Question

passive transport review worksheet
part a: complete the table below.

solution outside the cell	hypertonic	hypotonic	isotonic
the direction in which the water will move (diffuse)	______ of the cell	______ the cell	both in and out equally
effect on the cell...	the cell will ______	the cell will ______	the cell will remain the same

part b: choose the best answer.

1. which of the following is not a component of the cell membrane?

a) phospholipids
b) proteins
c) nucleic acids
d) cholesterol

1. which of the following describes a phospholipid bilayer?

a) one layer of phospholipids with proteins attached
b) two layers of phospholipids with hydrophilic heads facing outwards
c) a single layer of hydrophobic tails facing outwards
d) two layers of phospholipids with hydrophobic heads facing outwards

1. what type of transport does not require energy?

a) active transport
b) endocytosis
c) passive transport
d) exocytosis

1. which of the following is an example of passive transport?

a) endocytosis
b) osmosis
c) exocytosis
d) sodium - potassium pump

1. diffusion is the movement of molecules from:

a) low concentration to high concentration
b) high concentration to low concentration
c) equal concentrations
d) outside the cell to inside only

1. in osmosis, water moves across a membrane from:

a) an area of low solute concentration to an area of high solute concentration
b) an area of high solute concentration to an area of low solute concentration
c) equal solute concentrations
d) both directions equally

Explanation:

• Part A: In a hypertonic solution, there is more solute outside the cell than inside. Water moves out of the cell, causing it to shrink. In a hypotonic solution, there is less solute outside the cell than inside. Water moves into the cell, causing it to swell. In an isotonic solution, the solute amount outside and inside the cell is equal, and water moves in and out equally with no net change to the cell's size.
• Part B:
• 1. Nucleic acids are not components of the cell - membrane. Phospholipids, proteins, and cholesterol are.
• 2. A phospholipid bilayer consists of two layers of phospholipids with hydrophilic heads facing outwards.
• 3. Passive transport does not require energy, while active transport, endocytosis, and exocytosis do.
• 4. Osmosis is an example of passive transport. Endocytosis and exocytosis are forms of active transport, and the sodium - potassium pump is involved in active transport.
• 5. Diffusion is the movement of molecules from high concentration to low concentration.
• 6. In osmosis, water moves from an area of low solute concentration (high water concentration) to an area of high solute concentration (low water concentration).

Answer:

• Part A:
• Hypertonic: More; Out; Shrink
• Hypotonic: Less; Into; Swell
• Isotonic: Equal; Equally; No net change
• Part B:
• 1. c) nucleic acids
• 2. b) two layers of phospholipids with hydrophilic heads facing outwards
• 3. c) passive transport
• 4. b) osmosis
• 5. a) low concentration to high concentration
• 6. a) an area of low solute concentration to an area of high solute concentration