cell metabolism - all of the biochemical reactions which occur within a living cell
anabolic pathways - require energy, synthesis of small molecules
catabolic pathways - release energy, degradation of complex molecules
the sodium / potassium pump
actively transports sodium ions out of the cell and potassium ions into the cell
induced fit
when the shape of active site changes slightly, so the active site fit closely around the substrate
competitive inhibitors
when an inhibitor molecule binds to the active site and stops the substrate from binding.
can be reversed by increasing substrate concentration
non competitive inhibitor
when an inhibitor binds to the allosteric site and changes the shape of the active site's shape. this stops the substrate binding to the active site and cannot be reversed
feedback inhibition
when the end product of a metabolic pathway binds to an enzyme at the start of the pathway.this stops the metabolic pathway and so prevents further synthesis of the end product
substrate
high affinity for the active site, can bind easily
product molecules have
low affinity for active site, so it can leave the active site
