Question

multiple - choice question
a white blood cell surrounds and swallows a harmful bacterium to protect the body. the cell uses energy to pull the bacterium inside.
this process is an example of:
passive transport, because the bacterium moves into the cell naturally
active transport (endocytosis), because energy is used to bring the bacterium in
osmosis, because water helps carry the bacterium inside
diffusion, because the bacterium spreads across the membrane

Explanation:

Active transport requires energy. Endocytosis is a form of active - transport where cells engulf substances like bacteria. Since the white blood cell uses energy to pull the bacterium in, it is endocytosis. Passive transport doesn't use energy, osmosis is the movement of water, and diffusion is the passive movement of substances across a membrane.

Answer:

B. Active transport (endocytosis), because energy is used to bring the bacterium in