Active Transport Quiz

During active transport, what is required to move materials across the cell membrane?

• water

• energy

• oxygen

• cytoplasm

Which statement best describes diffusion?

• Diffusion requires the cell to use energy.

• Diffusion is an example of active transport.

• Diffusion occurs when particles spread from areas where they are less concentrated to areas where they are more concentrated.

• Diffusion occurs when particles spread from areas where they are more concentrated to areas where they are less concentrated.

What is the diffusion of water across a semipermeable membrane called?

• diffusion

• osmosis

• exocytosis

• endocytosis

What is the process that uses energy to move substances across a partially permeable membrane or concentration gradient?

• osmosis

• diffusion

• active transport

• facilitated diffusion

What term is used when the concentrations of solutes inside and outside a cell are in equilibrium?

• hypotonic

• isotonic

• hypertonic

• polytonic

What is the process by which water passes into or out of a cell?

• dispersion

• phagocytosis

• osmosis

• equilibrium

Why does active transport require energy to move molecules of a substance across a cell membrane?

• Lack of the substance makes the cell weak.

• The substance moves from low to high concentration, against the concentration gradient.

• The cell membrane is very thick.

• The substance moves from high to low concentration, with the concentration gradient.

Crystals of dye, when placed in a beaker of water, eventually spread evenly throughout the water. This is an example of

• osmosis.

• diffusion.

• phagocytosis.

• active transport.

Which molecule is MOST LIKELY to diffuse through a cell membrane without the use of energy?

• protein

• water

• DNA

• starch

Which statement about diffusion is true?

• Energy is required for molecules to move across a membrane.

• Diffusion happens when molecules move from a low concentration to a high concentration

• Diffusion happens when molecules move from a high concentration to a low concentration.

• During diffusion, molecules move only in one direction.