Question

passive transport is the movement of molecules across the cell membrane without requiring an input of cellular energy. identify which of these options are examples of passive transport. select two correct answers.
□ the movement of molecules from areas of high concentration to low concentration.
□ the sodium - potassium pump which uses atp.
□ the movement of water across the cellular membrane against the concentration gradient.
□ the facilitated diffusion of oxygen across the membrane.

Explanation:

Passive transport includes simple diffusion and facilitated diffusion, which move substances from high - to low - concentration without cellular energy input. Osmosis (the movement of water across the cell membrane) and the facilitated diffusion of oxygen across the membrane are examples of passive transport. Active transport, like the sodium - potassium pump, requires energy and moves substances against the concentration gradient. Convection is not a type of passive transport across cell membranes.

Answer:

The facilitated diffusion of oxygen across the membrane, The movement of water across the cell membrane against the concentration gradient (Note: Osmosis is the correct term for water movement in passive transport context and it is passive when moving along the concentration gradient, here we assume the general idea of water movement by diffusion which is passive; if it was against the gradient it would be active but the question likely means normal osmosis which is passive)