2. 1 Basic Structure of a Cell

3. Robert Hooke describes the first cells in 1665. Antony Van Leeuwenhoek discovered the first protozoa in 1674. He saw bacteria 9 years later.

4. In 1838 Theodor Schwann came up with the Cell Theory which states: 1. All organisms are made up of 1 or more cells. 2. The cell is the basic unit of all living things. 3. Only living cells can produce new living cells.

5. 4 Introduction to Cells Cells are the basic units of organisms Cells can only be observed under microscope Basic types of cells: Animal CellPlant Cell Bacterial Cell

6. 5 Number of Cells Organisms may be: Unicellular – composed of one cell Multicellular- composed of many cells that may organize

7. 6  Prokaryotes include bacteria & lack a nucleus or membrane-bound structures called organelles  Eukaryotes include most other cells & have a nucleus and membrane- bound organelles Cells May be Prokaryotic or Eukaryotic

8. 7 Prokaryotes Nucleoid region contains the DNA Cell membrane & cell wall Contain ribosomes (no membrane) to make proteins in their cytoplasm

9. 8 Eukaryotic Cell Contain 3 basic cell structures: Nucleus Cell Membrane Cytoplasm with organelles

10. 9 Two Main Types of Eukaryotic Cells Plant Cell Animal Cell

11. 10 Organelles Very small size Can only be observed under a microscope Have specific functions Found throughout cytoplasm

12. 11 Organelles Found in Cells Examples of Organelles include: Endoplasmic reticulum (rough & smooth) – canals for movement Golgi Bodies – wrap & export proteins Nucleolus – makes ribosomes Lysosomes – digests & gets rid of wastes Ribosomes – makes proteins

13. 12 Golgi Bodies

14. 13 Lysosome

15. 14 Nucleolus

16. 15 Smooth & Rough Endoplasmic Reticulum Smooth ER lacks ribosomes & makes proteins USED In the cell Rough ER has ribosomes on its surface & makes proteins to EXPORT

17. 16 Contain the green pigment chlorophyll Traps sunlight to make to make sugars (food) Process called photosynthesis Plant Cell Organelles Chloroplast

18. 17 Dead layer Large empty spaces present between cellulose fibers Freely permeable Cell wall Plant Cell

19. 18 Plant Cell Made of cellulose which forms very thin fibers Strong and rigid Found in plant cells Cell wall

20. 19 Protect and support the enclosed substances (protoplasm) Resist entry of excess water into the cell Give shape to the cell Cell wall Plant Cell

21. 20 Rod shape Site of Cellular respiration Plant Cell Organelles Mitochondrion ( mitochondria )

22. 21 Active cells like muscles have more mitochondria Burn sugars to produce energy ATP Plant Cell Organelles Mitochondria

23. 22 Lies immediately against the cell wall Made of protein and phospholipids Selectively permeable Cell membrane Plant Cell

24. 23 Living layer Controls the movement of materials into and out of the cell Cell membrane Plant Cell

25. 24 Jelly-like substance enclosed by cell membrane Provides a medium for chemical reactions to take place Cytoplasm Plant Cell

26. 25 Contains organelles to carry out specific jobs Examples: chloroplast & mitochondrion Cytoplasm Plant Cell

27. 26 Have a large central vacuole Surrounded by tonoplast Contains cell sap Sugars, proteins, minerals, wastes, & pigments Plant Cell Organelles Vacuole

28. 27 Controls the normal activities of the cell Bounded by a nuclear membrane Contains chromosomes Plant Cell Organelle Nucleus

29. 28 Each cell has fixed number of chromosomes that carry genes Genes control cell characteristics Nucleus Plant Cell

30. 29 mitochondrion nucleus glycogen granule cell membrane cytoplasm Animal cell No cell wall or chloroplast Stores glycogen in the cytoplasm for food energy vacuole

31. 30 Active cells like muscles have more mitochondria Burn sugars to produce energy ATP Animal Cell Organelles Mitochondria

32. 31 Animal Cell Organelles Near the nucleus Paired structures Help cell divide

33. 32 Similarities between plant cells and animal cells Both have a cell membrane surrounding the cytoplasm Both have a nucleus Both contain mitochondria

34. 33 Differences between plant cells and animal cells Animal cellsPlant cells Relatively smaller in size Irregular shape No cell wall Relatively larger in size Regular shape Cell wall present

35. 34 Animal cellsPlant cells Vacuole small or absent Glycogen as food storage Nucleus at the center Large central vacuole Starch as food storage Nucleus near cell wall Differences between Plant Cells and Animal Cells

36. 35 Compound Microscope Instrument for observing small objects Magnify images up to 2000X their size

37. 36 Different parts of a microscope

38. 37 Eyepiece Fine adjustment Arm Stage Condenser control knob Base Body tube Coarse adjustment Iris diaphragm Revolving nosepiece Objective Clip Condenser Mirror

39. 38 Levels of organization Cells are grouped together and work as a whole to perform special functions

40. 39 Tissue A group of similar cells to perform a particular function –Animals : epithelial tissue, muscular tissue –Plants : vascular tissue, mesophyll

41. 40 Organ Different tissues group together to carry out specialized functions –Heart : consists of muscles, nervous tissue and blood vessels –Leaf : consists of epidermis, mesophyll and vascular tissue

42. 41 System Several organs and tissues work together to carry out a particular set of functions in a co-ordinated way –Human : digestive, respiratory, excretory, circulatory and reproductive systems –Plant : root and shoot systems

43. 42 It’s You!