1. How did Hooke's work contribute to the cell theory?

He looked at thin slices of cork through his microscope and discovered little tiny "cells," which he named because he described the plant cells as resembling the cells where monks lived. He then developed this discovery into cell theory.

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