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 |
90%
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 |
90%
From NCERT
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All the following regarding the salient features of the Double-helix structure of DNA are true 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 - if one chain has the polarity 5' → 3', the other has 3'→5'. |
| 3. | The two chains are coiled in a right-handed fashion. |
| 4. | The pitch of the helix is 34 nm and there are roughly 10 bp in each turn. |
Subtopic: DNA Double Helix |
77%
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 |
54%
From NCERT
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Identify the incorrect statement regarding DNA replication:
| 1. | The main DNA replication enzyme is referred to as DNA-dependent DNA polymerase since it uses a DNA template to catalyse the polymerisation of deoxynucleotides. |
| 2. | Deoxyribonucleoside triphosphates act as substrates and provide energy for polymerisation reactions. |
| 3. | Since the two strands of DNA cannot be separated in their entire length, the replication occur within a small opening of the DNA helix, referred to as the replication fork. |
| 4. | The DNA-dependent DNA polymerases catalyse polymerisation only in one direction, that is 3'→5'. |
Subtopic: DNA Replication |
85%
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 |
58%
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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Assertion(A): The strand that has the polarity 3'→5' acts as a template.
Reason(R): DNA-dependent RNA polymerase catalyses the polymerisation in only one direction, that is, 3'→5'
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-dependent RNA polymerase catalyses the polymerisation in only one direction, that is, 3'→5'
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 Double Helix |
76%
From NCERT
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