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Bio1130 Proterozoic eon - Alternation of generations...

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Alternation of generations – occurrence of altering haploid and diploid multicellular forms within the life cycle of an organism Ameboid (Amoeboid) movement – mode of cell locomotion that depends on pseudopodia and involves cycles of gelation and solation of the actin cytoskeleton Antibody – class of proteins produced by lymphocytes that bind with extraordinary specificity to substances, referred to as antigens, that provoke an immune response Asexual reproduction – form of reproduction in which a single parent is the only contributor of genetic information to the new organism Capsid protein – the protective layer of protein that surrounds the nucleic acid core of a virus in free form Chloroplast – double membrane-enclosed cytoplasmic organelle of plants and algae that contains chlorophyll and the enzymes needed to carry out photosynthesis Cilia – motile structure, extending from a cell surface, that moves a cell through fluid or fluid over a cell *Contractile vacuole – a specialized cytoplasmic organelle that pumps fluid in a cyclical manner from within the cell to the outside by alternately filling and then contracting to release its contents at various points on the surface of the cell Diploid – containing two sets of chromosomes and therefore two copies of each gene; can describe a cell, nucleus, or organism composed of such cells
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