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

(a) It is free from elements that interfere with replication and recombination of DNA

(b) It is easy to transform

(c) It supports replication of inserted DNA.

(d) All of these

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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

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An ideal plasmid for recombinant technology DNA technology  

  1. Has maximum amount of DNA
  2. Has relaxed replication control
  3. Many recognition sites for one RE
  4. All of these
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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

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Alec Jeffrey’s name is associated with

a. DNA sequencing

b. DNA fingerprinting

c. RNA sequencing

d. Gene cloning

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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

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The restriction enzymes most commonly used in rDNA technology are

1. Type 1 Restriction enzymes

2. Type II Restriction enzymes

3. Type III Restriction enzymes

4. Type IV Restriction enzymes

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Restriction enzymes do not act on the the DNA of the Host cell in which they are produced because
a. Host DNA is packed into chromosomes
b. Restriction enzymes are ineffective on host DNA
c. Host DNA does not have the restriction site for the Restriction enzymes.
d. Restriction site of host DNA is methylated.

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