Question

$GAATTC$ is the recognization site for which of the following restriction endonuclease

• A. $HindIII$
• B. $EcoRI$
• C. $BamI$
• D. $HaeIII$

Answer 1

The correct option is B $EcoRI$

EcoRI is a restriction endonuclease enzyme isolated from species E. coli. The Eco part of the enzyme's name originates from the species from which it was isolated, while the R represents the particular strain, in this case RY13. The last part of its name, the I, denotes that it was the first enzyme isolated from this strain. EcoRI is a restriction enzyme that cleaves DNA double helices into fragments at specific sites. It is also a part of the restriction modification system.

In molecular biology it is used as a restriction enzyme. EcoRI creates 4 nucleotide sticky ends with 5' end overhangs of AATT. The nucleic acid recognition sequence where the enzyme cuts is G/AATTC, which has a palindromic, complementary sequence of CTTAA/G. The / in the sequence indicates which phosphodiester bond the enzyme will break in the DNA molecule.

So the correct option is 'EcoRI'.