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(B) $1$. Simple diffusion occurs along the concentration gradient but does not require carrier proteins.$2$. Facilitated diffusion occurs along the co

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Facilitated diffusion

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(B) $1$. Simple diffusion occurs along the concentration gradient but does not require carrier proteins.$2$. Facilitated diffusion occurs along the concentration gradient and requires specific carrier proteins to transport molecules across the membrane.$3$. Active transport requires energy $(ATP)$ and moves molecules against the concentration gradient.$4$. Therefore,diffusion mediated by carrier molecules along the concentration gradient is called Facilitated diffusion.

Diffusion occurring along the concentration gradient and mediated by carrier molecules is known as:

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