Q. No.What is another name for thymine?
1. 5 – bromouracil 2. 3 – bromouracil 3. 3 – methyl uracil 4. 5 – methyl uracil
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Griffith’s transformation experiment in Streptococcus pneumoniae demonstrated that:
1. Heat-killed virulent bacteria failed to produce disease in mice
2. Live non-virulent bacteria failed to produce disease in mice
3. Heat-killed virulent bacteria transformed non-virulent bacteria into virulent form
4. Live virulent bacteria alone produced fatal infection in mice
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What facilitates the opening of the helix during the elongation step of transcription?
| 1. | RNA polymerase | 2. | Helicase |
| 3. | Topoisomerase | 4. | Gyrase |
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The repressor of the lac operon is:
| 1. | Lactose itself | 2. | A steroid |
| 3. | Synthesized constitutively | 4. | A product of structural gene |
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The base pairing in a double stranded DNA is correctly described as:
| 1. | Similar | 2. | Identical |
| 3. | Complementary | 4. | Synergistic |
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Any mistakes during DNA replication by the enzyme would result into:
| 1. | Cancer | 2. | Apoptosis |
| 3. | Cell fragmentation | 4. | Mutation |
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In a transcription unit, RNA polymerase binds to:
| 1. | Ori | 2. | Promoter |
| 3. | Operator | 4. | Structural gene |
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The distance between a base pair in the DNA double helix is approximately:
| 1. | 2.0 nm | 2. | 0.34 nm |
| 3. | 20 nm | 4. | 3.4 nm |
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In some viruses, the flow of genetic information is from RNA to DNA. These viruses are:
| 1. | Reverse transcriptases | 2. | Reoviruses |
| 3. | Ribozymes | 4. | Retroviruses |
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