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**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

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**Ch 10 Cell Growth and Division**

10.1 Cell Growth, Division, and Reproduction

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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.

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**DNA Information is used to build the molecules needed for cell growth**

The bigger the cell- the more the information is needed.

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**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.

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**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.

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**Asexual Reproduction Involves a single parent**

Produces genetically identical offspring Simple, efficient, and effective to produce many offspring Binary fission and budding.

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**Good and Bad of Asexual Reproduction**

Simple Don’t need to find a mate Quick No genetic variability.

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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.

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**Good and Bad of Sexual Reproduction**

Increased variability Generally need two individuals More complex Greater investment.

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Cell Growth and Division

Cell Growth and Division

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