Mitosis160-page5 - • DNA Duplication(S • DNA...

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Cell Reproduction: Mitosis - 5 The Cell Cycle Mitosis is a part of the cell cycle. The cell cycle starts when a cell is formed and continues until it divides (or dies). Some cells never divide; others are specialized for division (especially in plants, where virtually all cell division occurs in specialized tissue called meristem). Cell division is a brief part of the life cycle; most of the life of a cell is spent in normal activities of growth and maintenance. The cell cycle involves the following: Interphase Interphase is the period of time for normal cell activities, including: Growth (G 1 or Gap) The newly formed cell does its normal activities.
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Unformatted text preview: • DNA Duplication (S) • DNA duplication (or synthesis) occurs. • Once started, DNA duplication cannot be reversed; the cell is committed to divide. • Preparation for Division (G 2 ) • Proteins needed to do cell division are manufactured in preparation for mitosis and cytokinesis. • Cells can continue to grow and do their normal cell activities as well. • A G 2 checkpoint controls whether or not the cell will go into mitosis. Note: If a cell never divides, it stays in G 1 “permanently” a state called G (or non-dividing state)....
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