Carrier molecules are required for: e. both facilitated diffusion AND active transport.
Diffusion refers to the movement of gas molecules from a region of higher concentration to a region of lower concentration until an equilibrium is attained (reached).
This ultimately implies that, molecules generally move from areas of higher concentration to areas of lower concentration during diffusion.
Active transport can be defined as the movement of ions or molecules from a region of lower concentration to a region of higher concentration across a cellular membrane and against a concentration gradient.
Carrier molecules can be defined as molecules that are actively involved in the transportation of proteins, DNA or RNA, electrons through the electron transport chain.
Generally, carrier molecules are typically required for both facilitated diffusion and active transport through the use of cellular energy.
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