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Protects the nucleus and breaks down during prophase – Nuclear membrane Unspecified cells that are able to develop into many different cell types – Stem Cells Groups of similar types of cells that work together to perform a particular job – Tissues A cell without a membrane-bound nucleus – Prokaryote The basic unit of structure and function - Cells A cell with a membrane-bound nucleus - Eukaryote Groups of different organs that work together to complete a series of tasks – Organ System An individual form of life that has the ability to function independently (ie. - plant, animal, bacteria) – Organism The process by which cells become different types of cells – Cell Differentiation Long, thin strands of DNA – Chromatin Made up of only one cell – Unicellular Made up of two or more cells – Multicellular All cells in a multicellular organism come from this one cell – Fertilized Egg/Zygote The cycle of growth, development, and division that most organisms go through – Cell Cycle The stage where the cell grows, replicates its DNA, and prepares to divide – Interphase Groups of different tissues working together to perform a particular job – Organs The structure that sister chromatids are held together by – Centromere The 2 new cells that result from mitosis and cytokinesis – Daughter cells The stage where the nucleus and its contents divide – Mitosis The stage where the cytoplasm and its contents divide – Cytokinesis Tightly coiled DNA (rod shaped) – Chromatid Phase where sister chromatids separate and cell elongates – Anaphase Phase where DNA condenses into chromosomes & the nuclear membrane breaks down - Prophase Phase where the chromosomes line up in the center of the cell – Metaphase Phase where 2 identical nuclei form – Telophase A pair of sister chromatids – Duplicated Chromosomes These “little organs” are found inside the cell – Organelles A type of reproduction involving one parent organism – Asexual Reproduction These help in cell division and move to opposite ends of the cell during prophase – Centrioles These attach to the chromosomes and pull them apart during anaphase - Spindle Fibers The original cell that is the source of other cells – Parent Cell The genetic material found inside the nucleus DNA