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Q.

Which of the following statement is correct?

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a

Sticky end producing restriction enzyme cuts the DNA strand a little away from centre of palindrome site.

b

More the efficiency of mineral usage by plant earlier is the exhaustion of soil fertility

c

Extraction of DNA fragments from gel piece is called spooling.

d

Cloning refers to the expression of foreign gene in heterologous host

answer is C.

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Detailed Solution

A restriction enzyme that produces "sticky ends" typically cuts the DNA strand at a specific site within a recognition sequence (often a palindromic sequence), and these cuts are made asymmetrically. 

Increased efficiency of mineral usage by plants prevents early exhaustion of fertility of soil.

Cloning is making multiple identical copies of any template DNA.

Extraction of DNA fragments from gel piece is called elution.

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Which of the following statement is correct?