10-1

1. Two reasons cells divide are (1) the larger the cell becomes, the more demands the cell places on its DNA and (2) the more trouble the cell has moving enough nutrients and wastes across the cell membrane.

2. A cells DNA is like the books in a library because it stays the same. In a a growing town, the library doesn't grow with it, it stays the same just like DNA in a cell--the DNA doesn't grow with the cell.

3. Cell division is the solution to the problems caused by cell growth.

4. As a cell increased in size, the cell's volume increases more rapidly than its surface area.

5. Surface Area: 96cm2 Volume: 64cm3; 96:64= 3:2