Which of these is an example of active transport? A Glucose molecules move against the concentration gradient across the cell membrane with the help of ATP.
B. Carbon dioxide molecules diffuse freely across the cell membrane.
C. Water molecules move down the concentration gradient across the cell membrane with the help of a channel protein.
D. Oxygen molecules become trapped inside the cell membrane with the help of ATP.

a. glucose molecules move agnst the concentration gradient across the cell membrane w the help of atp

Explanation:

active transport requires energy (atp) to push a molecule agnst its concentration gradient

also glucose molecules r too large to cross without the help of transmembrane proteins

and oxygen molecules r able to get thru by simple diffusion bc they r small enough

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