7.3 Cellular Transport

What is the process called where molecules move from an area of higher concentration to an area of lower concentration?

• Osmosis

• Diffusion

• Active Transport

• Endocytosis

What happens to concentrations when diffusion occurs over a long enough time?

• They become uniform and reach dynamic equilibrium.

• They remain the same.

• They decrease.

• They increase.

At which stage does the ink become evenly blended in the water?

• Diffusion begins

• Five-minute time lapse

• Ten-minute time lapse

• Never

Facilitated diffusion uses ______ to move ions and small molecules across the plasma membrane.

• Lipids

• Transport proteins

• Carbohydrates

• Nucleic acids

Which statement is true about osmosis?

• It requires energy

• It involves the movement of solutes

• It is a type of active transport

• It is the diffusion of water across a selectively permeable membrane.

What is the result of osmosis in cells?

• Increased solute concentration

• Balanced water concentration

• Decreased water concentration

• Increased energy production

In osmosis, water molecules move from an area of ________ concentration to an area of ________ concentration.

• High, low

• Low, high

• Equal, equal

• None, none

Which side has a greater sugar concentration before osmosis?

• Left

• Right

• Both

• Neither

What is a hypertonic solution?

• A solution with lower concentration of solutes than the cytoplasm

• A solution with higher concentration of solutes than the cytoplasm

• A solution with equal concentration of solutes as the cytoplasm

• None of the above.

In exocytosis, materials are expelled from the cell. Fill in the blank: The vesicle fuses with the ______ to release its contents outside the cell.

• Nucleus

• Cell membrane

• Mitochondria

• Ribosome