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Since they are hypertonic compared with the water or soil, the root cells can take in water molecules and do not become plasmolyzed.

Good examples of halophytes are the seagrasses (see link below), red and black mangroves (Rhizophora and Avicennia), salt grass (Distichlis) and salt bush (Atriplex).

Examples of bioluminesence include dinoflagellates causing "red tide," lightning "bugs" (beetles), glow worms (beetle larvae), comb jellies (phylum Ctenophora), the deep sea angler fish, and a remarkable fungus called the jack-o-lantern thin-walled parenchyma cells of a potato tuber are filled with membrane-bound, starch-storage organelles called amyloplasts.

They are also referred to as "starch grains" in most general biology textbooks.

Since the latter solution is almost pure water, the blood cells are actually hypertonic by comparison.: Movement of water molecules from a region of high concentration to a region of lower concentration through a differentially permeable cell membrane.

In biology, this definition should include water molecules and cell membrane.: Movement of molecules or ions (charged atoms) from a region of high concentration to a region of lower concentration.

Active transport occurs during a nerve impulse or action potential (wave of depolarization) when a nerve cell membrane suddenly becomes permeable to sodium ions.

The porous, cellulose wall does not shrink because the salt ions easily pass through the wall but cannot pass through the membrane.

Since iodine stain (gram's iodine) makes starch turn purplish-black, the amyloplasts can easily be viewed with a compound microscope (400x).

Insoluble starch (amylopectin) is deposited in concentric layers within the amyloplasts.

The Elodea leaf is composed of two layers of cells.

Only one layer of cells is in focus when using the high power (40x) objective.

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