Lecture 11

Question 1

What is permeable through the plasma membrane?

Answer 1

gases and small uncharged molecules

Question 2

Channels

Answer 2

class 1 membrane transport proteins, facilitated transport = no energy, with gradient

Question 3

ATP-powered pumps

Answer 3

class 2, active transport, hydrolysis of ATP, against gradient

Question 4

Transporters

Answer 4

class 3, “secondary” active transport: uniporter, symporter, antiporter, does not use ATP – CO-TRANSPORT

Question 5

Uniporter

Answer 5

with gradient, facilitated transport, import large molecules

Question 6

Symporter

Answer 6

transporting 2 different molecules SAME direction | ex: Na+/lysine symporter

Question 7

Antiporter

Answer 7

transporting 2 different molecules DIFFERENT direction | ex: anion antiporter to transport CO2 by RBCs

Question 8

What powers the antiporter and symporter

Answer 8

moving molecules with its concentration gradient generate energy the membrane transport protein uses

Question 9

P-Class ATP pump

Answer 9

actual pump gets phosphorylated

Question 10

What membrane transport proteins are found on lysosomal membranes?

Answer 10

V and F-class ATP pumps

Question 11

V- & F-class ATP pumps

Answer 11

move H+ ions

Question 12

ABC superfamily ATP pump consists of

Answer 12

2 ATP binding domains and 2 transmembrane domains

Question 13

Purpose of transcellular transport

Answer 13

to keep environments balanced i.e.: blood @ pH7, parietal cells @ pH7, stomach lumen @ pH1