1 review identify two reasons why a cell’s growth is limited explain as a cell’s size increases,...
TRANSCRIPT
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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.