Q. No.Heterochromatin differs from euchromatin in being:
| 1. | Densely packed and transcriptionally inactive |
| 2. | Lightly packed and rich in ribosomes |
| 3. | Site of active gene transcription |
| 4. | Composed entirely of RNA |
Subtopic: DNA Packaging |
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Identify the incorrect statement:
| 1. | Histones are a set of positively charged, basic proteins. |
| 2. | Histones are rich in the basic amino acid residues lysine and arginine. |
| 3. | Histones are organised to form a unit of eight molecules called histone octamer. |
| 4. | The positively charged DNA is wrapped around the positively charged histone octamer to form a structure called centrosome. |
Subtopic: DNA Packaging |
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An octamer of 4 histones complexed with DNA forms
| 1. | Endosome | 2. | Nucleosome |
| 3. | Mesosome | 4. | Centromere |
Subtopic: DNA Packaging |
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Which of the following correctly differentiates euchromatin from heterochromatin?
| 1. | Euchromatin is transcriptionally active and loosely packed, while heterochromatin is tightly packed and transcriptionally inactive. |
| 2. | Euchromatin is found only in prokaryotes, whereas heterochromatin is present in eukaryotes. |
| 3. | Heterochromatin undergoes frequent transcription, while euchromatin remains permanently silent. |
| 4. | Heterochromatin contains all coding genes, while euchromatin consists of repetitive DNA sequences. |
Subtopic: DNA Packaging |
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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 |
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Choose correct one :-
| 1. | a-DNA, b-H-histone, c-histone octamer, d-core of histone |
| 2. | a-core of histone, b-DNA, c-H histone, d-histone octamer |
| 3. | a-Histone octamer, b-core of histone, c-DNA, d-H histone |
| 4. | a-H histone, b-histone octamer, c-core of histone, d-DNA |
Subtopic: DNA Packaging |
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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 |
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Histones are rich in:
| 1. | Basic amino acids lysine and arginine |
| 2. | Acidic amino acids lysine and arginine |
| 3. | Basic amino acids glutamate and aspartate |
| 4. | Acidic amino acids glutamate and aspartate |
Subtopic: DNA Packaging |
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A typical nucleosome contains:
| 1. | 40 bp of DNA helix | 2. | 60 bp of DNA helix |
| 3. | 140 bp of DNA helix | 4. | 200 bp of DNA helix |
Subtopic: DNA Packaging |
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The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
| 1. | Deletion of non-essential genes |
| 2. | Super-coiling in nucleosomes |
| 3. | DNAse digestion |
| 4. | Through elimination of repetitive DNA |
Subtopic: DNA Packaging |
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