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5.1 The Cell Cycle
Warm up
• Do all cells replicate? Give an explanation to your claim
5.1 The Cell Cycle
Cells have distinct phases of growth, reproduction,
and normal functions.
5.1 The Cell Cycle
The cell cycle has four main stages.
• The cell cycle is a regular pattern of growth, DNA
replication, and cell division.
5.1 The Cell Cycle
• The main stages of the cell cycle are gap 1, synthesis, gap
2, and mitosis.
– Gap 1 (G1): cell growth and
normal functions
– DNA synthesis (S): copies
– Gap 2 (G2): additional
– 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
5.1 The Cell Cycle
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).
5.1 The Cell Cycle
Cell size is limited.
• Volume increases faster than surface area.
5.1 The Cell Cycle
• Surface area must allow for adequate
exchange of materials.
– Cell growth is coordinated with
– Cells that must be large have
unique shapes.
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