Lecture 17: Solute Transport 3

Question 1

types of active transport

Answer 1

ATPase, symporter, and antiporter

Question 2

antiporter

Answer 2

carries 2 different ions or molecules, but in different directions

Question 3

symporter

Answer 3

carries 2 different ions or molecules, both in the same direction

Question 4

what form does roots takes N up as

Answer 4

NO3- (nitrate) or NH4+ (Ammonium)

Question 5

phosphate transporters

Answer 5

PHT1 for phosphate (Pi) uptake and transport

Question 6

at what concentration are low affinity transporters used

Answer 6

high concentration

Question 7

what is NHX (sodium/proton exchangers)

Answer 7

cation/proton anitporter

Question 8

H+ pumping ATPase

Answer 8

primary active transport system by pumping protons out of the cell and produce electric and pH gradients

Question 9

what does the proton electrochemical gradient do

Answer 9

driving processes of other transporters

Question 10

t/f: does high-affinity K+ transport require energy

Answer 10

yes 2xATP

Question 11

Stomatal movement is highly correlated with ___________ (under conditions of sufficient water status)

Answer 11

photosynthetically active radiation

Question 12

what does blue light do

Answer 12

proton accumulation due to stimulation of H+-ATPase

Question 13

what is guard cell osmotic adjustment mediated by

Answer 13

the accumulation of K+ and anions Malate 2- or Cl-, accumulation of sucrose from starch or photosynthesis

Question 14

membrane transport/osmotic adjustment controls ___________ in petals

Answer 14

sleep movement