Q. No.Histones are:
1.
Positively charged and basic amino acids
2.
Negatively charged and basic proteins
3.
Positively charged and acidic proteins
4.
Not found in bacteria
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Reverse transcriptase is a:
| 1. | DNA-dependent RNA polymerase |
| 2. | RNA-dependent DNA polymerase |
| 3. | RNA-dependent RNA polymerase |
| 4. | DNA-dependent DNA polymerase |
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The density gradient in Meselson and Stahl's experiment was of:
| 1. | NH4Cl | 2. | CsCl |
| 3. | KCl | 4. | BaCl2 |
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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 |
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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’ |
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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 |
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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 |
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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 |
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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 |
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