The restriction endonuclease Eco R-I recognises and cleaves DNA sequence as shown below
5' - G A A T T C - 3'
3' - C T T A A G - 5'
What is the probable number of cleavage sites that can occur in a 10 kb long random DNA sequence?

A. 10                    B. 2                   C. 100                D. 50

Dear Student. 
Please find below the solution to the asked query. 
 

Eco RI is a restriction endonucleases after that cut after 6 bp. i.e (1/4)6 = 1/4096. 
This means it cleaves once in 4096 bp.

Its given in question DNA sequence is 10Kb i.e 10000bp

Therefore, 10000/4096 = 2.4.

The correct answer is b. 2

Hope this information will clear your doubts about the topic. 

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