1. Cell Growth And Division
Chapter 10
Cell Growth And Division

2. I. Cell Growth 1) larger a cell grows,the more demands on its _______
DNA
A. Limits to Cell Growth
2 reasons cells divide rather than continuing to grow indefinitely:
1) larger a cell grows,the more demands on its _______
will not be making enough copies of DNA as size increases---This would cause an information crisis.
2) difficult to move waste and nutrients across cell
which waste products leave cell depends on _______________________ of cell=total area of cell membrane
Surface area

3. rate @ which food and Oxygen are used up and waste produced depends on _____________________
RATIO OF SURFACE AREA TO VOLUME-assuming a cube shape,surface area=l x w x 6…..volume= lx w x h… ratio = SA /volume
Cell volume

4. Ratio of Surface Area to Volume in Cells
Section 10-1
Cell Size
Surface Area (length x width x 6)
Volume
(length x width x height)
Ratio of Surface Area to Volume

5. Volume increases faster than surface area/CAUSING RATIO TO __________________..causing serious problems for cell
decrease

6. B. Division of Cell
-A cell divides into 2 daughter cells =_______________________________
This happens before a cell can get too large
DNA ___________________before cell division,solving info crisis.
Cell division
replicates

7. II. Cell Division ***simpler in prokaryotes
A. chromosomes –carries genetic info in eukaryotes
made up of ____________ and proteins
cells of every organism have a specific # of Chromosomes
humans have___ Chromosomes
fruit flies have 8
usually not visible except in cell division,when they condense
___________________before cell division 46
Replicates or copies
DNA

8. chromatids attached @__________________,usually near middle
each Chromosome consists of 2 identical __________________,which separate from each other in cell division
chromatids near middle
chromatids
centromere

9. B. Cell Cycle ________________________is in- between phase
______________________is the series of events that a cell goes through during growth and division….Where the cell grows,prepare for division,divides into 2 daughter cells
interphase
Cell Cycle

10. M= _______________________________ S= ________________________________
4 phases
M= _______________________________
S= ________________________________
G1 and G2= ________________________________________________________
Mitosis and cytokinesis
Chromsomes replicate & DNA synthesis,some proteins synthesize
G1=cell growth/G2= organelles and molecules produced

11. Figure 10–4 The Cell Cycle G1 phase M phase S phase G2 phase
Section 10-2
G1 phase
M phase
S phase
G2 phase

12. ANAPHASE

13. 1) Prophase Longest phase centrioles Chromosomes become visible
_______________________,2 tiny structures near nuclear envelope-separate and take positions on opposite ends of nucleus
Centrosome region helps organize __________________-microtubules that help separate chromosomes
Chromosomes attach to __________________________
@ end chromosomes coil tightly and nuclear envelope disappears
centrioles
Spindle fibers
spindle

14. 2) Metaphase- 3) Anaphase- chromosomes line up @ center
Centromeres go to 2 poles
3) Anaphase-
Centromeres split
Chromatids separate and become individual _____________________
New chromosomes go to opposite poles and then stop moving
chromosomes

15. 4) Telophase-
Chromosomes disperse into tangle of material
New nuclear envelopes
Spindle breaks apart
Nucleolus becomes visible

16. D. Cytokinesis-divison of cytoplasm
Usually along w/ Telophase
Cell plate forms in plants that becomes the ______________________________
CELL WALL

17. III.
_____________________= disorder in which some of the body’s cells lose the ability to regulate growth
They do not respond to signals that regulate growth
Divide uncontrollably,making ___________________(masses of cells)
_____________=protein that regulates normal cell cycle (in eukaryotes)
tumors
cancer
cyclins

18. Click a hyperlink to choose a video. Animal Cell Mitosis
Videos
Click a hyperlink to choose a video.
Animal Cell Mitosis
Animal Cell Cytokinesis
Video Contents

19. Click the image to play the video segment.
Animal Cell Mitosis
Click the image to play the video segment.
Video 1

20. Click the image to play the video segment.
Animal Cell Cytokinesis
Click the image to play the video segment.
Video 2