Ch 13 Concepts of Transport

Question 1

The plasma membrane is

Answer 1

selectively permeable

Question 2

Proteins in plasma membrane act as

Answer 2

ion channels

transporters

pumps

Question 3

passive diffusion

Answer 3

movement with concentration gradient

Question 4

active transport

Answer 4

movement against concentration gradient

Question 5

Na+ is more concentrated in

Answer 5

extracellular

Question 6

K+ is more concentrated in

Answer 6

intracellular

Question 7

Ca+ is more concentrated

Answer 7

extracellular

Question 8

Mg+ is more concentrated in

Answer 8

intracellular

Question 9

Cl- is more concentrated in

Answer 9

extracellular

Question 10

intracellular pH is

Answer 10

7.0

Question 11

extracellular pH is

Answer 11

7.4

Question 12

transport via simple diffusion and facilitated diffusion requires no

Answer 12

energy

Question 13

transport via active transport requires

Answer 13

energy

Question 14

protein transport requires a____________ change of the protein

Answer 14

conformational

Question 15

If two substances are in solution together they will not interfere with diffusion of eachother. True or False

Answer 15

True

Question 16

Net movement depends on (diffusion)

Answer 16

concentration gradient

particle size

permeability of compound in trying to pass barrier

Question 17

simple/passive diffusion uses

Answer 17

no carrier protein interaction

can use pores or channels

Question 18

facilitated diffusion uses

Answer 18

a carrier protein

binding occurs

Question 19

Lipid diffusion through lipid bilayer

Answer 19

O, N, CO2, and alcohols highly lipid soluble

rate of diffusion dependent on degree of lipid solubility

Question 20

Lipid insoluble compounds and water through protein channels

Answer 20

pore channels for small molecules

pore diameter and charge on amino acids determines selectivity of passge

Question 21

Two types of gates used in channel protein

Answer 21

voltage gated channels=electrical

ligand-gated channels=chemical

Question 22

potassium channels selectively filter for

Answer 22

K+

Question 23

Sodium channels are lined with amino acids that are highly

Answer 23

negative

Question 24

(voltage gating) sodium and potassium channels open when the inside of cell becomes

Answer 24

positively charged

Question 25

(chemical gating) binding a molecule may

Answer 25

open or close the gate

Question 26

Binding affinity in carrier proteins is measured by

Answer 26

Km

Question 27

If transporters are saturated they are said to be

Answer 27

maxed out (Vmax)

Question 28

Km

Answer 28

=solute concentration that will give 1/2Vmax

Question 29

Osmosis

Answer 29

semipermeable membrane allows movement of H2O but not solutes

moves from high to low via aquaporins

goal is to equalize concentration of solutes

Question 30

Hydrostatic pressure

Answer 30

prussure applied to stop flow of water from high to low

Question 31

Isotonic

Answer 31

pressure same on inside and outside of cell

Question 32

Hypotonic

Answer 32

movement of water into cell

increases cell volume

pressure greater in cytosol

Question 33

Hypertonic

Answer 33

movement of water out of cell

cell will shrink

pressure greater outside of cell