How is a lily leaf cell different from a cat's skin cell?

a lily cell has a cell membrane but a cat cell does not.

a lily cell has a cell wall but a cat cell does not.

a lily cell has a nucleus but a cat cell does not.

a lily cell has cytoplasm but a cat cell does not.

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