Carrier molecules help move substances from an area of low concentration to an area of high concentration by ____. 

A. diffusion
B. osmosis
C. filtration
D. active transport
E. passive mechanisms


D. active transport
In active transport, substances move across the cell membrane with the help of carrier molecules, from an area of low concentration of the substance to an area of high concentration.

Health Professions

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Fill in the blank(s) with correct word

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What will be an ideal response?

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