cell membranes

Question 1

what is passive transport

Answer 1

transport of small molecules that don’t require energy.

Question 2

what is bulk transport

Answer 2

transport large molecules

Question 3

what is active transport

Answer 3

transport of small molecules that require energy and transport proteins

Question 4

what are phospholipids

Answer 4

amphipathic molecules, having hydrophobic and hydrophilic regions

Question 5

what does the plasma membrane allow to pass

Answer 5

Oxygen, nutrients , waste

Question 6

what moves under the plasma membrane

Answer 6

Phospholipids can move within the bilayer. other lipids, some proteins drift

Question 7

what is osmosis

Answer 7

Diffusion of water across a selectively permeable membrane

Question 8

what is tonicity and the three types

Answer 8

the ability of a surrounding solution to cause a cell to gain or lose water. hypotonic- gains so much water it bursts. isotonic - normal water. hypertonic - losing water it shinks.

Question 9

what are channel proteins

Answer 9

corridors across the membrane

Question 10

what are aquaporins

Answer 10

water channels

Question 11

what are ion channels

Answer 11

gated and ungated channels

Question 12

whats are carrier proteins

Answer 12

proteins that change shape to translocate a soule-binding site across the membrane

Question 13

what does active transport require

Answer 13

energy in the form of ATP

Question 14

how do the large molecules cross the membrane

Answer 14

through vesicles ( this requires energy)

Question 15

what is excoytosis

Answer 15

secretion of cell contents via transport vesicles

Question 16

how do secretory veicles travel

Answer 16

moves from the golgi to microtubule to the plasma membrane. then bind to plasma membrane, two membranes combine and produce protein outside the cell