In a strand of nucleic acid, two nucleotides are linked together by:
1. 3’ – 5’ phosphodiester bond
2. 5’ – 3’ phosphodiester bond
3. 2’ – 5’ phosphodiester bond
4. 3’ – 1’ phosphodiester bond
The daughter DNA that was extracted from the culture one generation after the transfer from 15N to 14N medium had:
1. | Low density |
2. | Intermediate density |
3. | High density |
4. | One had low and another had high density |
A failure in cell division after DNA replication results in:
1. | Point mutation | 2. | Aneuploidy |
3. | Polyploidy | 4. | Apoptosis |
What is another name for thymine?
1. | 5 – bromouracil | 2. | 3 – bromouracil |
3. | 3 – methyl uracil | 4. | 5 – methyl uracil |
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 |
Any mistakes during DNA replication by the enzyme would result into:
1. | Cancer | 2. | Apoptosis |
3. | Cell fragmentation | 4. | Mutation |
In a transcription unit, RNA polymerase binds to:
1. | Ori | 2. | Promoter |
3. | Operator | 4. | Structural gene |