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Q. No.Reverse transcriptase is a:
1.
DNA-dependent RNA polymerase
2.
RNA-dependent DNA polymerase
3.
RNA-dependent RNA polymerase
4.
DNA-dependent DNA polymerase
Subtopic: DNA Replication |
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The density gradient in Meselson and Stahl's experiment was of:
| 1. | NH4Cl | 2. | CsCl |
| 3. | KCl | 4. | BaCl2 |
Subtopic: DNA Replication |
84%
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Who suggested that the genetic code should be made of three nucleotides?
| 1. | Gamow | 2. | Severo Ochoa |
| 3. | Hargobind Khorana | 4. | Marshall Nirenberg |
Subtopic: Genetic Code: I | Genetic Code: II | Genetic Code: III |
72%
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Subtopic: Transcription: I |
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Which of the following anticodons will hybridize with the mRNA codon 5’ – AUG – 3’?
| 1. | 5’ – UAC – 3’ | 2. | 5’ – TAC – 3’ |
| 3. | 3’ – UAC – 5’ | 4. | 3’ – TAC – 5’ |
Subtopic: Translation |
72%
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Some amino acids are coded by more than one codon. Hence genetic code is:
| 1. | Unambiguous | 2. | Non-specific |
| 3. | Degenerate | 4. | Universal |
Subtopic: Genetic Code |
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Prior to the work of Avery, Macleod, and McCarty, the genetic material was thought to be:
| 1. | DNA | 2. | RNA |
| 3. | Protein | 4. | Nucleotide |
Subtopic: Search for Genetic Material |
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The length of DNA in a typical mammalian cell is approximately:
| 1. | 1.1 meter | 2. | 1.5 meter |
| 3. | 2.2 meter | 4. | 3.3 meter |
Subtopic: DNA Packaging |
91%
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A very low level of expression of the lac operon has to be present in the cell:
| 1. | When lactose is present | 2. | When lactose is absent |
| 3. | When glucose is absent | 4. | All the time |
Subtopic: Gene Regulation: Lac Operon |
62%
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The UTR [untranslated regions] in an mRNA:
| 1. | Are present only at 5’ end and are not required for efficient translation |
| 2. | Are present only at 3’ end and are not required for efficient translation |
| 3. | Are present at both 5’ and 3’ends and are not required for efficient translation |
| 4. | Are present at both 5’ and 3’ ends and are required for an efficient translation process |
Subtopic: Translation Mechanism |
78%
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