TEKS 4B-Cell Transport

An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes

• water to move into the cell.
• water to move out of the cell.
• solutes to move into the cell.
• solutes to move out of the cell.

Which means of particle transport is shown in the diagram?

• endocytosis
• exocytosis
• facilitated diffusion
• protein pump

Selectively permeable membranes are important in cell function. What makes a membrane selectively permeable?

• The ability to remove bacteria from the cell
• The ability to use energy to make proteins used in the cell
• The ability to modify, sort, and package proteins and lipids for storage or transport out of the cell
• The ability to allow needed materials to enter and wastes to exit as well as the ability to block unneeded materials from entering the cell

What happens during diffusion?

• Particles move slightly but stay in almost the same place.
• Particles move to different areas but always return to their starting point.
• Particles move from an area that is more concentrated to an area that is less concentrated.
• Particles move from an area that is less concentrated to an area that is more concentrated.

What material diffuses across a selectively permeable membrane from an area of higher concentration to an area of lower concentration through the process of osmosis?

• Lipid
• Protein
• Salt
• Water

What is the difference between diffusion and facilitated diffusion?

• Diffusion occurs when molecules spread out by moving randomly, while facilitated diffusion occurs when protein channels help molecules move across the cell membrane.
• Facilitated diffusion occurs when molecules spread out by moving randomly, while diffusion occurs when protein channels help molecules move across the cell membrane.
• There is no real difference between the two, except that facilitated diffusion happens slightly faster than diffusion.
• There is no real difference between the two, except that diffusion happens slightly faster than facilitated diffusion.

Which of the following accurately describes facilitated diffusion?

• Facilitated diffusion is the movement of substances requiring the use of energy.
• Facilitated diffusion does not involve the movement of substances across a membrane.
• Facilitated diffusion is the movement of substances in a slower, more deliberate way than diffusion.
• Facilitated diffusion is the movement of substances that cannot directly diffuse across the cell membrane.

Endocytosis is a process by which cells

• bring bulk material into the cell via vesicles.
• bring bulk material into the cell via pores.
• remove bulk material from the cell via vesicles.
• remove bulk material from the cell via pores.

Which of the following is not a way in which cells maintain homeostasis?

• They take in water and release waste.
• They respond to stimuli in their environment.
• They allow water to build up within their membranes.
• They maintain concentrations of water and minerals within certain levels.

How do unicellular organisms maintain homeostasis?

• They grow and reproduce.
• They transform energy.
• They respond to changes in their environment.
• All the other answers are correct