What is the difference between a muscular strength exercise and a muscular endurance exercise?

Muscular strength exercises build neuropathways to your brain, strengthening and building your muscle. Muscular endurance exercises work the muscle you already have. For example, weight lifting would be muscular strength because you're building muscle. Running would be muscular endurance because you're seeing how long those leg muscles can last. However, the two can also "intermix" and you usually do both at the same time.

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explanation:

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