In Griffith's experiment, which of the following bacterial strains was capable of causing pneumonia in mice?
1. | Live R |
2. | Bacteria strain with polysaccharide coat |
3. | Heat Killed S |
4. | Live R with capsule and Heat Killed S |
What facilitates the opening of the helix during the elongation step of transcription?
1. | RNA polymerase | 2. | Helicase |
3. | Topoisomerase | 4. | Gyrase |
The repressor of the lac operon is:
1. | Lactose itself | 2. | A steroid |
3. | Synthesized constitutively | 4. | A product of structural gene |
The base pairing in a double stranded DNA is correctly described as:
1. | Similar | 2. | Identical |
3. | Complementary | 4. | Synergistic |
In a transcription unit, RNA polymerase binds to:
1. | Ori | 2. | Promoter |
3. | Operator | 4. | Structural gene |
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 |
Transcription and translation can be coupled in:
1. | Bacteria | 2. | Yeast |
3. | Plants | 4. | Animals |
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 |
In a transcription unit, with respect to structural genes, the promoter is located:
1. | Upstream and 5’ | 2. | Upstream and 3’ |
3. | Downstream and 5’ | 3. | Downstream and 3’ |
Which of the following codons has a dual role in the genetic code?
1. | AUG | 2. | GUG |
3. | CUG | 4. | UUG |