The source of taq polymerase used in PCR is a

(1) thermophilic fungus

(2) mesophilic fungus

(3) thermophilic bacterium

(4) halophilic bacterium

pBR_322, which is frequently used as a vector for cloning gene in E. coli is a/an

1. original bacterial plasmid

2. modified bacterial plasmid

3. viral genome

4. transposon

Which of the following statement is not true: 

(1) Transformation is a procedure through which a piece of DNA is introduced in a host bacterium

(2) Normally, the genes encoding resistance to antibiotics are considered useful selectable markers for E.coli

(3)  The normal E.coli cells do not carry resistance against antibiotics such as ampicillin, chloramphenicol, tetracycline or kanamycin

(4) Presence of one recognition sites within the vector will generate several fragments, which will complicate the gene cloning

Go through the statements:

A. During the processing of the prohormone "proinsulin" into the mature "insulin", C-peptide is removed from proinsulin.

B. In hydridoma technology, B-cells are fused with myeloma cells.

C. Genetic engineering has been successfully used for producing transgenic mice for testing safety of polio vaccine before use in humans.

D. Some of the characteristics of Bt cotton are high yield and resistance to bollworms.

E. An improved variety of transgenic basmati rice gives high yield and is rich in vitamin A.

F. Gray biotechnology' is referred to industrial process.

G. The polymerase chain reaction is a technique that is used for in vivo replication of DNA. 

How many statement(s) is wrong?

(1) One

(2) Two

(2) Four

(4) Six

Molecular probes used for identification of recombinant clone carrying the desired DNA insert can be:

A. Denatured double stranded DNA probes

B. doubles stranded RNA probes

C. Protein probes

D. Single stranded DNA probes.

(1) A, B

(2) B, C

(3) A, D

(4) A, B, C, D

Which is a natural genetic engineer of the plants?

(1)E.coli

(2)A. tumefaciens

(3)Rhizobium

(4)Pseudomonas

The thermostable enzyme Taq polymerase used in PCR technique was discovered by

(1)Alec Jeffrey

(2)Karry Mullis

(3)Temin

(4)Baltimore

To be useful in genetic engineering a vector must have

1. An origin for replication
2. Low copy number
3. Low rates of multiplication
4. Many cloning sites for the same enzyme

In 1960’s two enzymes were discovered in bacteria that were responsible for providing immunity against bacteriophages. One was Restriction Endonuclease and the other was

1. Methylase

2. Exonuclease

3. Aminotransferase

4. Terminal Transferase

 E.coli is  a commonly used host for gene cloning because

1. It is free from elements that interfere with replication and recombination of DNA

2. It is easy to transform

3. It supports replication of inserted DNA.

4. All of these