Q. No.What radioactive isotope was used in Meselson and Stahl experiment to prove the semi-conservative mode of DNA replication?
1.
35S
2.
32P
3.
15N
4.
None
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Under conditions where methionine must be the first amino acid, what protein would be coded for by the following mRNA?
5'-CCUCAUAUGCGCCAUUAUAAGUGACACACA-3'
| 1. | pro his met arg his tyrlyscys his thr |
| 2. | met arg his tyrlyscys his thr |
| 3. | met arg his tyrlys |
| 4. | met pro his met arg his tyrlyscys his thr |
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Which of the following is likely if there is a mutation in the lacY gene of the lac operon in E.coli?
| 1. | The lac genes would be expressed efficiently only in the absence of lactose. |
| 2. | The lac genes would be expressed efficiently until the lactose supply in the cell is exhausted. |
| 3. | The lac genes would be expressed continuously. |
| 4. | Expression of the lac genes would cease immediately. |
The difference between ATP and the nucleoside triphosphates used during DNA synthesis is that:
| 1. | The nucleoside triphosphates have the sugar deoxyribose; ATP has the sugar ribose. |
| 2. | The nucleoside triphosphates have two phosphate groups; ATP has three phosphate groups. |
| 3. | ATP contains three high-energy bonds; the nucleoside triphosphates have two. |
| 4. | ATP is found only in human cells; the nucleoside triphosphates are found in all animal and plant cells. |
Which of the following pairs of codons encode the same amino acid?
| 1. | AUG and AUC | 2. | UAA and UAC |
| 3. | GUA and GUG | 4. | UAG and UAC |
The salient features of the human genome include all except:
1. About 1.4 million SNP locations
2. Functions known for less than 50% of the discovered genes
3. The actual number of genes and the initial estimates are remarkable similar
4. More than 98% of genome does not code for proteins
In some viruses, DNA is synthesised by using RNA as a template. Such a DNA is called:
| 1. | A-DNA | 2. | B-DNA |
| 3. | cDNA | 4. | rDNA |
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If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of N15/N15: N15/N14: N14/N14 containing DNA in the fourth generation would be:
| 1. | 1:1:0 | 2. | 1:4:0 |
| 3. | 0:1:3 | 4. | 0:1:7 |
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If the sequence of nitrogen bases of the coding strand of DNA in a transcription unit is:
5' -ATGAATG-3',
the sequence of bases in its RNA transcript would be;
1. 5'-AUGAAUG-3'
2. 5'-UACUUAC-3'
3. 5'-CAUUCAU-3'
4. 5'-GUAAGUA-3'
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.
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