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Exoskeletons An exoskeleton is a hard encasement deposited on the surface of
an animal. For example, most molluscs are enclosed in a calcareous (calcium
carbonate) shell secreted by the mantle, a sheetlike extension of the body.
Where protectior is most important, the cuticle 's hardened with organic
compounds that cross-l'nk the proteins of the exoskeleton. Some crustacears,
such as lobsters, harden portions of their exoskeleton even more by adding
calcium salts. ln ...
... inhibits horizontal cel s. e. converts cG'i/lP to GMP, opening sodium channes
and hyperpolarizing tr membrane, causing tr rhodopsin to becorr bleached.
Clams and lobsters both have an exoskeleton, but lobsters have much greater
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