1. 1 Review Identify two reasons why a cell’s growth is limited
Explain As a cell’s size increases, what happens to the ration of its surface area to volume ratio
Applying Concepts Why is a cell’s surface to volume ratio important
2 Visual Thinking The formula for finding the surface of area of a sphere is A=4πr2. The formula for finding the volume of a sphere is V=4/3r3.
Calculate the surface area
and the volume for the baseball
and basketball. Then write the
ratio of surface are to volume for each.
Baseball r = 3.6 cm Basketball r = 12.2 cm

2. Ch 10 Cell Growth and Division
10.1 Cell Growth, Division, and Reproduction

3. Limits to Cell Size
The larger a cell becomes, the more demands the cell places on its DNA.
The larger a cell grows the less efficient in moving nutrients and waste materials across its cell membrane.

4. DNA Information is used to build the molecules needed for cell growth
The bigger the cell- the more the information is needed.

5. Exchanging Materials Nutrients and wastes pass through cell membrane
The greater surface area the more materials that can pass
Key is surface area to volume.

6. Cell Division The splitting of a larger cell into two “daughter” cells
Cell makes a second copy of its DNA
Reduces cell volume so it increases surface area to volume ratio.

7. Asexual Reproduction Involves a single parent
Produces genetically identical offspring
Simple, efficient, and effective to produce many offspring
Binary fission and budding.

8. Good and Bad of Asexual Reproduction
Simple
Don’t need to find a mate
Quick
No genetic variability.

9. Sexual Reproduction
Offspring are produced by the fusion of two sex cells one from each of two parents
Offspring are genetically different
Most animals and plants, and many single-celled organisms.

10. Good and Bad of Sexual Reproduction
Increased variability
Generally need two individuals
More complex
Greater investment.