The cylindrical body or curved base of a bioreactor actually facilitates

1. The handling and maintenance of bioreactor

2. The mixing of the reactor content
3. Better oxygen transport
4. More accumulation of product

The Agitation system of bioreactor has

1. Flat bladed impeller

2. Sharp impellers

3. Foam breaker

4. Steamer

Increased surface area for oxygen transfer is a feature found specifically in

1. Simple stirred tank bioreactor

2. Sparged stirred-tank bioreactor

3. All stirred tank bioreactors

4. All bioreactors have this property

Quality control testing is not

A.      A part of downstream processing

B.      Include separation and purification

C.      Both A and B

D.     Vary from product to product

The formulation with suitable preservatives in the case of drugs has to undergo
 1. Thorough clinical trials
 2. Thorough strict separation techniques
 3. Thorough harsh heat shock control
 4. Thorough long restriction digestion

A molecular technique in which DNA sequences between two oligonucleotide primers can be amplified is known as

1. southern blotting
2. northern blotting
3. polymerase chain reaction
4. DNA replication

Agrobacterium tumefaciens is

1. a disease in humans that causes loss of sight
2. a bacterium that can be used to introduce DNA into plants
3. a fungi that is used to produce antibiotics in large amounts
4. a disease in humans that causes loss of weight

Vectors are

1. molecules that degrade nucleic acids
2. molecules that help in replication
3. molecules that are able to covalently bond to and carry foreign DNA into cells
4. molecules that protect host cells from invasion by foreign DNA

Bacterial cells protect their own DNA from degradation by restriction endonucleases by

1. methylating the DNA at the sites that the enzyme recognizes
2. deleting all recognition sites from the genome
3. not producing any restriction endonucleases
4. having anti restriction endonucleases

Which of the following enzyme is used to covalently bond foreign DNA to a vector plasmid?

1. DNA polymerase
2. Restriction endonuclease
3. DNA ligase
4. DNA helicase