Presentation on theme: "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."— Presentation transcript:
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=4 π r 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. 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.