A cloning vector has two antibiotic resistance genes- for tetracycline and ampicillin. A foreign DNA

was inserted into the tetracycline gene. Non-recombinants would survive on the medium containing :

1. ampicillin but not tetracycline

2. tetracycline but not ampicillin

3. both tetracycline and ampicillin

4. neither tetracycline nor ampicillin

Concept Questions :-

Tools: Vectors: I
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Elution is:

1. Separating the restricted DNA fragments on agarose gel.

2. Staining the separate DNA fragments with ethidium bromide

3. cutting out of the separated band of DNA from the agarose gel and extracting them from the gel piece.

4. constructing rDNA by joining the purified DNA fragments to the cloning vector.

Concept Questions :-

Host & Desired DNA: II
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When isolating the pure DNA from a bacterial cell, the cell should not be treated with:

1. lysozyme

2. proteases

3. ribonuclease

4. deoxyribonuclease

Concept Questions :-

Host & Desired DNA: I
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A host cell normally does not take up a foreign DNA until it has been made competent to do so. This is because:

1. DNA is a hydrophilic molecule

2. DNA is a very large molecule

3. there are no receptors for DNA on the cell membrane

4. DNA is an inert molecule

Concept Questions :-

Host & Desired DNA: II
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Taq polymerase is used in the polymerase chain reaction because:

(1) It replicates DNA faster than other enzymes

(2) It is the only enzyme that can replicate DNA invitro

(3) It does not require an RNA primer to function

(4) It is thermostable 

Concept Questions :-

Large Scale Production: I
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The first type II restriction endonuclease discovered that could cut dsDNA specific site was:

1. EcoRI

2. SmaI

3. Hind II

4. Hind III

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Which statement regarding restriction endonucleases is NOT correct?

1. They recognize a specific base sequence in the DNA.

2. They are produced by bacterial cells as a primitive immune system.

3. They digest DNA by removing nucleotides from a free 3' end.

4. They often generate stick ends.

Concept Questions :-

Tools: Enzymes:II
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The first type II restriction endonuclease discovered that could cut dsDNA at specific site was:

1. EcoRI                        2. SmaI

3. Hind II                      4. Hind III

Concept Questions :-

Tools: Enzymes:II
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What limitation of traditional hybridization used for plant and animal breeding has been overcome by

the use of rDNA techniques?

1. High cost

2. Insertion of undesirable genes

3. Complexity of the procedure

4. Antigenicity of the product

Concept Questions :-

Intro & History: II
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Which of the following restriction sites is located within the gene for tetracycline resistance in the plasmid pBR322?

1. BamHI

2. Psti

3. Clal

4. Pvull

Concept Questions :-

Tools: Vectors:II
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