Agrobacterium tumifaciens

1. A pathogen of  angiosperms

2. It is able to deliver a piece of DNA known as T-DNA to transform bacterial cell and direct the cell to produce chemicals required by the pathogen

3. Ti plasmid of it is now modified into an expression vector

4. It's Ti plasmid is modified into a cloning vector which is no more pathogenic

In order to make the host cell competent

Divalent cations such as calcium are used-

A.      The divalent ions has to be in specific concentration

B.      They cause the DNA uptake by the cell

C.      They increase the efficiency with which DNA enters the bacterium through pores in its cell wall.

D.     Both B and C

rop segment codes for pBR322?

1. Resistance protein

2. Protein for replication

3. Proteins for translation

4. Cloning site

If a researcher start his work of DNA extraction from a plant cell, the very first enzyme, he would use will be

A.      Cellulase

B.      Protease

C.      Ribonuclease

D.     Chitinase

If a researcher has to use a bacterial cell to work with after cell wall breaking which enzyme he needs to use?

A.      Cellulase

B.      Chitinase

C.      Lysozyme

D.     Protease

If a researcher has to use a bacterial cell to isolate DNA from bacterial cell then to remove other nucleic acid, which enzyme should be used?

A.      DNAse

B.      Ribonuclease

C.      Protease

D.     Lysozyme

The precipitation of DNA out of the solution is done by adding

A.      Organic Acid

B.      HCl

C.      Ethanol

D.     Ketone

The end result of precipitation of DNA in suspension is seen

A.      In the form of dark solution

B.      In the form of effervescence

C.      In the form of fine threads

D.     In the form of bubbles

The precipitated DNA can be removed from the suspension

A.      By Filtration

B.      By giving a heat shock

C.      By spooling

D.     By gel electrophoresis

The synthesis of DNA in PCR will be in

1. 5’-3’

2. 3’-5’

3. It won't be depending on direction

4. For one strand 5’-3’ in another opposite to it