Read the following statements and choose the set of correct statements:
(a)
Euchromatin is loosely packed chromatin.
(b)
Heterochromatin is transcriptionally active.
(c)
Histone octomer is wrapped by negatively charged DNA in nucleosome.
(d)
Histones are rich in lysine and arginine.
(e)
A typical nucleosome contains 400 bp of DNA helix.
Choose the correct answer from the options given below:
1. (a), (c), (e) only
2. (b), (d), (e) only
3. (a), (c), (d) only
4. (b), (e) only
Subtopic: DNA Double Helix | DNA Packaging |
90%
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NEET - 2022
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The process of translation of mRNA to proteins begins as soon as:
| 1. | The tRNA is activated and the larger subunit of ribosome encounters mRNA |
| 2. | The smaller subunit of ribosome encounters mRNA |
| 3. | The larger subunit of ribosome encounters mRNA |
| 4. | Both the subunits join together to bind with mRNA |
Subtopic: Translation |
67%
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NEET - 2022
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DNA polymorphism forms the basis of
1. Translation
2. Genetic mapping
3. DNA finger printing
4. Both genetic mapping and DNA fingerprinting
Subtopic: DNA Fingerprinting |
72%
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If a geneticist uses the blind approach for sequencing the whole genome of an organism, followed by assignment of function to different segments, the methodology adopted by him is called as:
1. Bioinformatics
2. Sequence annotation
3. Gene mapping
4. Expressed sequence tags
Subtopic: Human Genome Project |
67%
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NEET - 2022
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In an E.coli strain i gene gets mutated and its product cannot bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome ?
1. RNA polymerase will bind the promoter region
2. Only z gene will get transcribed
3. z, y, a genes will be transcribed
4. z, y, a genes will not be translated
1. RNA polymerase will bind the promoter region
2. Only z gene will get transcribed
3. z, y, a genes will be transcribed
4. z, y, a genes will not be translated
Subtopic: Gene Regulation: Lac Operon |
From NCERT
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If the length of a DNA molecules is 1.1 metres, what will be the approximate number of base pairs?
1.\(6.6 \times 10^{6} \mathrm{bp}\)
2. \(3.3 \times 10^{9} \mathrm{bp}\)
3. \(6.6 \times 10^{9} \mathrm{bp}\)
4. \(3.3 \times 10^{6} \mathrm{bp}\)
1.\(6.6 \times 10^{6} \mathrm{bp}\)
2. \(3.3 \times 10^{9} \mathrm{bp}\)
3. \(6.6 \times 10^{9} \mathrm{bp}\)
4. \(3.3 \times 10^{6} \mathrm{bp}\)
Subtopic: The DNA |
77%
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Ten E.coli cells with \({ }^{15} \mathrm{~N}\) - ds DNA are incubated in medium containing \({ }^{14} \mathrm{~N}\) nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from \({ }^{15} \mathrm{~N}\) ?
1. 80 cells
2. 20 cells
3. 40 cells
4. 60 cells
1. 80 cells
2. 20 cells
3. 40 cells
4. 60 cells
Subtopic: Search for Genetic Material |
57%
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Which one of the following is not a criterion of genetic material?
| 1. | Should not provide the scope for changes for evolution |
| 2. | Should be able to express itself in the form of Mendelian character |
| 3. | Should be able to generate its replica |
| 4. | Should be stable chemically and structurally |
Subtopic: DNA vs RNA as Genetic Material |
91%
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DNA replication is semi-conservative in nature. This was experimentally proved in eukaryotes by:
1. Hershey and Chase
2. Macleod and McCarty
3. Meselson and Stahl
4. Talyor and his colleagues
Subtopic: DNA Replication |
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Which one of the following experiments of Frederick Griffith resulted in the discovery of bacterial transformation?
| 1. | S-stain(heat-killed) → injected in to Mice → Mice lived |
| 2. | S-strain (heat killed) + R-strain(live) → injected in to Mice → Mice died |
| 3. | S-stain → injected in to Mice → Mice died |
| 4. | R-strain → injected in to Mice → Mice lived |
Subtopic: Search for Genetic Material |
91%
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NEET - 2022
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