processes (such as metabolism, translation, splicing, etc.), evolved around:
| 1. | DNA | 2. | RNA |
| 3. | Proteins | 4. | Lipids |
Subtopic: Â DNA Fingerprinting |
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A transcription unit in DNA is defined primarily by the three regions in the DNA which include all the following except:
1. A promoter
2. An operator
3. Structural gene
4. A terminator
1. A promoter
2. An operator
3. Structural gene
4. A terminator
Subtopic: Â Transcription |
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The earlier technique of DNA fingerprinting involved Southern blot and all the following except:
| 1. | digestion of DNA by deoxyribonuclease |
| 2. | separation of DNA fragments by electrophoresis |
| 3. | hybridisation using labelled VNTR probe |
| 4. | detection of hybridised DNA fragments by autoradiography |
Subtopic: Â DNA Fingerprinting |
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Which histone is not a part of the octamer that forms the core of histone molecules in a nucleosome?
1. H1
2. H2A
3. H2B
3. H3
1. H1
2. H2A
3. H2B
3. H3
Subtopic: Â DNA Packaging |
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Consider the two statements:
| Assertion (A): | It is necessary to define the boundaries that would demarcate the region and the strand of DNA that would be transcribed. |
| Reason (R): | In transcription, only a segment of DNA and only one of the strands is copied into RNA. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Transcription |
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Consider the two statements:
| Assertion (A): | When Griffith injected a mixture of heat-killed S and live R bacteria, the mice died. |
| Reason (R): | Mice infected with the S strain (virulent) die from pneumonia infection but mice infected with the R strain do not develop pneumonia. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Search for Genetic Material |
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Regarding DNA replication:
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: | It is semi-conservative. |
| II: | It is semi-discontinuous. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Â DNA Replication |
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Subtopic: Â Transcription |
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The repressor of the lac operon is synthesised:
| 1. | all the time |
| 2. | only when lactose is present |
| 3. | only when lactose is absent |
| 4. | only when glucose is present in high amount |
Subtopic: Â Gene Regulation: Lac Operon |
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