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Bio ch 32 terms.docx 2

Bio ch 32 terms.docx 2 - component of cell walls...

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development in animals. Cambrian explosion A relatively brief time in geologic history when large, hard-bodied forms of animals with most of the major body plans known today appeared in the fossil record. This burst of evolutionary change occurred about 535–525 million years ago. cell wall A protective layer external to the plasma membrane in the cells of plants, prokaryotes, fungi, and some protists. Polysaccharides such as cellulose (in plants and some protists), chitin (in fungi), and peptidoglycan (in bacteria) are an important structural
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Unformatted text preview: component of cell walls. Cephalization (sef´-uh-luh-za´-shun) An evolutionary trend toward the concentration of sensory equipment at the anterior end of the body. Chordate Member of the phylum Chordata, animals that at some point during their development have a notochord; a dorsal, hollow nerve cord; pharyngeal slits or clefts; and a muscular, post-anal tail. Cleavage (1) The process of cytokinesis in animal cells, characterized by pinching of the plasma membrane. (2)...
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