LIFE SCIENCE

Detailed explanation-1: -The letter ‘co’ stands for coli in EcoRI (species of bacteria, from where it is obtained).

Detailed explanation-2: -EcoRI comes from Escherichia coli RYB strain. In EcoRI, ‘E’ comes from the genus ‘Escherichia’and ‘co’ comes from the species ‘coli’. The letter ‘R’ is derived from the name of the strain RYB.

Detailed explanation-3: -In EcoRI, Eco represents the species of bacteria from which it is isolated i.e. Escherichia coli. R represents the strain of the bacteria which is RY-13 in this case.

Detailed explanation-4: -Enzyme EcoRI is a restriction endonuclease and its name represents the following: E→ Escherichia, co → coli, R→RY13 strain, I→ 1st enzyme isolated from E.

Detailed explanation-5: -The primary structure of Eco-RI consists of 277 amino acids with a molecular weight of 30928.1 Daltons. Given that the average amino acid has a molecular mass of 100 Daltons, the molecular weight is very close to but slightly above the average weight that would be expected.