Bio ch05 1
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The cell cycle has four main stages - G1, S, G2, and M. G1 is a growth phase where the cell grows and carries out normal functions. S phase is where DNA replication occurs and copies the cell's DNA. G2 is another growth phase to prepare for division. Mitosis (M phase) is where the cell nucleus and cytoplasm divide to form two daughter cells. The rate of cell division varies depending on the needs for that type of cell. Cell growth is coordinated with cell division so cells do not exceed a size limit for adequate material exchange.
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Bio ch05 1
- 1. 5.1 The Cell Cycle KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.
- 2. 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.
- 3. 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 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.
- 4. 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. 5.1 The Cell Cycle Cell size is limited. • Volume increases faster than surface area.
- 6. 5.1 The Cell Cycle • Surface area must allow for adequate exchange of materials. – Cell growth is coordinated with division. – Cells that must be large have unique shapes.