Insertion or deletion of how many bases will not cause a frameshift mutation?
1. | 1 | 2. | 2 |
3. | 3 | 4. | Any number |
What defines a coding and a template strand in the transcription unit?
1. | Structural gene | 2. | Ori |
3. | Terminator | 4. | Promoter |
The DNA dependent polymerases catalyze:
1. | Only in 3’ – 5’ direction |
2. | Only in 5’ – 3’ direction |
3. | In both directions |
4. | In neither directions |
DNA is structurally and chemically more stable than RNA because of the following except:
1. | It has thymine instead of uracil |
2. | 2’ –OH is absent in DNA |
3. | It replicates itself based on complementary base pairing |
4. | It does not have any catalytic role |
Who proposed a semi-conservative mode of replication for DNA?
1. | Watson and Crick | 2. | Meselson and Stahl |
3. | Hershey and Chase | 4. | Beadle and Tatum |
A transcription unit does not contain:
1. | Promoter | 2. | Operator |
3. | Structural gene | 4. | Terminator |
DNA was first identified by:
1. | Friedrich Meischer | 2. | Phoebus Levene |
3. | Linus Pauling | 4. | Erwin Chargaff |
The discontinuously synthesized DNA fragments are later joined by:
1. | DNA helicase | 2. | Topoisomerase |
3. | DNA ligase | 4. | DNA polymerase |
Which of the following RNAs plays both structural and catalytic roles?
1. | mRNA | 2. | tRNA |
3. | rRNA | 4. | miRNA |
If E.coli was allowed to grow for 80 minutes after transfer from 15N to 14N medium, the number of hybrid density DNA molecules would be:
1. | 2 | 2. | 16 |
3. | 14 | 4. | 8 |