Q. No.What defines a coding and a template strand in the transcription unit?
1.
Structural gene
2.
Ori
3.
Terminator
4.
Promoter
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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 |
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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 |
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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 |
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A transcription unit does not contain:
| 1. | Promoter | 2. | Operator |
| 3. | Structural gene | 4. | Terminator |
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DNA was first identified by:
| 1. | Friedrich Meischer | 2. | Phoebus Levene |
| 3. | Linus Pauling | 4. | Erwin Chargaff |
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The discontinuously synthesized DNA fragments are later joined by:
| 1. | DNA helicase | 2. | Topoisomerase |
| 3. | DNA ligase | 4. | DNA polymerase |
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Which of the following RNAs plays both structural and catalytic roles?
| 1. | mRNA | 2. | tRNA |
| 3. | rRNA | 4. | miRNA |
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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 |
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In eukaryotes, the sequences that appear in mature or processed mRNA are called:
| 1. | Introns | 2. | Cistrons |
| 3. | Exons | 4. | Mutons |
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