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Q. No.If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is: 5' - A T G A A T G - 3',
the sequence of bases in its RNA transcript would be;
1. 5' - A U G A A U G - 3'
2. 5' - U A C U U A C - 3'
3. 5' - C A U U C A U - 3'
4. 5' - G U A A G U A - 3'
Subtopic: Transcription |
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The RNA polymerase holoenzyme transcribes:
1. the promoter, structural gene and the terminator region
2. the promoter and the terminator region
3. the structural gene and the terminator region
4. the structural gene only.
1. the promoter, structural gene and the terminator region
2. the promoter and the terminator region
3. the structural gene and the terminator region
4. the structural gene only.
Subtopic: Transcription |
From NCERT
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If the base sequence of a codon in mRNA is 5'-AUG-3', the sequence of tRNA pairing with it must be:
1. 5' - UAC - 3'
2. 5' - CAU - 3'
3. 5' - AUG - 3'
4. 5' - GUA - 3'
1. 5' - UAC - 3'
2. 5' - CAU - 3'
3. 5' - AUG - 3'
4. 5' - GUA - 3'
Subtopic: Translation |
From NCERT
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The amino acid attaches to the tRNA at its:
1. 5' - end
2. 3' - end
3. Anti codon site
4. DHU loop
1. 5' - end
2. 3' - end
3. Anti codon site
4. DHU loop
Subtopic: Translation |
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To initiate translation, the mRNA first binds to:
1. The smaller ribosomal sub-unit,
2. The larger ribosomal sub-unit
3. The whole ribosome
4. No such specificity exists.
1. The smaller ribosomal sub-unit,
2. The larger ribosomal sub-unit
3. The whole ribosome
4. No such specificity exists.
Subtopic: Translation |
84%
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In E.coli, the lac operon gets switched on when:
1. lactose is present and it binds to the repressor
2. repressor binds to operator
3. RNA polymerase binds to the operator
4. lactose is present and it binds to RNA polymerase
1. lactose is present and it binds to the repressor
2. repressor binds to operator
3. RNA polymerase binds to the operator
4. lactose is present and it binds to RNA polymerase
Subtopic: Gene Regulation: Lac Operon |
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If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of \(N^{15} / N^{15}: N^{15} / N^{14}: N^{14} / N^{14}\) containing DNA in the fourth generation would be:
1. 1:1:0
2. 1:4:0
3. 0:1:3
4. 0:1:7
1. 1:1:0
2. 1:4:0
3. 0:1:3
4. 0:1:7
Subtopic: Search for Genetic Material |
71%
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In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:
1. A-DNA
2. B-DNA
3. cDNA
4. rDNA
1. A-DNA
2. B-DNA
3. cDNA
4. rDNA
Subtopic: The DNA |
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While analysing the DNA of an organism a total number of 5386 nucleotides were found out of which the proportion of different bases were: Adenine = 29%, Guanine = 17%, Cytosine = 32%, Thymine = 17%. Considering the Chargaff’s rule it can be concluded that:
1. it is a double stranded circular DNA
2. It is single stranded DNA
3. It is a double stranded linear DNA
4. No conclusion can be drawn
1. it is a double stranded circular DNA
2. It is single stranded DNA
3. It is a double stranded linear DNA
4. No conclusion can be drawn
Subtopic: DNA Double Helix |
55%
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Which of the following are the functions of RNA?
1. It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.
2. It carries amino acids to ribosomes.
3. It is a constituent component of ribosomes.
4. All of the above.
1. It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.
2. It carries amino acids to ribosomes.
3. It is a constituent component of ribosomes.
4. All of the above.
Subtopic: Translation |
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