Ch 7 Test Biology

energy-requiring process by which a cell expels wastes and secretes substances at the plasma membrane

• endocytosis
• exocytosis
• osmosis
• transport protein

net movement of particles from an area of higher concentration to an area of lower concentration

• transport protein
• osmosis
• diffusion
• dynamic equilibrium

diffusion of water across a selectively permeable membrane

• dynamic equilibrium
• osmosis
• diffusion
• facilitated diffusion

passive transport of ions and small molecules across the plasma membrane by transport proteins

• facilitated diffusion
• osmosis
• diffusion
• endocytosis

These organic compounds are found floating around in a sea of phospholipids. They are sometimes used for channels or pumps for moving substances in and out of the cell.

• transport proteins
• carbohydrates
• endocytosis
• phosopholipids

makes up most of the molecules in the plasma membrane

• transport proteins
• carbohydrates
• cholesterol
• lipids

a plasma membrane with components constantly in motion, sliding past one another within the lipid bilayer

• phospholipid bilayer
• fluid mosaic model
• plasma membrane
• phospholipid

plasma membrane layers composed of phospholipid molecules arranged with polar heads facing the outside and nonpolar tails facing the inside

• fluid mosaic model
• phospholipid bilayer
• phosopholipids
• selective permeability

This is an active transport process where the plasma membrane forms a pouch to surround something and bring it into the cell

• exocytosis
• endocytosis
• transport protein
• facilitated diffusion

occurs when substances move against the concentration gradient

• passive transport
• osmosis
• facilitated diffusion
• active transport