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Chapter 9 Section 1

Objectives: Explain why cells are relatively small. Summarize the primary stages of the cell cycle. Describe the stages of interphase . Chapter 9 Section 1. Cell Size Limitations. Most cells are smaller than a period at the end of a

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Chapter 9 Section 1

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  1. Objectives: Explain why cells are relatively small. Summarize the primary stages of the cell cycle. Describe the stages of interphase. Chapter 9 Section 1

  2. Cell Size Limitations Most cells are smaller than a period at the end of a sentence. Ratio of surface area to volume is the key factor to the limits of a cell’s size. Surface area is length x width x the number of sides. Volume is length X width X height. Transport of Substances. Small cells maintain more efficient transport systems. Cell size affects cellular communication.

  3. The Cell Cycle The cell cycle is when cells reproduce by a cycle of growing and dividing. The three main stages of the cell cycle are interphase, mitosis and cytokinesis. In interphase the cell grows, carries out cellular functions, and replicates or makes copies of its DNA. Three substages of interphase are G1, S and G2. Mitosis- the cell’s nucleus and nuclear material divide. The 4 substages of mitosis are prophase, metaphase, anaphase and telophase. Cytokinesis- The method by which a cell’s cytoplasm divides. A cell cycle can be as short as 8 minutes and as long as 1 year. Most cell cycles are between 12 to 24 hours in length. Stages of interphase: Gap1(G1) cell grows and performs normal functions. S(synthesis) DNA is replicated. Gap 2 (G2) cell prepares for mitosis.

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