The student is expected to: 5A describe the stages of the cell cycle, including deoxyribonucleic acid (DNA) replication and mitosis, and the importance.

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Presentation transcript:

The student is expected to: 5A describe the stages of the cell cycle, including deoxyribonucleic acid (DNA) replication and mitosis, and the importance of the cell cycle to the growth of organisms

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

The cell cycle has four main stages. The cell cycle is a regular pattern of growth, DNA replication, and cell division.

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.

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.

Surface area must allow for adequate exchange of materials. Cell growth is coordinated with division. Cells that must be large have unique shapes.