BIOLOGY 2e EXAM QUICK
REVISION QUESTIONS AND ANSWERS
membrane potential & how it's maintained by sodium-
potassium pump
electrical charge difference (voltage) that occurs across
the plasma
The pump mantains the concentration gradient by
exchanginf 2 K out for 1 NA in.
Major features of primary active transport
More substances across membrane
Makes ATP
Major features of facilitated diffusion
Passive
Using specialized proteins (channels carriers)
Proteins to assist molecules in moving across cell
Secondary active transport
Form of active transport which does not use ATP as an
energy source; rather, transport is coupled to ion diffusion
down a concentration gradient established by primary
active transport.
(Boulder off cliff analogy)
Passive w gradient
Active movement of another driven by the passive
Oxidation
loss of electrons
reduction
REVISION QUESTIONS AND ANSWERS
membrane potential & how it's maintained by sodium-
potassium pump
electrical charge difference (voltage) that occurs across
the plasma
The pump mantains the concentration gradient by
exchanginf 2 K out for 1 NA in.
Major features of primary active transport
More substances across membrane
Makes ATP
Major features of facilitated diffusion
Passive
Using specialized proteins (channels carriers)
Proteins to assist molecules in moving across cell
Secondary active transport
Form of active transport which does not use ATP as an
energy source; rather, transport is coupled to ion diffusion
down a concentration gradient established by primary
active transport.
(Boulder off cliff analogy)
Passive w gradient
Active movement of another driven by the passive
Oxidation
loss of electrons
reduction
