Florida Biology EOC Practice Test

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What is an example of passive transport?

Facilitated diffusion
Protein synthesis
Vesicle formation
Active transport

The correct answer is: Facilitated diffusion

An example of passive transport is the movement of molecules across a cell membrane without the input of energy. This process is driven by concentration gradients and does not require the aid of transport proteins, unlike facilitated diffusion (A). Protein synthesis (B) and vesicle formation (C) both involve active processes that require energy to occur. Active transport (D) also requires energy expenditure and involves the movement of molecules against their concentration gradient. Therefore, A is the only option that accurately represents passive transport.