Would it be ok if cells continued to grow forever? Explain OBJECTIVES: What does the cell do in order to solve the dilemma of growing forever What are the stages of the cell cycle DUE AT THE END OF CLASS: Cell Size Lab from yesterday HOMEWORK: Read section 9.1 and complete assessment questions on p. 247

Cells are limited in how large they can be. This is because the surface area to volume ratio does not stay the same as their size increases. Because of this, it is harder for a large cell to pass materials in and out of the membrane, and to move materials through the cell.

 Surface area-  Volume-

 Transport of substances  Cellular communications

Once a cell reaches its size limit, something must happen- either is will stop growing or it will divide. Most cells will eventually divide. Cell division not only prevents the cell from becoming too large, but it also is the way cell reproduces so that you grow and heal certain injuries.

Would it be ok if cells continued to grow forever? Explain OBJECTIVES: What does the cell do in order to solve the dilemma of growing forever What are the stages of the cell cycle DUE AT THE END OF CLASS: Cell Size Lab from yesterday HOMEWORK: Read section 9.1 and complete assessment questions on p. 247

Each time a cell goes through one complete cycle, it becomes two cells. When the cycle is repeated continuously, the result is a continuous production of new cells. 3 Main Stages: Interphase Mitosis Cytokinesis

During interphase, the cell grows, develops into a mature functioning cell, duplicates its DNA, and prepares for division.  G 1 - Cell is growing  S- Synthesis Cell copies its DNA in preparation for cell division.  G 2 - Cell prepares for division of nucleus (mitosis)

Prophase Metaphase Anaphase Telophase

Process of dividing the cytoplasm