Q. No.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 |
In eukaryotes, the sequences that appear in mature or processed mRNA are called:
| 1. | Introns | 2. | Cistrons |
| 3. | Exons | 4. | Mutons |
What radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?
| 1. | 35S | 2. | 15N |
| 3. | 32P | 4. | None |
Sickle cell anemia is caused by:
| 1. | Chromosomal aberration | 2. | Point mutation |
| 3. | Non-disjunction event | 4. | An arthropod vector |
Whose cell free system finally helped the genetic code to be deciphered?
| 1. | Gamow | 2. | Severo Ochoa |
| 3. | Hargobind Khorana | 4. | Marshall Nirenberg |
Which of the following would be nucleoside found only in RNA?
| 1. | Thymidine | 2. | Cytidine |
| 3. | Uridine | 4. | Adenosine |
Which of the following acts as the substrate and provides energy for DNA replication?
| 1. | Dideoxyribonucleoside triphospahtes |
| 2. | Ribonucleoside triphosphates |
| 3. | Deoxyribonucleoside triphospahtes |
| 4. | Deoxyribonucleotide triphosphates |
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