Chapter 26 - sperm and egg cells, rather than by binary...

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Chapter 26: Protists Members of the kingdom protoctista Results of the varies early branching of eukaryotic evolution. Most varied of all Earth’s creatures. Single-celled and large multicellular organisms Predators, photosynthesizers, parasites, or decomposers So diverse, it’s difficult to classify their status as a kingdom. Protists are most easily classified by what they are not o NOT prokaryotes, fungi, plants, or animals o Eukaryotes. o Protists vs. Prokaryotes o Unlike prokaryotes, protists have a true nucleus with multiple, linear chromosomes o In addition to cytoplasmic organelles, protists and other eukaryotes have microtubules and microfilaments which provide motility and cytoskeletal support. o They reproduce asexually by mitosis or sexually by meiosis and union of
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Unformatted text preview: sperm and egg cells, rather than by binary fission as do prokaryotes. o Protists vs. Eukaryotes o Cell wall components in protists differ from those of the fungi o Protists lack highly differentiated structures equivalent to true roots, stems, and leaves; they also lack the protective structures that encase developing embryos in plants. –from land plants o Lack of highly differentiated structures such as limbs and a heart, and by the absence of features such as nerve cells, complex developmental stages, and an internal digestive tract.—from animals Lack collagen, the characteristic extracellular support protein of animals. •...
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This note was uploaded on 03/31/2009 for the course LIFESCI Life scien taught by Professor Lorenz,t.c. during the Spring '09 term at UCLA.

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