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CELL SIZE

CELL SIZE. B-2 STUDENTS WILL DEMONSTRATE AN UNDERSTANDING OF THE STRUCTURE & FUNCTION OF CELLS & THEIR ORGANELLES. ESSENTIAL QUESTION. What problems does growth cause cells?. How do different cells compare in size?. HOW BIG ARE CELLS?. http://www.cellsalive.com/howbig.htm.

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CELL SIZE

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  1. CELL SIZE B-2 STUDENTS WILL DEMONSTRATE AN UNDERSTANDING OF THE STRUCTURE & FUNCTION OF CELLS & THEIR ORGANELLES

  2. ESSENTIAL QUESTION What problems does growth cause cells?

  3. How do different cells compare in size?

  4. HOW BIG ARE CELLS? • http://www.cellsalive.com/howbig.htm • http://www.biology.arizona.edu/cell_bio/tutorials/cells/cells2.html

  5. Limits to Cell Growth • larger a cell grows, the more demands the cell places on the DNA • cell has more trouble moving enough nutrients & wastes across the cell membrane

  6. Dna “overload” • amt DNA same whether cell smaller or larger whereas larger cells do have more organelles to do work of cell

  7. Exchanging materials • 1 factor that affected rate of diffusion was: Surface Area • > surface area  faster diffusion • rate that nutrients used up & waste material produced both increase as volume of cell increases

  8. Why are cells so small? As an object grows larger, its volume increases more rapidly than its surface area.

  9. Ratio of surface area/volume

  10. Cell division • b/4 a cell gets too large it goes through cell division making 2 daughter cells • each daughter cell has full compliment of chromosomes • & an increased ratio of surface area/volume

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