1.3 MEMBRANE PROTEINS Flashcards
integral membrane proteins have regions of hydrophobic R groups, what does this allow
strong hydrophobic interactions to occur which hold the integral membrane proteins within the phospholipid bilayer
what do integral membrane proteins have interactions with
the hydrophobic portion of the phospholipids
what are transmembrane proteins
proteins which span the entirety of the membrane
peripheral membrane proteins have what on their surface
hydrophilic R groups
where are peripheral membranes found
the surfaces of membranes
what do peripheral membrane proteins interact with
the surfaces of integral membrane proteins
define phospholipid bilayer
a barrier to ions and most uncharged polar molecules
what molecules can diffuse across the phospholipid bilayer
oxygen and carbon dioxide
what is facilitated diffusion
the passive transport of substances/molecules across the membrane through specific transmembrane proteins
what are channel proteins
multi subunit proteins in which subunits are arranged to form water filled pores which extend across the membrane
what two types of gated channel proteins are there
ligand gated and voltage gated
what controls a voltage gated channel
changes in ion concentration
what controls a ligand gated channel
the binding of a signal molecule
what does a protein pump do
uses active transport to transport substances across a membrane against their concentration gradient, these are transporter proteins coupled to an energy source
what is the electrochemical gradient and what does it determine
for a solute carrying a net charge; the concentration gradient and the electrical potential difference combine to form the electrochemical gradient
this determines the transport of the solute
