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.co m/howbig.htm http://www.biology.arizo na.edu/cell_bio/tutorials /cells/cells2.html

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

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

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

Ratio of surface area/volume

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