1. Slide 1 of 14 Copyright Pearson Prentice Hall Biology

2. Slide 2 of 14 Copyright Pearson Prentice Hall 10–1 Cell Growth CLE 3210.1.4: Describe the processes of cell growth and reproduction. SPI 3210.1.6: Determine the relationship between cell growth and reproduction. CFU 3210.1.6: Demonstrate the movement of chromosomes during mitosis in plant/animal cells.

3. Slide 3 of 14 --Cell size = growth = cell division **Why doesn’t a cell grow forever?? Limits and demands! (in engineering speak---constraints!!!) 1. Lg cell, more demands on DNA eventually it can’t keep up. (limit) 2. Lg cell makes it harder to move food/waste in and out of cell (demand) Copyright Pearson Prentice Hall 10–1 Cell Growth

4. Slide 4 of 14 Copyright Pearson Prentice Hall Limits to Cell Growth The rates that food, oxygen, water, and wastes are moved is dependent on the surface area of the cell. The rate at which food, oxygen, and water are used and waste is produced depends on the cell’s volume. Ratio of S. Area to Volume SA = l x w x #sides V = l x w x h

5. 10–1 Cell Growth Slide 5 of 14 Copyright Pearson Prentice Hall Limits to Cell Growth— imagine a cube shaped cell… 1x1x6 =6 1X1X1=1 RATIO IS 6:1 3X3X6=54 3X3X3=9 RATIO IS 54:24 OR 2:1

6. 10–1 Cell Growth Slide 6 of 14 SO…6:1 VS 2:1 Volume increases faster than SA and the ratio goes down…. Problem: pathways of travel get longer, but ways to get “stuff” out do not get larger. Takes more time, and cell suffers for the delay. Imagine…main street…town grows, but street stays 2 lane!!! Copyright Pearson Prentice Hall

7. 10–1 Cell Growth Slide 7 of 14 Copyright Pearson Prentice Hall Ratio of Surface Area to Volume As the length of a cell increases, its volume increases faster than the surface area. The decrease in the cell’s ratio of surface area to volume makes it more difficult for the cell to move needed materials in and waste products out quickly enough for the cell to survive.

8. 10–1 Cell Growth Slide 8 of 14 Copyright Pearson Prentice Hall Division of the Cell Before it becomes too large, a growing cell divides forming two “daughter” cells. The process by which a cell divides into two new daughter cells is called cell division.

9. - or - Continue to: Click to Launch: Slide 9 of 14 Copyright Pearson Prentice Hall 10–1

10. Slide 10 of 14 Copyright Pearson Prentice Hall 10–1 As a cell increases in size, which of the following increases most rapidly? a.surface area b.volume

11. Slide 11 of 14 Copyright Pearson Prentice Hall 10–1 If an imaginary cube-shaped cell has a length of 6 cm, its ratio of surface area to volume is a.1 : 1. b.6 : 1. c.36 : 1. d.1 : 6.

12. Slide 12 of 14 Copyright Pearson Prentice Hall 10–1 The process by which a cell divides into two new daughter cells is called a.cell growth. b.cell division. c.DNA replication. d.cell multiplication.

13. Slide 13 of 14 Copyright Pearson Prentice Hall 10–1 When one cell divides in two, what happens to the surface area to volume ratios in the new cells? a.There is no change in the amount of material exchanged. b.Each new cell can exchange more material than the original cell. c.Each new cell can exchange less material than the original cell. d.The two new cells cannot be compared to the original cell.

14. Slide 14 of 14 Copyright Pearson Prentice Hall 10–1 When a growing cell undergoes cell division, each new cell gets a.half the DNA from the original cell. b.twice as much DNA as the original cell. c.a random sample of the DNA in the original cell. d.a full copy of all the DNA in the original cell.

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