In the lock-and-key model of enzyme action, the enzyme active site is thought of as ________.

A competitive inhibitor is one that ________.

“Physiologic conditions” for reactions within the body are approximately ________.

To what main class of enzymes does the enzyme that catalyzes the following reaction belong? O OH CH3——COO- → CH3—H—COO-

“Physiologic conditions” for reactions within the body are approximately ________.

Enkephalins are polypeptides that have ________.

Denaturation of a protein ________.

The molecule shown can be classified as a(an)

The fibrous protein responsible for the structure of hair and wool is ________.

Most enzymes are ________.