Question

question 7 (2 points)
listen
which of the following correctly describes one method of transport across a cell membrane?
facilitated diffusion - requires a protein carrier, but no cellular energy
osmosis - the powered transport of molecules to create a concentration gradient
active transport - the engulfing of material outside of a cell by rearrangement of its cell membrane
diffusion - energetically expensive pumping of material out of cells
all of these are correct descriptions

Explanation:

Facilitated diffusion uses protein carriers to move substances across the cell - membrane down their concentration gradient and does not require cellular energy (ATP). Osmosis is the diffusion of water across a semi - permeable membrane, not the powered transport to create a concentration gradient. Active transport is the movement of substances against their concentration gradient using cellular energy and is not the engulfing of material (which is endocytosis/exocytosis). Diffusion is the passive movement of substances from high to low concentration and is not energetically expensive pumping.

Answer:

A. facilitated diffusion - requires a protein carrier, but no cellular energy