Q. No.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 |
Transformation was discovered by:
1. Meseson and Stahl
2. Hershey and Chase
3. Griffith
4. Waston and crick
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 |
Which enzyme(s) will be produced in a cell in which there is a non-sense mutation in the lac Y gene?
| 1. | Lactose permease |
| 2. | Transacetylase |
| 3. | Lactose permease and transacetylase |
| 4. | β - galactosidase |
Removal of RNA polymerase III from nucleoplasm will affect the synthesis of:
1. tRNA
2. hnRNA
3. mRNA
4. rRNA
PCR and Restriction Fragment Length Polymorphism are the methods for:
1. Study of enzymes
2. Genetic transformation
3. DNA sequencing
4. Genetic fingerprinting
If one strand of DNA has the nitrogenous base sequence as ATCTG, what would be the complementary RNA strand sequence?
1. TTAGU
2. UAGAC
3. AACTG
4. ATCGU
1. sn RNA
2. hn RNA
3. 23 S rRNA
4. 5 S rRNA
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