Gene regulation governing lactose operon of E. coli that involves the lac I gene products is:
| 1. | positive and inducible because it can be induced by lactose. |
| 2. | negative and inducible because repress or protein prevents transcription. |
| 3. | negative and repressible because repress or protein prevents transcription. |
| 4. | feedback inhibition because excess of β galactosidase can switch off transcription. |
Which one of the following is wrongly matched?
| 1. | Transcription- Writing information from DNA to t-RNA |
| 2. | Translation- Using the information in m-RNA to make protein |
| 3. | Repressor protein- Binds to an operator to stop enzyme synthesis |
| 4. | Operon- Structural genes, operator, and promoter |
An analysis of chromosomal DNA using the Southern hybridization technique does not use:
1. Electrophoresis
2. Blotting
3. Autoradiography
4. PCR
The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C.
1. A - translation B - transcription C - Erwin Chargaff
2. A -transcription B - translation C - Francis Crick
3. A - translation B - extension C - Rosalind Franklin
4. A - transcription B - replication C - James Watson
Select the correct option:
| Direction of RNA synthesis |
Direction of reading of the template DNA strand |
|
| 1. | 5'-3' | 3' - 5' |
| 2. | 3'-5' | 5' - 3' |
| 3. | 5' - 3' | 5' - 3' |
| 4. | 3' - 5' | 3' - 5' |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
1. sn RNA
2. hn RNA
3. 23 S rRNA
4. 5 S rRNA
Which one of the following is used as a vector for cloning genes into higher organisms?
1. Baculovirus
2. Salmonella typhimurium
3. Rhizopus nigricans
4. Retrovirus
DNA or RNA segment tagged with a radioactive molecule is called:
| 1. | vector | 2. | probe |
| 3. | clone | 4. | plasmid |
Which one of the following pairs of nitrogenous bases of nucleic acids is wrongly matched with the category mentioned against it?
1. Thymine, Uracil - Pyrimidines
2. Uracil, Cytosine - Pyrimidines
3. Guanine, Adenine - Purines
4. Adenine, Thymine - Purines
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