In a continuous culture system:
I:
The used medium is drained out from one side while the fresh medium is added from the other.
II:
The cells are maintained in their physiologically most active log/exponential phase.
III:
A larger biomass is produced leading to higher yields of desired proteins.
1.
Only I and II are correct
2.
Only I and III are correct
3.
Only II and III are correct
4.
I, II and III are correct
Subtopic: Large Scale Production |
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A plasmid contains two genes for resistance to separate antibiotics. One of the two is insertionally inactivated due to insertion of alien DNA.
| I: | The gene that was not inactivated helps in selecting the transformants. |
| II: | The gene that was insertionally inactivated helps in selection of recombinants. |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | I, II and III are correct |
Subtopic: Cloning Vector | Selection of Recombinant Transformants |
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In Polymerase chain reaction:
| 1. | the correct chronological sequence of steps is: Annealing of primer → Denaturation → Extension. |
| 2. | Taq polymerase is an RNA polymerase derived from a fungus. |
| 3. | millions to billions of copies of a specific DNA sample are made. |
| 4. | viral antigens cannot be detected in a given sample. |
Subtopic: Polymerase Chain Reaction: PCR |
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Which of the following statements will be correct regarding restriction endonucleases used in constructing recombinant DNA molecules?
| 1. | They are RNA molecules acting as enzymes. |
| 2. | The enzymes used in such experiments cut dsDNA randomly at any site. |
| 3. | They have been isolated from bacterial cells. |
| 4. | All restriction enzymes are thermostable and hence can be used in PCR procedures. |
Subtopic: Restriction Enzymes - Main Enzymes | Restriction Enzymes: Historical Background |
76%
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DNA fragments created by the action of restriction enzymes can be separated by agar gel electrophoresis where:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | larger the fragment size, the farther it moves in the gel |
| II: | the DNA fragments are forced to move towards anode under an electric field |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Separation and Isolation of DNA fragments |
81%
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A ‘continuous culture system’ method usually produces a larger biomass mainly because:
| 1. | the environmental conditions for the growth of the microbes are very easily maintained in such a system |
| 2. | such a system keeps most of the cells in their active/log exponential phase |
| 3. | it is very cheap with respect to other systems and hence cost of production is low |
| 4. | such a system uses larger sized bioreactors than other systems |
Subtopic: Large Scale Production |
74%
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Animal cells cannot be transformed with the help of:
| 1. | Microinjection | 2. | Ti Plasmid |
| 3. | Retroviral vectors | 4. | Liposomes |
Subtopic: Transforming Plant & Animal Cell |
66%
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Work of which of the following scientists was the basis upon which the discipline of biotechnology was founded?
| 1. | Cohen and Boyer |
| 2. | Watson and Crick |
| 3. | Hershey and Chase |
| 4. | Avery, Macleod and McCarty |
Subtopic: Restriction Enzymes - Main Enzymes |
89%
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The DNA sequence shown below is:
5’ – GAATTC – 3’
3’ – CTTAAG – 5’
5’ – GAATTC – 3’
3’ – CTTAAG – 5’
| 1. | the consensus sequence for prokaryotic promoter |
| 2. | the most common VNTR in the human genome |
| 3. | the recognition sequence of a common restriction endonuclease EcoR I |
| 4. | an intron within the eukaryotic split gene |
Subtopic: Restriction Enzymes - Main Enzymes |
94%
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Which of the following statements regarding restriction endonucleases used in recombinant DNA procedures is not true?
| 1. | They are isolated from bacteria |
| 2. | They are synthesized by bacteria as a mechanism of defence against bacteriophages |
| 3. | The type II enzymes, commonly used in rDNA experiments, cut dsDNA at specific recognition sequences |
| 4. | The bacterial DNA does not have recognition sequences for the restriction enzymes produced by itself |
Subtopic: Restriction Enzymes - Main Enzymes |
74%
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