Who suggested that the genetic code should be made of three nucleotides?
1. | Gamow | 2. | Severo Ochoa |
3. | Hargobind Khorana | 4. | Marshall Nirenberg |
In eukaryotes RNA polymerase II transcribes:
1. | mRNA | 2. | rRNA |
3. | tRNA | 4. | hnRNA |
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’ |
Some amino acids are coded by more than one codon. Hence genetic code is:
1. | Unambiguous | 2. | Non-specific |
3. | Degenerate | 4. | Universal |
Prior to the work of Avery, Macleod, and McCarty, the genetic material was thought to be:
1. | DNA | 2. | RNA |
3. | Protein | 4. | Nucleotide |
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 |
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 |
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 |
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 |
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 |