a. The knee is to the ankle. b. The ear is to the nose. c. The nose is to the lips. d. The lips are to the teeth. e. The heart isto the sternum(breastbone). *

Proximal

lateral

superior

anterior

posterior

the wires in the toaster turning red and the toast crisping and turning brown

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