Last Modified: 2016-03-08
-Smaller than the smallest cell
-Measured in nanometers
-Non living structure
-Have a nucleic acid core containing DNA or RNA
-Subdivided into three groups:
-Methanogens, Themoacidophiles, halophiles
-Several microscopic marine algae are notoriously poisonous to hapless humans who consume them in shellfish
-Some species are poisonous to animals which feed upon them directly or indirectly
-Some of the toxins these species produce are seriously toxic. Often, the algae themselves are unaffected, as are the filter feeders, especially shellfish, for whom micro-algae are the pricipal diet. However, to carnivores, including humas, the toxins are potentially fetal.
-Have cellulose cell walls and store food as the carbohydrates starch
-used to make of variety of products
-make female megaspores, and male microspores
-Are the inner whorl of leaf-like bracts
-Form when ovary with ovules ripens
-May be dry and hardened
-May be enlarged and fleshy
-Used to help disperse seeds
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