A mixture containing DNA fragments, a, b, c and d, with molecular weights of a+b = c, a > b and d>c, was subjected to agarose gel electrophoresis. The positions of these fragments from anode to cathode sides of the gel would be

(1) b, a, c, d

(2) a, b, c, d

(3) c, b, a, d

(4) b, a, d, c

Which of the following DNA sequences qualifies to be designated as a palindrome?

(1) 5 - GACCAG - 3’ in one strand

(2) 3’- GACCAG - 5’ in one strand

(3) 5’- GACGAG- 3’ 3’- CTGGTC - 5’

(4) 5’- AGCGCT - 3’ 3’- TCGCGA - 5’

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

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

 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

A gene has been inserted into a vector for the purpose of cloning the sequence only. This vector is called

a.  Suppression vector

b. Expression vector

c. Cloning vector

d. None of these

Electroporation facilitates insertion of foreign DNA into the cell by

1. Changing the porocity of the membrane

2. Changing the electrical potential of the membrane

3. Lysing the cell wall

4. Active transport

Alec Jeffrey’s name is associated with

a. DNA sequencing

b. DNA fingerprinting

c. RNA sequencing

d. Gene cloning

The names associated with construction of first Recombinant DNA are

a. Arber, Nathans, Smith

b. Annie Chang, Boyer, Berg, Cohen

c. Howard Temin, Brenner, Sharp

d. Tim Hunt, Hartwell, Nurse