Question

1- Ethanol precipitation is used for the _____________of DNA from____________________

purification; Halobacterium salinarum alone
		purification; Halobacterium salinarum & strawberries
		purification; Halobacterium salinarum, strawberries & human cheek cells
		lysis; Halobacterium salinarum, strawberries & human cheek cells
		lysis; Halobacterium salinarum & strawberries

2- Osmotic shock is used for the isolation of DNA from:

		strowberries
		Halobacterium salinarum
		human cheek cells
		none of the above

Answer 1

1.Correct answer would be : purification; Halobacterium salinarum, strawberries & human cheek cells

Reason:Ethanol precipitation helps in the purification and concentration of DNA by making the DNA to precipitate out from the cells and it can be used to all cases mentioned.

2.Correct answer would be : Halobacterium salinarum

Reason: Halobacterium salinarum is a halophilic bacteria and changes in osmotic pressure or giving osmotic shock would isolate DNA from it as it would lyse the bacterial cells.