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Q. No.Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?
1. One of the daughter cells, but not the other, would have radioactive DNA.
2. Neither of the two daughter cells would be radioactive.
3. All four bases of the DNA would be radioactive.
4. DNA in both daughter cells would be radioactive.
Subtopic: DNA Replication |
53%
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Which of the following provides some evidence that RNA probably evolved before DNA?
1. RNA polymerase uses DNA as a template.
2. RNA polymerase makes a single-stranded molecule.
3. RNA polymerase does not require localized unwinding of the DNA.
4. DNA polymerase uses primer, usually made of RNA
1. RNA polymerase uses DNA as a template.
2. RNA polymerase makes a single-stranded molecule.
3. RNA polymerase does not require localized unwinding of the DNA.
4. DNA polymerase uses primer, usually made of RNA
Subtopic: DNA vs RNA as Genetic Material |
59%
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A section of double stranded DNA is composed of 41% adenine bases. What is the percentage of cytosine bases in this section of DNA?
1. 18%
2. 9%
3. 36%
4. 82%
1. 18%
2. 9%
3. 36%
4. 82%
Subtopic: DNA Double Helix |
90%
From NCERT
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Genes involved in turning on (or) off the transcription of a set of structural genes are called
1. Operator genes
2. Polymorphic genes
3. Redundant genes
4. Regulatory genes
1. Operator genes
2. Polymorphic genes
3. Redundant genes
4. Regulatory genes
Subtopic: Gene Regulation: Lac Operon |
66%
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What would happen, if in a gene encoding a polypeptide of 50 amino acids, 25th codon UAU is mutated to UAA?
1. Two polypeptides of 24 and 25 amino acids will be formed
2. A polypeptide of 25 amino acids will be formed
3. A polypeptide of 49 amino acids will be formed
4. A polypeptide of 24 amino acids will be formed
1. Two polypeptides of 24 and 25 amino acids will be formed
2. A polypeptide of 25 amino acids will be formed
3. A polypeptide of 49 amino acids will be formed
4. A polypeptide of 24 amino acids will be formed
Subtopic: Translation |
80%
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Which of the following is the sequence of mRNA transcribed from the below DNA?
3' - ATCCCAGGTACCAT - 5'
1. 3' - UAGGGUCCAUGGUA - 5'
2. 5' - UAGGGUCCAUGGUA - 3'
4. 3' -TAGGGTCCATGGTA -5'
4. 5' - TAGGGTCCATGGTA - 3'
3' - ATCCCAGGTACCAT - 5'
1. 3' - UAGGGUCCAUGGUA - 5'
2. 5' - UAGGGUCCAUGGUA - 3'
4. 3' -TAGGGTCCATGGTA -5'
4. 5' - TAGGGTCCATGGTA - 3'
Subtopic: Transcription |
78%
From NCERT
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Process of transcription in bacteria involves
1. Polyadenylation, initiation, termination
2. Capping, elongation, termination
3. Elongation, splicing, termination
4. Initiation, elongation, termination
1. Polyadenylation, initiation, termination
2. Capping, elongation, termination
3. Elongation, splicing, termination
4. Initiation, elongation, termination
Subtopic: Transcription |
88%
From NCERT
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During replication in E.coli, mutations inactivate the gene coding for beta-galactosidase. Which of the following will be affected?
1. Hydrolysis of glucose
2. Hydrolysis of lactose
3. Hydrolysis of galactose
4. Hydrolysis of xylulose
1. Hydrolysis of glucose
2. Hydrolysis of lactose
3. Hydrolysis of galactose
4. Hydrolysis of xylulose
Subtopic: Gene Regulation: Lac Operon |
82%
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In the genome, genes regulated by common regulator are placed together in an arrangement known as
1. DNA
2. Operon
3. Spacer
4. Repeat
1. DNA
2. Operon
3. Spacer
4. Repeat
Subtopic: Gene Regulation: Lac Operon |
77%
From NCERT
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Match List I with List II
Choose the correct answer from the following given below:
1. A-III B-IV C-I D-II
2. A-I B-II C-III D-IV
3. A-II B-III C-IV D-I
4. A-IV B-III C-I D-II
| List I | List II |
| A. Frederick Griffith | I. DNA replicate semi-conservatively |
| B. Alfred Hershey & Martha chase | II. Cell-free system for protein synthesis |
| C. Matthew Meselson & Frank Stahl | III. Transforming principle |
| D. Marshall Nirenberg | IV. DNA-Genetic material |
1. A-III B-IV C-I D-II
2. A-I B-II C-III D-IV
3. A-II B-III C-IV D-I
4. A-IV B-III C-I D-II
Subtopic: DNA Replication | Search for Genetic Material |
87%
From NCERT
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