2. Cell Chemistry & Cell Components

Plasma membranes are said to be

(a) Impermeable

(b) Freely permeable

(c) Selectively permeable

(d) Actively permeable

(e) Slightly permeable

____ ion concentration is high in extracellular fluids, and____ion concentration is high in the cytoplasm.

(a) Calcium; magnesium

(b) Chloride; sodium

(c) Potassium; sodium

(d) Sodium; potassium

The movement of water across a membrane from an area of low solute concentration to an area of higher solute concentration is known as

(a) Osmosis

(b) Active transport

(c) Diffusion

(d) Facilitated transport

(e) Filtration

A molecule that blocks the ion channels lining integral proteins in the plasma membrane would interfere with

(a) Cell recognition

(b) The movement of lipid-soluble molecules

(c) Producing changes in the electrical charges across a plasma membrane

(d) The ability of protein hormones to stimulate the cell

(e) The cell's ability to divide