-A non-cellular particle made up of genetic materials and protein that can invade living cells -Smaller than the smallest cell -Measured in nanometers -Non living structure -Noncellular -Contain capsid -Have a nucleic acid core containing DNA or RNA
Prokaryotes living in extreme habitats -Subdivided into three groups: -Methanogens, Themoacidophiles, halophiles
-Stain pink or reddish
-Caused by dinoflagellates -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.
-Multicellular -Mostly marine -Have cellulose cell walls and store food as the carbohydrates starch -perform photosynthesis -used to make of variety of products
used as a culture medium and a thickening agent in puddings, ice cream
make 2 types of spores -make female megaspores, and male microspores
Usually colored -Are the inner whorl of leaf-like bracts
-Angiospores -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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