Q. No.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
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 |
The lac operon is regarded as:
| 1. | Negative, Inducible | 2. | Negative, Repressible |
| 3. | Positive, Inducible | 4. | Positive, Repressible |
In RNA splicing:
| 1. | Exons are removed and introns are joined together |
| 2. | Introns are removed and exons are joined together |
| 3. | Cistrons are removed and introns are joined together |
| 4. | Introns are removed and Cistrons are joined together |
In most prokaryotes, the transcription unit is:
| 1. | Mono-cistronic | 2. | Poly-cistronic |
| 3. | Multi-cistronic | 4. | Uni-cistronic |
The last of 24 human chromosomes to be sequenced was:
1. Chromosome 1 and completed in 2003
2. Chromosome 1 and completed in 2006
3. Chromosome X and completed in 2003
4. Chromosome X and completed in 2006
Which of the following is not a feature of the human genome?
| 1. | The human genome contains 3164.7 million nucleotide bases. |
| 2. | The largest human gene of dystrophin has about 2.4 million bases. |
| 3. | The total number of genes in the human genome is much higher than the previous estimates. |
| 4. | Less than 2 % of the genome codes for proteins. |
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