Cell Cycle.

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Presentation transcript:

Cell Cycle

What is a cell’s nucleus? What is DNA? Review What is a cell? What is a cell’s nucleus? What is DNA?

Growth and division of a cell Cell Cycle Growth and division of a cell

Why do cells need to grow and divide? DNA “Overload” Diffusion

Phases of the Cell Cycle Interphase Mitosis

Interphase G1 Phase – Cells Grow S Phase – DNA replication G2 Phase – Cell prepares for division

Midlesson Review 1. Why do cells need to divide? 2. What are the two stages of the cell cycle? 3. What are the three stages of Interphase?

Do cells divide infinitely? Regulating cell cycle Do cells divide infinitely?

Regulating Cell Cycle Regulatory proteins (cyclins) Signals from other cells

Cancer Unregulated cell growth Tumors (large masses of cells) Tumors can cause damage to the body

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