Membranes & Organelles Flashcards
1
Q
What types of molecules freely diffuse across cell membranes?
A
small & non-polar
2
Q
Steroids & Benzene are examples of molecules that are _____ & _____ and as a result cross the cell membrane how?
A
large & non-polar
slow/freely
3
Q
CO2 & O2 are examples of molecules that are _____ & _____ and as a result cross the cell membrane how?
A
small & non-polar
fast/freely
4
Q
H2O & Ethanol are examples of molecules that are _____ & _____ and as a result cross the cell membrane how?
A
small & polar
slow/freely
5
Q
What types of molecules need transport (do not freely diffuse) across cell membranes?
A
Large & polar or small (any size) & charged
6
Q
Does glucose freely diffuse across the cell membrane?
A
No
7
Q
Do amino acids freely diffuse across the cell membrane?
A
No, but they are small and can go through some channels
