chp 13

Question 1

Active transport

Answer 1

moves molecules against concentration gradient

Question 2

Secondary transport

Answer 2

uses energy from one concentration gradient to drive the movement of another molecule against its gradient

Question 3

action potential

Answer 3

depolarization and rapid repolarization of a membrane

Question 4

method used to study single membrane channel acivity

Answer 4

patch clamp

Question 5

selectivity filter

Answer 5

ability for membrane channel to only transport specific molecules

Question 6

voltage gated

Answer 6

open and close in response to membrane potential changes

Question 7

ligand gated

Answer 7

open when a specific molecule binds

Question 8

mechanically gated

Answer 8

open due to mechanical stress

Question 9

diffusion

Answer 9

movement of molecules from high to low concentration

Question 10

simple diffusion requires __

Answer 10

no protein

Question 11

facilitaed diffusion

Answer 11

uses membrane proteins to help move molecules

Question 12

three structures that allow membranes to be permeable to polar

Answer 12

channel proteins, carrier proteins, aquaporins