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Q. No.Select the correct statement(s) about lac operon
a. Glucose or galactose act as inducer for the expression of lac operon
b. In the presence of lactose the repressor protein binds with the lactose molecules
c. It is an example of repressible operon system
d. Its regulation by repressor protein is called positive regulation.
1. a and b
2. b and c
3. Only b
4. Only d
Subtopic: Gene Regulation: Lac Operon |
From NCERT
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The genes in eukaryotes are said to be split as
1. They have introns only
2. They have interrupted coding sequences
3. Mature mRNA contains both exons and introns
4. They have exons only
1. They have introns only
2. They have interrupted coding sequences
3. Mature mRNA contains both exons and introns
4. They have exons only
Subtopic: Transcription |
69%
From NCERT
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Select the true statement(s) for AUG.
A. It codes for an amino acid methionine
B. It is an initiation codon
C. It is a non-degenerate codon
1. Only A
2. Only A and B
3. Only B and C
4. All A, B and C
A. It codes for an amino acid methionine
B. It is an initiation codon
C. It is a non-degenerate codon
1. Only A
2. Only A and B
3. Only B and C
4. All A, B and C
Subtopic: Genetic Code |
67%
From NCERT
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Mark the wrong statement.
1. In prokaryotes, transcription and translation occur in the different compartments
2. In eukaryotes, usually structural gene of transcription unit is monocistronic
3. In prokaryotes, the mRNA is produced in the cytoplasm
4. In eukaryotes, the primary transcript undergoes splicing
1. In prokaryotes, transcription and translation occur in the different compartments
2. In eukaryotes, usually structural gene of transcription unit is monocistronic
3. In prokaryotes, the mRNA is produced in the cytoplasm
4. In eukaryotes, the primary transcript undergoes splicing
Subtopic: Transcription |
79%
From NCERT
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In prokaryotic translation, the formation of peptide bond between two amino acids is catalysed by a
1. Proteinaceous enzyme
2. Lysozyme
3. RNA catalyst
4. Ribonuclease
1. Proteinaceous enzyme
2. Lysozyme
3. RNA catalyst
4. Ribonuclease
Subtopic: Translation |
68%
From NCERT
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The experimental proof for semiconservative mode of DNA replication was first shown in a bacterium, by
1. Meselson and Stahl
2. Hershey and Chase
3. Jacob and Monod
4. Alec Jeffreys
1. Meselson and Stahl
2. Hershey and Chase
3. Jacob and Monod
4. Alec Jeffreys
Subtopic: DNA Replication |
81%
From NCERT
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Heterochromatin is
(a) Darkly stained
(b) Loosely packed chromatin
(c) Transcriptionally inactive
1. Only (a)
2. Only (a) and (b)
3. Only (b) and (c)
4. Only (a) and (c)
(a) Darkly stained
(b) Loosely packed chromatin
(c) Transcriptionally inactive
1. Only (a)
2. Only (a) and (b)
3. Only (b) and (c)
4. Only (a) and (c)
Subtopic: DNA Packaging |
87%
From NCERT
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Select true (T) or false (F) for the following statements and choose the correct option.
A. QB bacteriophage has RNA as genetic material.
B. Free 2'OH of RNA makes it more labile and easily degradable.
C. The experiment of Hershey and Chase gave unequivocal proof that DNA is the genetic material.
A. QB bacteriophage has RNA as genetic material.
B. Free 2'OH of RNA makes it more labile and easily degradable.
C. The experiment of Hershey and Chase gave unequivocal proof that DNA is the genetic material.
| A | B | C | |
| 1. | T | F | T |
| 2. | F | F | T |
| 3. | T | T | T |
| 4. | T | F | F |
Subtopic: The DNA | DNA vs RNA as Genetic Material | Search for Genetic Material |
76%
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Polymorphism in DNA sequence is the basis of which of the following?
(a) Genetic mapping of human genome
(b) DNA fingerprinting
(c) Similarities among human beings
1. Only (a)
2. Only (b)
3. Only (a) and (b)
4. Only (b) and (c)
(a) Genetic mapping of human genome
(b) DNA fingerprinting
(c) Similarities among human beings
1. Only (a)
2. Only (b)
3. Only (a) and (b)
4. Only (b) and (c)
Subtopic: Human Genome Project | DNA Fingerprinting |
85%
From NCERT
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Satellite DNA
1. Codes for proteins which are needed in the chloroplast
2. Codes enzymes for Krebs' cycle
3. Does not code for proteins
4. Form a little portion of human genome
1. Codes for proteins which are needed in the chloroplast
2. Codes enzymes for Krebs' cycle
3. Does not code for proteins
4. Form a little portion of human genome
Subtopic: DNA Fingerprinting |
75%
From NCERT
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