The cell cycle is a regular pattern of growth, DNA replication, and cell division.

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Presentation transcript:

KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.

The cell cycle is a regular pattern of growth, DNA replication, and cell division.

The main stages of the cell cycle are Interphase and mitosis. Interphase is broken into three stages: Gap 1 (G1): cell growth and normal functions DNA synthesis (S): copies DNA Gap 2 (G2): additional growth Mitosis (M): includes division of the cell nucleus (mitosis) and division of the cell cytoplasm (cytokinesis) Mitosis occurs only if the cell is large enough and the DNA undamaged.

Cells divide at different rates. The rate of cell division varies with the need for those types of cells. Some cells are unlikely to divide (G0).

Cell size is limited. Volume increases faster than surface area.

Cell size is limited. Volume increases faster than surface area.

Surface area must allow for adequate exchange of materials Surface area must allow for adequate exchange of materials. If the cell is too large (surface area to volume ratio) then it can’t get enough nutrients in and enough wastes out and it will die. The cell will not die… it will divide – mitosis. If cells must be large then they have unique shapes.