Lecture 4

Question 1

Passive transport

Answer 1

no energy required, solution moves down a concentration gradient

Question 2

simple diffusion

Answer 2

doesnt need membrane proteins

Question 3

facilitated diffusion

Answer 3

requires a channel or carrier protein

Question 4

Active transport

Answer 4

Uses ATP, solution moves up a concentration gradient against the gradient

Question 5

Primary active transport

Answer 5

ATP used directly by transporter

Question 6

Secondary active transport

Answer 6

ATP used indirectly by transporter

Question 7

Michaelis menten kinetics

Answer 7

describes reaction rate of one substrate and one product

Question 8

uniporter

Answer 8

passive transport of one ion across cell membrane

Question 9

antiporter

Answer 9

active transport that moves two ions across membrane in opposite directions

Question 10

symporter

Answer 10

active transport that moves two ions across membrane in same direction

Question 11

aquaporins (AQP)

Answer 11

water channels that cause increased water permeability

Question 12

Arginine vasopressin (AVP)

Answer 12

AVP is a hormone that regulates water permiability in the mammalian kidney

Question 13

voltage gated

Answer 13

opens/closes in response to changes in membrane potential

Question 14

ligand gated

Answer 14

opens/closes in response to presence/absence of ligand

Question 15

mechanically gated

Answer 15

opens/closes in response to cell shape

Question 16

Primary transport

Answer 16

energy released by ATP hydrolysis drives solute X movement against electrochemical gradient

Question 17

Secondary

Answer 17

movement of ion X down electrochemical gradient provides the energy needed for ion S to move against

Question 18

Role of ATPase and Costransporter of secondary transport

Answer 18

ATPas provides transport against gradient
Cotransporter transports in the direction of the electrochemical gradient

Question 19

monosaccharide transporter diagram

Answer 19

uniporters - glut2 and glut5
symporter - SGLT1