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Q. No.DNA in prokaryotes is organised in large loops held by:
| 1. | Lipids | 2. | Lectins |
| 3. | Proteins | 4. | RNA strands |
Subtopic: DNA Packaging |
89%
From NCERT
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The Central dogma in molecular biology:
| I: | was proposed by James Watson and Francis Crick with inputs from Maurice Wilkins and Rosalind Franklin. |
| II: | states that the genetic information flows from DNA → RNA → Protein. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: DNA Double Helix |
65%
From NCERT
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In the given diagram:
1. Only I and II are correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II, and III are incorrect
| I: | A is 3’-5’ direction. |
| II: | B is hydrogen bond. |
| III: | C is phosphodiester bond. |
1. Only I and II are correct
2. Only II and III are correct
3. I, II and III are correct
4. I, II, and III are incorrect
Subtopic: DNA Double Helix |
66%
From NCERT
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During DNA replication the leading and lagging strands are synthesized differently. The reason for this difference is:
| 1. | DNA polymerase can work only on one strand at a time |
| 2. | The single-strand binding proteins cannot bind to both strands of DNA |
| 3. | DNA ligase works only in the 3ʹ →5ʹ direction |
| 4. | DNA polymerase can add new nucleotides only to the 3’ end of a growing strand |
Subtopic: DNA Replication |
61%
From NCERT
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Consider the given two statements:
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
| Statement I: | rRNA has a structural role in living organisms. |
| Statement II: | rRNA acts as the adapter molecule during the flow of genetic information in a cell. |
1. Statement I is correct; Statement II is correct
2. Statement I is incorrect; Statement II is correct
3. Statement I is correct; Statement II is incorrect
4. Statement I is incorrect; Statement II is incorrect
Subtopic: Transcription |
58%
From NCERT
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In a dsDNA molecule, the percentage composition of Adenine was found to be 19%. What is the expected percentage of Uracil in this molecule?
| 1. | 0 | 2. | 19 |
| 3. | 31 | 4. | 38 |
Subtopic: DNA Double Helix |
70%
From NCERT
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The length of DNA is:
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: | usually defined as number of nucleotides (or a pair of nucleotide referred to as base pairs) present in it. |
| II: | is the characteristic of an organism. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: The DNA |
80%
From NCERT
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The last of the 24 human chromosomes – 22 autosomes and X and Y – to be sequenced was:
1. Chromosome 1
2. the X chromosome
3. the Y chromosome
4. Chromosome 22
1. Chromosome 1
2. the X chromosome
3. the Y chromosome
4. Chromosome 22
Subtopic: Human Genome Project |
87%
From NCERT
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The "Southern" technique involves:
| 1. | the detection of DNA fragments on membranes by specific radioactive antibodies. |
| 2. | the detection of proteins on membranes using a radioactive DNA probe. |
| 3. | the detection of DNA fragments on membranes by a radioactive DNA probe. |
| 4. | the detection of proteins on membranes using specific radioactive antibodies. |
Subtopic: DNA Fingerprinting |
82%
From NCERT
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Regarding the working of lac operon in E.coli, which of the following is synthesized constitutively?
1. Repressor
2. Beta galactosidase
3. Transacetylase
4. Permease
1. Repressor
2. Beta galactosidase
3. Transacetylase
4. Permease
Subtopic: Gene Regulation: Lac Operon |
73%
From NCERT
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