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Download CELL CYCLE, CELL DIVISION worksheet ANSWERS
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CELL CYCLE, CELL DIVISION worksheet ANSWERS On each line, write the term that correctly replaces the underlined words in each sentence. cell cycle cytokinesis mitosis eukaryotic binary fission stem cell centromere daughter cells prokaryotic interphase sister chromatids MITOSIS At the end of the cell cycle, the division of the cell’s nucleus occurs. CENTROMERE Until the sister chromatids in each duplicated chromosome separate during mitosis, they are held together by a protein ‘button’. CHROMATIDS A chromosome is made up of two identical coiled strands of DNA. CYTOKINESIS Following mitosis, the division of a cell’s cytoplasm occurs. CELL CYCLE Most cells go through a cyclical process of growth, development and division. PROKARYOTIC For most unicellular organisms, identified as those without a nucleus, the cell cycle might be as short as a few hours or a few days. INTERPHASE The cell cycle can be divided into two main phases – a period of growth and development and the mitotic phase. DAUGHTER CELLS Mitosis and cytokinesis result in the formation of two identical new cells. EUKARYOTIC For some cells, identified as those with membrane-bound nucleus, the cell cycle might take as long as one year. BINARY FISSION Prokaryotic cell division is asexual reproduction producing two identical daughter cells. STEM CELL A fertilized egg is a single undifferentiated cell. Name the levels of organization: cells < TISSUE < ORGANS < ORGAN SYSTEMS < organism At what stage of the cell cycle are all the cell organelles and DNA duplicated? What is the longest stage of interphase? G1 At what stage of the cell cycle are chromosomes visible? MITOSIS At what stage of the cell cycle is cell division complete? CYTOKINESIS Only prokaryotes undergo cell division. Only eukaryotes undergo mitosis. Multicellular organisms are FALSE TRUE EUKARYOTIC Unspecialized plant cells are called… MERISTEMS INTERPHASE Draw the main phases or stages of the cell cycle as pie slices, each representing the proportional time of the phase. Name the phase and describe what happens in words. Draw each phase or stage of mitosis. Name the phase and describe what happens in words. Prophase Copied DNA form into chromosomes, nuclear membrane dissolves Metaphase Chromosomes line up in middle of cell Anaphase Chromosomes separate and are pulled to opposite ends of cell Telophase New nuclear membrane forms around chromosomes, cell begins to pinch into 2 'daughter' cells
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