Warm-Up- EOC Prep 1) What would happen to a red blood cell if salt water was added? A It would increase in size. B It would decrease in size. C Nothing would happen. D It would turn cloudy. 2) A cell is unable to control the amount of water that enters and leaves the cell. Which of the following structures is most likely defective? A Cell wall B Mitochondria C Cell membrane D Golgi Apparatus Agenda Warm-up Cell Cycle Notes WS- Cell Cycle- Holt Book Diagram of Cell Cycle Progress reports / returning papers in portfolios Clean-up Cool-down Cell Cycle The larger a cell becomes, the more demands the cell places on its DNA. In addition, the cell has more trouble moving enough nutrients and wastes across the cell membrane. As the size of cell increases, the volume increases much more rapidly than the surface area, causing the ratio of surface area to volume to decrease, which creates serious problems for the cell. If a cell got too large, it would be more difficult to get enough oxygen and other nutrients in and waste product out, which is why cells do not grow much larger if the organism of which they are a part does. Before it becomes too large, a growing cell divides forming two “daughter” cells. The process by which a cell divides into to new daughter cells is called cell division. Before cell division occurs, the cell replicates, or copies, all of its DNA. This replication allows each daughter cell to get on complete set of genetic information. The Cell Cycle is a repeating series of cellular growth and division during the life of an organism. A cell will spend 90% of its time in the first three phases of the cycle, which all together are called interphase. The last two stages of the cell cycle are for division. Five stages of the cell cycle: 1. First Growth (G1) phase-Cell grows fast 2. Synthesis (S) phase-DNA is copied 3. Second Growth (G2) phase-growth and preparation for mitosis 4. Mitosis-process during cell division that divides the nucleus of a cell into two nuclei 5. Cytokinesis-division of cytoplasm During the cell cycle, a cell grows, prepares for division, and divides to form two daughter cells, each of which then begins the cycle again. REVIEW In what phase of the cell cycle does the DNA replicate? S-synthesis phase A repeating series of growth and division is called the … Cell cycle As the size of the cell increases, the __________________ to ________________ ratio to decrease. Surface area to volume The cell spends 90% of its time in what phase… interphase Which 3 phases make up interphase? G1, S, G2 Cell Cycle Diagram Use the white paper in the box and crayons /colored pencils to create the cell cycle diagram. Include short descriptions of all 5 stages. Make sure your name is on it. This is independent work. Page 245 in the textbook. Cool-Down What ratio is important when controlling the size of the cell? 2. What are the 3 stages of interphase? 3. In what stage is DNA replicated? 1.