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H Bio Chapter 5

Cell membrane Structure and Function

QuestionAnswer
What is Active Transport? uses ATP, molecules move from low concentration to high concentration, against the gradient.
what is receptor mediated endocytosis? receptor proteins on the outer membrane have a binding site for a particular nutrient molecule. the right molecule contacts a receptor protein in a coated pit and pinches into a vesicle inside of the cytoplasm
What is Pincytosis? cellular drinking
What occurs in Endocytosis? the membrane engulfs the fluid, pinches off a vesicle with the fluid inside into the cytoplasm
What is phagocytosis? cellular eating
What is exocytosis? disposes unwanted materials into the extra-cellular fluid
what is the difference between osmosis and diffusion? osmosis is only water, and diffusion is anything. osmosis is across a membrane, diffusion is across anything
How does penicillin kill bacteria? it becomes one with the cellular walls of the bacteria, weakens it, and causes it to burst because of osmotic pressure.
what are cell membrane pumps? carrier proteins that assist in active transport.
which way does water move through a cell in an isotonic solution? the water moves into and out of the cell.
which way does water move through a cell in a hypotonic solution? the water moves into the cell.
which way does the water move through a cell in a hypertonic solution? the water moves out of the cell.
what is the driving force of diffusion? kinetic energy.
how is the concentration of molecules distributed if something is equilibrium? they are evenly distributed.
What is a passive transport? when the molecules move with the gradient, from high to low. it requires no ATP
how does a selectively permeable membrane help a cell? it helps maintain homeostasis by controlling what substances enter or leave cells
How does temperature effect the rate of diffusion? a high temperature makes the rate of diffusion faster.
Created by: 16swheeler
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