AP BIOLOGY

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THE CELL

TRANSPORT INTO AND OUT OF THE CELL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Reading Passage:Osmosis and diffusion are of prime importance in living organisms, where they influence the distribution of nutrients and the release of metabolic waste products. If blood cells (or other cells) are placed in contact with an isotonic solution, they will neither shrink nor swell. If the solution is hypertonic, the cells will lose water and shrink (plasmolyze). If the solution is hypotonic (or if pure solvent is used) the cells will swell; the osmotic pressure that is developed may even be great enough to rupture the cell membrane. Saltwater from the ocean is hypertonic to the cells of the human body; the drinking of ocean water dehydrates body tissues instead of quenching thirst.Question:An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes
A
water to move into the cell.
B
solutes to move out of the cell.
C
solutes to move into the cell.
D
water to move out of the cell.
Explanation: 

Detailed explanation-1: -Why is Osmosis And Diffusion Important To Living Organisms? Osmosis and diffusion are both important to living organisms because they are both processes that allow molecules to move around. Osmosis is the diffusion of water molecules, and diffusion is the diffusion of all other molecules.

Detailed explanation-2: -Diffusion is important to cells because it allows them to gain the useful substances they require to obtain energy and grow, and lets them get rid of waste products.

Detailed explanation-3: -Osmosis is the diffusion of water through a semipermeable membrane according to the concentration gradient of water across the membrane. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane and the membrane limits the diffusion of solutes in the water.

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