As the Body Ages, What Tends to Occur

question 33

Multiple Choice

As the body ages, what tends to occur?

• A)bone density and metabolism increase
• B)lean muscle mass increases
• C)fat decreases
• D)bone density and metabolism decrease

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Definitions:

Induced Fit

Induced fit is a model that describes how enzymes change shape upon substrate binding, enhancing their ability to perform catalytic activity.

Catalysis

The acceleration of a reaction rate by a molecule that is unchanged by participating in the reaction.

Sodium-Potassium Pump

A membrane-bound transporter enzyme present in many cell (plasma) membranes that pumps sodium out of cells while pumping potassium into cells, thus maintaining the concentration and electrical gradients of these ions.

Endocytosis

Process by which a cell takes in a small amount of extracellular fluid (and its contents) by the ballooning inward of the plasma membrane.