Lecture 8 Flashcards
What concentration does passive transport move to?
an area of high concentration to low concentration
What’s the name of the channel proteins?
aquaporins
What sugar acts as a carrier protein?
glucose
What concentration does active transport move to?
area of low-concentration to high-concentration; against the concentration gradient
What transport moves against the concentration gradient?
active transport
What does a sodium potassium pump do?
uses ATP hydrolysis to move ions against the concentration gradient
What is co-transport?
coupled transport by a membrane protein
When does co-transport happen?
when transport of one substance indirectly drives transport of other substances
What do plants use to drive transport of nutrients into the cell against nutrients concentration gradient?
The gradient of hydrogen ions
What does a protein pump do
actively transports H+ ions from inside the cell
What is an electrogenic pump?
a transport protein that generates voltage across a membrane
What is membrane potential?
the voltage difference across a membrane
How is voltage created?
by differences in the distribution of positive and negative ions across a membrane
Where are proton pumps located?
plant/animal, fungi and bacteria
Where are sodium potassium pumps located?
animal cells
