Uwo Bio 212 Exam 2 Test Bank Questions And
Answers Verified by Experts
Depolarization The process during the action potential when sodium is rushing into the
cell causing the interior to become more positive.
Repolarization Return of the cell to resting state, caused by reentry of potassium into the
cell while sodium exits the cell.
When does repolarization occur? with the opening of voltage-gated K+ channels
Hyperpolarization The movement of the membrane potential of a cell away from rest
potential in a more negative direction.
When does hyperpolarization occur? when ion channels open and negative ions enter cell
and/or positive ions leave the cell
threshold potential The minimum membrane potential that must be reached in order for an
action potential to be generated.
, Uwo Bio 212 Exam 2 Test Bank Questions And
Answers Verified by Experts
channel proteins provide corridors that allow a specific molecule or ion to cross the
membrane
Pump active transport mechanism that works against electrochemical gradients
Osmosis diffusion of water across a selectively permeable membrane
Evaporation The change of a substance from a liquid to a gas
differential gene expression The expression of different sets of genes by cells with the
same genome.
regulatory region DNA sequence appearing in front of a gene; it is used for regulation
rather than to encode a protein
Answers Verified by Experts
Depolarization The process during the action potential when sodium is rushing into the
cell causing the interior to become more positive.
Repolarization Return of the cell to resting state, caused by reentry of potassium into the
cell while sodium exits the cell.
When does repolarization occur? with the opening of voltage-gated K+ channels
Hyperpolarization The movement of the membrane potential of a cell away from rest
potential in a more negative direction.
When does hyperpolarization occur? when ion channels open and negative ions enter cell
and/or positive ions leave the cell
threshold potential The minimum membrane potential that must be reached in order for an
action potential to be generated.
, Uwo Bio 212 Exam 2 Test Bank Questions And
Answers Verified by Experts
channel proteins provide corridors that allow a specific molecule or ion to cross the
membrane
Pump active transport mechanism that works against electrochemical gradients
Osmosis diffusion of water across a selectively permeable membrane
Evaporation The change of a substance from a liquid to a gas
differential gene expression The expression of different sets of genes by cells with the
same genome.
regulatory region DNA sequence appearing in front of a gene; it is used for regulation
rather than to encode a protein
