BIO!!
the concentration gradient: ATP
The force driving simple diffusion is _____, while the energy source for active transport is _____
Only certain molecules can cross a cell membrane.
Which of the following most accurately describes selective permeability?
lysocomes
a bacterium engulfed by a white blood cell through phagocytosis will be digested by cells contained in
diffusion
a passive process in which molecules move from a region of higher concentration to a region of lower concentration
active vs passive transport
active needs energy; passive does not need energy (diffusion)
aquaproins
allows water molecules to move faster across the cell membrane
selective permeability
characteristic of the plasma membrane which allows certain materials in or out of the cell
Mitochondria
cyanide binds with a least one molecule in ATP, if a cell membrane contains cyanide, most of it will be found here
Osmosis
diffusion of water; how polar H2O gets across the membrane
smaller nonpolar molecules
what can most easily move across the membrane
it maintains fluidity by preventing tight packing
what happens when a membrane is cold
cholesterol restrains movement of phospholipids
what happens when a membrane is hot
Phagocytosis
white blood cells engulf bacteria using this