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Q. No.In an inducible operon, the genes are:
1. usually not expressed unless a signal turns them "on"
2. usually expressed unless a signal turns them "off"
3. never expressed
4. always expressed
Subtopic: Gene Regulation: Lac Operon |
69%
From NCERT
NEET - 2013
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Which of the following is not a property of the genetic code?
1. Non-overlapping
2. Ambiguous
3. Degeneracy
4. Universal
1. Non-overlapping
2. Ambiguous
3. Degeneracy
4. Universal
Subtopic: Genetic Code |
77%
From NCERT
NEET - 2013
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Subtopic: DNA Fingerprinting |
NEET - 2013
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Why is a capsule advantageous to a bacterium?
| 1. | It protects the bacterium from desiccation |
| 2. | It provides means of locomotion |
| 3. | It allows the bacterium to "hide" from the host's immune system. |
| 4. | It allows the bacterium to attach to the surface |
Subtopic: Search for Genetic Material:I |
From NCERT
NEET - 2013
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The figure gives an important concept in the genetic implication of DNA. Fill in the blanks A, B and C.
1. A - Maurice Wilkins B - transcription C - translation
2. A - James Watson B - replication C - extension
3. A - Erwin Chargaff B - translation C - replication
4. A - Francis Crick B - translation C - transcription
Subtopic: DNA Double Helix | DNA Replication |
91%
From NCERT
NEET - 2013
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Identify the correct statements:
| I: | DNA acts as the genetic material in most organisms. |
| II: | RNA though it also acts as a genetic material in some viruses, mostly functions as a messenger. |
| III: | RNA functions as an adapter, structural, and in some cases as a catalytic molecule. |
| 1. | I and II only |
| 2. | I and III only |
| 3. | II and III only |
| 4. | I, II and III only |
Subtopic: DNA vs RNA as Genetic Material | Translation |
From NCERT
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Regarding the conclusions that can be from the Griffith experiment:
I: R strain bacteria was somehow been transformed by the heat-killed S strain bacteria.
II: Some ‘transforming principle’, transferred from the heat-killed S strain, enabled the R strain to synthesise a smooth polysaccharide coat and become virulent.
III: The biochemical nature of genetic material was DNA.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
I: R strain bacteria was somehow been transformed by the heat-killed S strain bacteria.
II: Some ‘transforming principle’, transferred from the heat-killed S strain, enabled the R strain to synthesise a smooth polysaccharide coat and become virulent.
III: The biochemical nature of genetic material was DNA.
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Search for Genetic Material |
56%
From NCERT
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Assertion(A): Repetitive sequences have become very useful identification tools in forensic applications.
Reason(R): DNA from every tissue from an individual show the different degree of polymorphism.
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. (A) is false, but (R) is true.
Reason(R): DNA from every tissue from an individual show the different degree of polymorphism.
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. (A) is false, but (R) is true.
Subtopic: DNA Fingerprinting |
59%
From NCERT
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Assertion(A): 20 amino acids have to be coded by the combination of four bases.
Reason(R): Each nucleic acid has four types of bases.
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. (A) is false, but (R) is true.
Reason(R): Each nucleic acid has four types of bases.
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. (A) is false, but (R) is true.
Subtopic: Genetic Code |
From NCERT
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Assertion(A): Transcription and translation occur in the same compartment in bacteria.
Reason(R): Translation begins much before transcription ends in bacteria.
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. (A) is false, but (R) is true.
Reason(R): Translation begins much before transcription ends in bacteria.
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. (A) is false, but (R) is true.
Subtopic: Transcription |
60%
From NCERT
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