Chapter 5

When oxygen is plentiful during metabolism, it is said to be anaerobic.

• True

• False

A signal transduction pathway is a process that links the reception of a cell signal to a response within the cell.

• True

• False

Enzyme inhibitors are molecules that can disrupt metabolic reactions.

• True

• False

The release of a phosphate group at the tip of the triphosphate tail of ATP is what makes energy available to working cells.

• True

• False

An animal cell shrivels when it is isotonic compared to its environment.

• True

• False

An enzyme works by raising the activation energy of a chemical reaction.

• True

• False

The sum total of all chemical reactions that occur in an organism is called anabolism.

• True

• False

Packaging large molecules in vesicles, fusing with the plasma membrane, and spilling contents of vesicle outside cell is an active transport process called endocytosis.

• True

• False

The abbreviation ATP stands for adenosine triphosphate.

• True

• False

Which one of the following is TRUE?

• Enzymes are used up in chemical reactions.

• An enzyme's function depends on its three-dimensional shape.

• Enzymes are changed by the reactions they catalyze.

• Enzymes work generally on a broad range of substrates.