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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 |
68%
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NEET - 2013
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Genes of interest can be selected from a genomic library by using:
1. Cloning vectors
2. DNA probes
3. Gene targets
4. Restriction enzymes
1. Cloning vectors
2. DNA probes
3. Gene targets
4. Restriction enzymes
Subtopic: DNA Fingerprinting |
53%
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 |
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%
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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 |
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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%
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