DP Biology 1.2 Ultrastructure of Cells

1. 1.2 Ultrastructure of Cells
DP Biology
R. Price
v. 1 2015

2. Allott 16

3. #1 Prokaryotes have a simple cell structure without compartments
• Prokaryotes do not have a
nucleus
• Cell membrane present
• Cell wall has peptidoglycan
• 70S ribosomes
• Area of cytoplasm that looks
lighter = nucleoid (DNA, but not
nucleus)
Allott 19

4. Allott 19

5. Allott 20

6. #2 Eukaryotes have a compartmentalized cell structure
• Eukaryotes have a nucleus
• Eukaryotes have organelles
• Organelles have specialized
functions
Allott 23

7. Allott 21

8. Allott 21

9. Allott 22

10. Allott 22

11. Allott 22

12. Allott 23

13. Allott 23

14. Allott 23

15. Allott 24

16. Allott 25

17. #3 Prokaryotes divide by binary fission
• Asexual reproduction
• Single circular chromosome
replicates
• A copy moves to each end of the
cell
• Cell divides

18. #4 Electron microscopes have a much higher resolution than light
microscopes
Max light microscope resolution .2µm
Red and white blood cells
Max electron microscope resolution .001µm
Red and white blood cells

19. Sources
Content
Allott, Andrew, and David Mindorff. Biology: Course Companion. 2014
ed. Oxford: Oxford UP, 2014. Print. Oxford IB Diploma Programme.
Walpole, Brenda. Biology for the IB Diploma. 2nd ed. Cambridge:
Cambridge UP, 2014. Print.
Images
Unless otherwise noted, images are obtained from Pixabay
(www.pixabay.com) and used under the CC0 Public Domain license.