C12 membrane transport

Question 1

move molecules from one side of membrane to other using conformational change

Answer 1

carrier proteins

Question 2

small pore that allows specific ions to flow by diffusion

Answer 2

channel proteins

Question 3

Na+ is kept in high concentration (inside/outside) cell

Answer 3

outside (extracellular)

Question 4

K+ is kept in high concentration (inside/outside) cell

Answer 4

inside (intracellular)

Question 5

Cl- is kept in high concentration (inside/outside) cell

Answer 5

outside

Question 6

? transport moves molecules down a concentration gradient

Answer 6

passive

Question 7

? transport moves molecules against a concentration gradient

Answer 7

active

Question 8

facilitated diffusion

Answer 8

passive transport specific for the molecule

Question 9

function of insulin

Answer 9

stimulates glucose uptake in muscle and fat cells

Question 10

Humans have ? different glucose transporters

Answer 10

5

Question 11

insulin secretion is triggered by ?

Answer 11

increases in blood sugar

Question 12

the cytoplasmic side of the plasma membrane us usually kept (negative/positive)

Answer 12

negative

Question 13

the electrical gradient is derived from ?

Answer 13

the membrane potential

Question 14

the chemical gradient is derived from ?

Answer 14

relative concentration of individual charged molecule

Question 15

The ? pump is responsible for the membrane potential in animal cells

Answer 15

Na+,K+ ATPase

Question 16

The Na+,K+ ATPase pumps ? Na out and ? K in

Answer 16

3,2

Question 17

P-type pumps catalyze ?

Answer 17

autophosphorylation

Question 18

The Na/glucose transporter is an example of (symport/antiport)

Answer 18

symport

Question 19

The Na+/H+ exhanger is an example of (symport/antiport)

Answer 19

antiport

Question 20

principal passive glucose uniport

Answer 20

GLUT 2

Question 21

insulin-regulated glucose transporter

Answer 21

glut 4

Question 22

function of Ca++ ATPases

Answer 22

maintain very low intracellular CA++ concentration

Question 23

Intracellular Ca++ can be used for ?

Answer 23

signalling

Question 24

Plants, fungi and bacteria rely primarily on gradients from ? to drive secondary transport

Answer 24

H+

Question 25

Three ways to gate ion channels

Answer 25

voltage, ligand, stress

Question 26

the acetyl choline receptor is a ? channel

Answer 26

na+

Question 27

channels spontaneously fluctuate between open and closed? t/f

Answer 27

true

Question 28

channel that establishes resting potential of -70mV

Answer 28

K+

Question 29

Depolarization of nerve cells is a result of ? (2)

Answer 29

stimulation followed by Na+ flow into cell

Question 30

Opening of Na+ channel in nerve cell occurs around this membrane potential

Answer 30

-50mV

Question 31

Na+ channel in nerve cells closes around this membrane potential?

Answer 31

+50mV

Question 32

? flow out of cell repolarizes cell

Answer 32

K+

Question 33

The Na+ channel is ? gated

Answer 33

voltage

Question 34

? cells wrap nerve axons to provide electrical insulation

Answer 34

schwann

Question 35

Is transmitted the length of the axon without additional energy input

Answer 35

action potential

Question 36

synapse

Answer 36

junction between two neurons where electrical signal is converted to neurotransmitter

Question 37

? channel triggers release of neurotransmitter

Answer 37

Ca++

Question 38

novacain function

Answer 38

blocks Na+ ion channels. prevents action potentials and therefore pain.

Question 39

nerve gas function

Answer 39

inhibitor of acetylcholine esterase. acetylcholine accumulates and keeps nerve on.

Question 40

alpha-bungarotoxin function

Answer 40

inhibitor of acetylcholine receptor. nerve cannot be stimulated by neurotransmitter

Question 41

Botox function

Answer 41

inhibits neurotransmitter release. muscles cannot be stimulated

Question 42

Prozac

Answer 42

increase serotonin levels

Question 43

provides info for how individual ion channels behave

Answer 43

patch-clamp recording

Question 44

oubain function

Answer 44

inhibiting na,k pump, inhibits glucose uptake by epithelial cells