Question

Match the options given in column I with those of column II with respect to the nomenclature of restriction enzyme EcoR I and select the correct answer from the codes given below.

	Column I		Column II
1	E	A	name of strain
2	co	B	name of genus
3	R	C	order of isolation
4	I	D	name of species

• A. 1-C, 2-A, 3-B, 4-D
• B. 1-C, 2-B, 3-A, 4-D
• C. 1-B, 2-D, 3-A, 4-C
• D. 1-D, 2-A, 3-B, 4-C

Answer 1

The correct option is C 1-B, 2-D, 3-A, 4-C

Restriction enzymes are a type of endonucleases that cleave the phosphodiester bonds present between the consecutive nucleotides within specific DNA sequences. More than 900 restriction enzymes have been isolated from over 230 strains of bacteria. EcoR I is a restriction endonuclease enzyme.

The diagram below illustrates what the different letters in EcoR I represent. It has been isolated from the bacterium Escherichia coli RY13.
Hence, the correct match is:

	Column I		Column II
1	E	A	name of genus
2	co	B	name of species
3	R	C	name of strain
4	I	D	order of isolation