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Multiple Choice
Which of the following is an example of passive transport in cells?
A
Active transport
B
Endocytosis
C
Exocytosis
D
Diffusion
Verified step by step guidance
1
Understand the concept of passive transport: Passive transport is the movement of substances across cell membranes without the need for energy input from the cell. It relies on the concentration gradient, moving substances from areas of higher concentration to areas of lower concentration.
Identify the types of passive transport: The main types of passive transport include diffusion, osmosis, and facilitated diffusion. These processes do not require cellular energy (ATP) and occur naturally due to the concentration gradient.
Examine the options provided: Active transport, endocytosis, and exocytosis are processes that require energy input from the cell, typically in the form of ATP, to move substances against their concentration gradient or to transport large molecules.
Focus on diffusion: Diffusion is a type of passive transport where molecules move from an area of higher concentration to an area of lower concentration until equilibrium is reached. It is a spontaneous process that does not require energy.
Conclude with the correct example: Based on the definitions and characteristics of passive transport, diffusion is the correct example of passive transport among the options provided.