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actin activity algae ameba amino acids anaphase animal cells appear bacteria biology bivalent body cell death cell division cell doctrine CELL Figure cell membrane cell walls cellular cellulose centriole centromeres chemical chloroplast chromatids chromo chromosome number chromosomes collagen contain Courtesy of Dr cytoplasm determined diameter differentiation divide Electron micrograph electron microscope embryo energy enzymes example extracellular fertilization fibers formation function gametes genes genetic Golgi complex grana growth haploid homologues human interphase kind of cell lamella layers light microscope materials mature meiosis meiotic division membrane systems metabolic metaphase microvilli mitochondria mitosis molecular molecules muscle cells myosin nerve normal nuclear membrane nucleolus nucleotide pairs nucleus oocytes organism outer plant cells plasma membrane plastids poles prophase protein region replacement ribosomes roottip cells shape showing skin species sperm spindle stage stained STRUCTURE OF CELLS substances surface synthesis telophase tion tissue transplanted tubules vacuole zygote