Question

multiple select question
select all that apply
how do active and passive transport differ?
only active transport can move a substance against its concentration gradient.
only active transport relies on carrier proteins.
only active transport relies on an expenditure of energy by the cell itself, usually from atp.
cells use active transport only for organic molecules. inorganic molecules and ions are only moved by passive transport.

Explanation:

Active transport moves substances against their concentration gradient and requires energy (usually ATP). Passive transport moves substances along their concentration gradient and does not require energy input from the cell. Both active and passive transport can use carrier - proteins. Cells use both active and passive transport for organic and inorganic molecules and ions.

Answer:

A. Only active transport can move a substance against its concentration gradient.
C. Only active transport relies on an expenditure of energy by the cell itself, usually from ATP.