Jayden was goofing around with a friend when he fell and hit his head. soon after, he was having difficulty with his vision. it is possible that he sustained injury to the lobe.

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products