Passive Transport

The head of a phospholipid is:

• made of carbohydrates

• made of proteins

• hydrophillic

• hydrophobic

Cell membranes are constructed mainly of

• phospholipids

• protein pumps

• carbohydrates

• cholesterol

The tail of the phospholipid

• Made of carbohydrates

• Made of proteins

• Hydrophobic

• Hydrophilic

A membrane is permeable to hydrogen but impermeable to sodium ions.  Which molecule cannot move into the cell?

• Hydrogen

• Sodium ions

• Both hydrogen and sodium ions

• Neither hydrogen and sodium ions

Which of the following would be most likely to move through a phospholipid bilayer?

• Calcium ion

• Glucose

• Carbon Dioxide

• Water

Which of the following statements is correct about diffusion?

• It is very rapid over long distances.

• It requires an expenditure of energy by the cell.

• It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.

• It is an active process in which molecules move from a region of lower concentration to one of higher concentration.

What will happen if red blood cells are transferred to seawater?

• Water will leave the cells, causing them to shrivel and collapse.

• NaCl will be exported from the red blood cells by facilitated diffusion.

• The blood cells will take up water, swell, and eventually burst.

• NaCl will passively diffuse into the red blood cells.

Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells?

• The animal cell is in a hypotonic solution, and the plant cell is in an isotonic solution.

• The animal cell is in an isotonic solution, and the plant cell is in a hypertonic solution.

• The animal cell is in a hypertonic solution, and the plant cell is in an isotonic solution.

• The animal cell is in an isotonic solution, and the plant cell is in a hypotonic solution.