pack 3- membrane transport

Question 1

name the passive transports

Answer 1

diffusion
facilitated diffusion
osmosis

Question 2

name the active transports

Answer 2

active transport
endocytosis
exocytosis

Question 3

what is bulk transport

Answer 3

movement of large quantities/ large molecules with the use of ATP energy.

Question 4

describe diffusion

Answer 4

movement from a region of high concentration to a region of low concentration down a concentration gradient. until equilibrium is reached

Question 5

describe facilitated diffusion

Answer 5

movement from a region of high concentration to a region of low concentration through carrier or channel proteins.

Question 6

describe osmosis

Answer 6

net movement of free water molecules from a lower solute concentration to a higher solute concentration through a partially permeable membrane

Question 7

describe active transport

Answer 7

movement from a region of low concentration to high concentration against a concentration gradient through a carrier protein using ATP energy.

Question 8

describe endocytosis

Answer 8

bulk transport into a cell.
substance attach to receptors on membrane forming a vesicle which pinches off enclosing the substance.

Question 9

describe exocytosis

Answer 9

bulk transport out of a cell.
vesicle within the membrane fuses with cell membrane and remaining vesicle become part of the membrane, releasing the substance.

Question 10

what type of molecule does diffusion move

Answer 10

small, lipid soluble, non-polar molecules
E.G- CO2 and O2

Question 11

what type of molecule does facilitated diffusion move

Answer 11

larger,hydrophilic molecules and ions
e.g- glucose

Question 12

what type of molecule does osmosis move

Answer 12

water

Question 13

what type of molecule does active transport move

Answer 13

ions, glucose and amino acids.
uptake of glucose in intestines (human)
uptake of mineral ions into root hair cells (plants)

Question 14

what type of molecule does endocytosis move

Answer 14

large molecules
eg- cholesterol, engulfed bacteria by white blood cells

Question 15

what type of molecule does exocytosis move

Answer 15

large molecules
eg- proteins (insulin), polysaccharides and neurotransmitters

Question 16

what do exocytosis and endocytosis rely on

Answer 16

fluidity of the membrane

Question 17

rate of diffusion can be affected by:

Answer 17

temperature
concentration gradient
movement
surface area
distance/thickness
size of molecule