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=4πr 2 . The formula for finding the volume of a sphere is V=4/3r 3 . Calculate the surface area and the volume for the baseball and basketball. Then write the ratio of surface are to volume for each.
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.
Dec 15, 2015
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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
CH 10 CELL GROWTH AND DIVISION
10.1 Cell Growth, Division, and Reproduction
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.
DNA
Information is used to build the molecules needed for cell growth
The bigger the cell- the more the information is needed.
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.
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.
Asexual Reproduction
Involves a single parent Produces genetically identical offspring Simple, efficient, and effective to
produce many offspring Binary fission and budding.
Good and Bad of Asexual Reproduction Simple Don’t need to find
a mate Quick
No genetic variability.
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.
Good and Bad of Sexual Reproduction Increased
variability
Generally need two individuals
More complex Greater
investment.
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