Q. No.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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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 |
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Which of the following is not a feature of the double helix model of DNA?
| 1. | The two chains have anti-parallel polarity |
| 2. | A purine always comes opposite to a pyrimidine |
| 3. | The pitch of the DNA is 3.4 nm |
| 4. | The two chains are coiled in a left handed fashion |
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Gene regulation in prokaryotes is carried out exclusively at the level of:
| 1. | Initiation of transcription |
| 2. | Post-transcriptional modifications |
| 3. | Translation |
| 4. | Post-translational modifications |
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