AP BIOLOGY

LABORATORY REVIEW

DIFFUSION AND OSMOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When does the cell form a vesicle?
A
active transport
B
diffusion
C
passive transport
D
osmosis
Explanation: 

Detailed explanation-1: -Vesicle transport requires energy, so it is also a form of active transport. There are two types of vesicle transport: endocytosis and exocytosis.

Detailed explanation-2: -Endocytosis. Endocytosis (endo = internal, cytosis = transport mechanism) is a general term for the various types of active transport that move particles into a cell by enclosing them in a vesicle made out of plasma membrane.

Detailed explanation-3: -A vesicle forms when the membrane bulges out and pinches off. It travels to its destination then merges with another membrane to release its cargo. In this way proteins and other large molecules are transported without ever having to cross a membrane.

Detailed explanation-4: -Vesicles switch stochastically between active and passive transport states.

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