Transport membrane

Question 1

most abundant lipid in the plasma membrane

Answer 1

phospholipids

Question 2

what are amphipathic molecules

Answer 2

contain both hydrophilic and hydrophobic regions

Question 3

what part of the phospholipid is hydrophilic

Answer 3

head

Question 4

protein bound to the surface of the membrane

Answer 4

peripheral

Question 5

protein that penetrates the hydrophobic core

Answer 5

integral protein

Question 6

integral proteins that span the membrane

Answer 6

transmembrane protein

Question 7

receptors for HIV

Answer 7

CD4 and CCR5

Question 8

facilitate the passage of water

Answer 8

aquaporin

Question 9

bind to molecules and change shape to shuttle them across the membrane

Answer 9

carrier proteins

Question 10

movement of molecules (solute) from an area of higher concentration to an area of lower concentration without any energy investment

Answer 10

diffusion

Question 11

diffusion of water

Answer 11

osmosis

Question 12

ability of a surrounding solution to cause a cell to gain or lose water

Answer 12

tonicity

Question 13

solute concentration outside = inside, no net movement of water

Answer 13

isotonic

Question 14

solute concentration outside > inside, cell loses water, cell becomes shriveled

Answer 14

hypertonic solution

Question 15

solute concentration outside < inside, cell gains water, cell may swell or burst

Answer 15

hypotonic solution

Question 16

control of solute concentration and water balance

Answer 16

osmoregulation

Question 17

provide corridors to allow specific molecules to cross the membrane

Answer 17

channel proteins

Question 18

moves substances against their concentration gradient

Answer 18

active transport

Question 19

optimum concentration of Na and K outside and inside the cell

Answer 19

outside: high Na, low K
inside: low Na, high K

Question 20

sodium potassium pump action

Answer 20

release 3 sodium ions outside, takes in 2 potassium ions

Question 21

membrane potential

Answer 21

voltage difference across a membrane

Question 22

transport protein that generates voltage across the membrane

Answer 22

electrogenic pump

Question 23

electrogenic pump in plants, fungi and bacteria

Answer 23

proton pump

Question 24

occurs when active transport of a solute indirectly drives transport of other substances

Answer 24

cotransport

Question 25

coupled transport protein for same direction

Answer 25

symport

Question 26

coupled transport protein for opposite direction

Answer 26

antiport

Question 27

movement of macromolecules into and out of the cell

Answer 27

bulk transport

Question 28

phagocytosis vs pinocytosis

Answer 28

phagocytosis - cellular eating pinocytosis - cellular drinking

Question 29

binding of ligands to receptor triggers vesicle formation

Answer 29

receptor-mediated endocytosis

Question 30

any molecules that binds specifically to a receptor site of another molecule

Answer 30

ligand