Question

From the following tools / techniques of genetic engineering, identify those which are required for cloning a bacterial gene in animal cells and choose the correct option :

I.	Endonuclease	II.	Ligase
III.	tumefaciens	IV.	Microinjection
V.	Gene gun	VI.	Lysozyme
VII.	Cellulase	VIII.	Electrophoresis

• A. II,III,IV,VI,VII,VIII
• B. II,III,V,VII,VIII
• C. I,II,IV,VI,VIII
• D. I,III,IV,V,VII

Answer 1

The Correct Option is C

• Endonuclease (I): These enzymes are crucial for cutting DNA at specific sites. They are used to cut both the bacterial gene and the plasmid vector to insert the gene of interest.
• Ligase (II): This enzyme is used to join the DNA fragment (the bacterial gene) to the plasmid or vector, completing the recombinant DNA.
• Agrobacterium tumefaciens (III): This bacterium is often used in plant genetic engineering, but not in cloning genes into animal cells. Therefore, it's not required for cloning a bacterial gene in animal cells.
• Microinjection (IV): This technique involves directly injecting foreign DNA into animal cells and is widely used in genetic engineering.
• Gene gun (V): The gene gun is a tool used to transfer DNA into cells by shooting microscopic gold or tungsten particles coated with DNA into the cells. This technique is not typically used for animal cells.
• Lysozyme (VI): Lysozyme can be used to break down the cell walls of bacteria, which is useful when extracting DNA, especially from bacterial cells.
• Cellulase (VII): Cellulase is used to break down plant cell walls and isn't necessary for the cloning of bacterial genes into animal cells.
• Electrophoresis (VIII): This technique is used to separate DNA fragments by size, which is important for verifying the DNA before and after the cloning process.

Thus, the correct tools for cloning a bacterial gene into animal cells are I, II, IV, VI, and VIII, making option (C) the correct choice.

Answer 2

The correct answer is: (C) I, II, IV, VI, VIII.

Cloning a bacterial gene in animal cells requires a series of steps that involve the use of specific enzymes and techniques. The correct tools and methods for cloning a bacterial gene into animal cells include:

• I. Endonuclease: An enzyme that cuts the DNA at specific sites, making it necessary for the process of gene cloning. It is used to cut the bacterial gene and prepare it for insertion into the animal cell.
• II. Ligase: An enzyme used to join the DNA fragment of interest (the bacterial gene) with the plasmid or vector DNA, creating a recombinant DNA molecule.
• IV. Microinjection: A technique used to directly inject the recombinant DNA into the animal cell, facilitating the introduction of the foreign gene into the host cell.
• VI. Lysozyme: An enzyme used to break down the cell wall of bacteria, often used to release bacterial DNA or proteins in the cloning process.
• VIII. Electrophoresis: A technique used to separate and analyze the DNA fragments. It helps in the identification of the gene of interest after it has been cut with endonucleases.

These tools and techniques are essential for the successful cloning of a bacterial gene into animal cells. The options not included, such as III. Tumefaciens, V. Gene gun, and VII. Cellulase, are not typically used for this specific process.