Your Objective Targets Objective 5 A Describe the

Your Objective Targets Objective • 5 A 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 1 - Explain the importance of the cell cycle for organisms. 2 - Describe interphase and the G 0 phase in the cell cycle. 3 - Identify and describe the four main stages of the cell cycle. 4 Describe the events that occur in each phase of the cell cycle 5 - Describe cytokinesis in the cell cycle.

5. 1 The Cell Cycle What will you be doing today? ? ? • Review Aerobic vs Anaerobic Respiration #33 b • Cell Cycle Notes #34 • Cell cycle Diagram FRONT & BACK- Due Today • Cell Cycle Study Guide – DUE TODAY TEKS 5 A

5. 1 The Cell Cycle Review respiration by completing Venn Diagram TEKS 5 A

What happens to a human when he or she reaches the ages of about 1624 years of age? ? ? He or She stops growing

Same thing happens to a cell…but why? ? ? • Watch this video and be able to explain why the cell size has limits. If the volume get too large, reactions will not be able to take place

5. 1 The Cell Cycle TEKS 5 A KEY CONCEPT 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. TEKS 5 A

5. 1 The Cell Cycle TEKS 5 A • The main stages of the cell cycle are gap 1, synthesis, gap 2, and mitosis. – Gap 1 (G 1): cell growth and normal functions – DNA synthesis (S): copies DNA – Gap 2 (G 2): 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.

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 (G 0). TEKS 5 A

5. 1 The Cell Cycle Cell size is limited. • Volume increases faster than surface area. TEKS 5 A

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. TEKS 5 A