Multicellular Organisms Must Keep Their Cells Awash in an "Internal

question 37

Multiple Choice

Multicellular organisms must keep their cells awash in an "internal pond" because

• A)feedback signals cannot cross through the interstitial fluid.
• B)cells need an aqueous medium for the exchange of nutrients, gases, and wastes.
• C)this prevents the movement of water due to osmosis.
• D)cells need to be protected from nitrogen gas in the atmosphere.
• E)terrestrial organisms have not adapted to life in dry environments.

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Definitions:

Central Vacuole

A large vacuole found in the center of most plant cells, involved in storage and the regulation of cell volume and pressure.

Plasmolysis

The process in which cells lose water in a hypertonic solution, causing the cell membrane to detach from the cell wall.

Crenation

The shrinking of cells in a hypertonic solution due to loss of water through osmosis.

Osmotic Pressure

The pressure that needs to be applied to a solution to prevent the inward flow of water across a semipermeable membrane.