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Q. No.Assertion: A very low level of expression of lac operon is present in E.coli all the time.
Reason: The structural genes of lac operon are transcribed constitutively.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Subtopic: Gene Regulation: Lac Operon |
From NCERT
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Assertion: Regulation of lac operon by repressor is referred to as negative regulation.
Reason: Regulation of lac operon is visualised as regulation of enzyme synthesis by its substrate.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Reason: Regulation of lac operon is visualised as regulation of enzyme synthesis by its substrate.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.
Subtopic: Gene Regulation: Lac Operon |
60%
From NCERT
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In the lac operon, transcription is regulated by a repressor protein and only takes place in the presence of lactose. Which of the following statements is correct?
1. The repressor protein binds to the promoter site to inhibit transcription.
2. Lactose binds to the promoter site to initiate transcription.
3. Lactose binds to the repressor protein to inhibit transcription.
4. The repressor protein binds the operator site to inhibit transcription.
1. The repressor protein binds to the promoter site to inhibit transcription.
2. Lactose binds to the promoter site to initiate transcription.
3. Lactose binds to the repressor protein to inhibit transcription.
4. The repressor protein binds the operator site to inhibit transcription.
Subtopic: Gene Regulation: Lac Operon |
65%
From NCERT
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One of the most frequently used techniques in DNA fingerprinting is:
1. VNTR
2. SSCP
3. SCAR
4. AFLP
1. VNTR
2. SSCP
3. SCAR
4. AFLP
Subtopic: DNA Fingerprinting |
94%
From NCERT
NEET - 2013
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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
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%
From NCERT
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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