7-3 Biology

What is the main function of the cell membrane?

• Regulating what enters and leaves the cell

• Producing a strong supporting layer around the membrane

• Allowing individual cells to identify one another

What is diffusion?

• The process by which molecules move from areas of higher concentration to areas of lower concentration

• The diffusion of water through a selectively permeable membrane

• The movement of dissolved molecules from one side of the cell membrane to the other

• The process of taking material into the cell by means of infoldings of the cell membrane

What is osmosis?

• The process by which molecules move from areas of higher concentration to areas of lower concentration

• The diffusion of water through a selectively permeable membrane

• The movement of dissolved molecules from one side of the cell membrane to the other

• The process of taking material into the cell by means of infoldings of the cell membrane

What is the composition of nearly all cell membranes?

• A double-layered sheet called a lipid bilayer

• Protein molecules embedded in the lipid bilayer

• Carbohydrate molecules attached to the proteins

• All of the above

What is the main function of the cell wall?

• Regulating what enters and leaves the cell

• Providing support and protection for the cell

• Producing a strong supporting layer around the membrane

• Allowing individual cells to identify one another

What is the process by which molecules of a substance move from areas of higher concentration to areas of lower concentration?

• Diffusion

• Osmosis

• Facilitated diffusion

• Active transport

What conditions are present when equilibrium is reached in a solution?

• Equal concentration of solutes inside and outside the cell

• Higher concentration of solutes inside the cell

• Lower concentration of solutes inside the cell

• No change in concentration of solutes inside and outside the cell

What is the process of taking material into the cell by means of infoldings of the cell membrane?

• Diffusion

• Osmosis

• Endocytosis

• Exocytosis

What is the process of releasing large amounts of material from the cell?

• Diffusion

• Osmosis

• Endocytosis

• Exocytosis

What is the process of engulfing large particles by extensions of cytoplasm?

• Phagocytosis

• Pinocytosis

• Endocytosis

• Exocytosis