The ‘beads-on-string’ is the description used for the structure of:
1.
nucleolus in a nucleus
2.
heterochromatic inactivated X chromosome in females
3.
nucleosome in chromatin
4.
tetrad of paired homologs in first meiosis
Subtopic: DNA Packaging |
94%
From NCERT
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Consider the two statements:
| Statement I: | The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called a nucleosome. |
| Statement II: | A typical nucleosome contains 200 bp of DNA helix. |
| 1. | Statement I is incorrect; Statement II is correct |
| 2. | Statement I is correct; Statement II is correct |
| 3. | Statement I is correct; Statement II is incorrect |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: DNA Packaging |
92%
From NCERT
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Consider the given statements:
| Assertion (A): | On one strand the replication of DNA is continuous, while on the other, it is discontinuous. |
| Reason (R): | The discontinuously synthesised fragments are later joined by the enzyme DNA ligase. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False. |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: DNA Replication |
83%
From NCERT
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The mRNA codons for glutamic acid and valine can respectively be:
1. UAG and UGA
2. UUU and GGG
3. GAG and GUG
4. AUG and UAC
1. UAG and UGA
2. UUU and GGG
3. GAG and GUG
4. AUG and UAC
Subtopic: Search for Genetic Material:I | Search for Genetic Material: II | DNA Replication: I | DNA Replication: II | DNA Replication:III | Solved Problems | Transcription: I | Transcription:II | Transcription: III | Transcription: IV |
87%
From NCERT
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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: DNA Double Helix |
91%
From NCERT
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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
1. DNA
2. RNA
3. Proteins
4. Lipids
Subtopic: DNA Fingerprinting |
79%
From NCERT
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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: Transcription |
85%
From NCERT
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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: DNA Fingerprinting |
78%
From NCERT
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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: DNA Packaging |
75%
From NCERT
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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: Transcription |
66%
From NCERT
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