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1 Basic Structure of a Cell 1

2 Review Facts About Living Things 2

3 What Are the Main Characteristics of organisms? 1. Made of CELLS 2. Require ENERGY (food) 3. REPRODUCE (species) 4. Maintain HOMEOSTASIS 5. Universal GENETIC CODE 6. RESPOND to stimuli 7. GROW and DEVELOP 8. ADAPT and EVOLVE 3

4 LEVELS OF ORGANIZATION Nonliving Levels: 1.ATOM (element) 2.MOLECULE (compounds like carbohydrates & proteins) 3.ORGANELLES (nucleus, ER, Golgi ) 4

5 Nonliving Levels ATOMS MOLECULES ORGANELLES 5

6 LEVELS OF ORGANIZATION Living Levels: 1.CELL (makes up ALL organisms) 2.TISSUE (cells working together 3.ORGAN (heart, brain, stomach ) 4.ORGAN SYSTEMS (respiratory, circulatory ) 5.ORGANISM 6

7 Living Levels CELLS life starts here TISSUES Similar cells working together 7

8 More Living Levels ORGANS Different tissues working together ORGAN SYSTEMS Different organs working together ORGANISM 8

9 LEVELS OF ORGANIZATION Living Levels continued: 6.POPULATION (one species in an area) 7.COMMUNITY (several populations in an area) 8.ECOSYSTEM (forest, prairie ) 9.BIOME (Tundra, Tropical Rain forest ) 10.BIOSPHERE (all living and nonliving things on Earth) 9

10 History of Cells & the Cell Theory Cell Specialization 10

11 Cell Size and Types Cells, the basic units of organisms, can only be observed under microscope Three Basic types of cells include: Animal Cell Plant Cell Bacterial Cell 11

12 Number of Cells Although ALL living things are made of cells, organisms may be: Unicellular composed of one cell Multicellular- composed of many cells that may organize into tissues, etc. 12

13 CELL SIZE Typical cells range from 5 50 micrometers (microns) in diameter copyright cmassengale 13

14 Which Cell Type is Larger? Plant cell > Animal cell > bacteria 14

15 How Big is a Micron ( µ )? 1 cm = 10,000 microns 1 = 25,000 microns 15

16 Multicellular Organisms Cells in multicellular organisms often specialize (take on different shapes & functions) 16

17 Cell Specialization Cells in a multicellular organism become specialized by turning different genes on and off This is known as DIFFERENTIATION 17

18 Specialized Animal Cells Muscle cells Red blood cells Cheek cells 18

19 Specialized Plant cells Guard Cells Pollen Xylem cells 19

20 Organization Levels of Life Atoms to Organisms 20

21 Eukaryotic Cell Contain 3 basic cell structures: Nucleus Cell Membrane Cytoplasm with organelles 21

22 Two Main Types of Eukaryotic Cells Plant Cell Animal Cell 22

23 Organelles 23

24 Organelles Very small (Microscopic) Perform various functions for a cell Found in the cytoplasm May or may not be membranebound 24

25 Animal Cell Organelles Ribosome (attached) Ribosome (free) Nucleolus Nucleus Cell Membrane Nuclear envelope Mitochondrion Smooth endoplasmic reticulum Rough endoplasmic reticulum Centrioles Golgi apparatus 25

26 Plant Cell Organelles 26

27 Cell or Plasma Membrane Composed of double layer of phospholipids and proteins Surrounds outside of ALL cells Controls what enters or leaves the cell Living layer Outside of cell Proteins Carbohydrate chains Cell membrane Inside of cell (cytoplasm) Protein channel Lipid bilayer 27

28 Phospholipids Heads contain glycerol & phosphate and are hydrophilic (attract water) Tails are made of fatty acids and are hydrophobic (repel water) 28

29 The Cell Membrane is Fluid Molecules in cell membranes are constantly moving and changing 29

30 Cell Membrane in Plants Cell membrane Pushes out against the cell wall to maintain cell shape 30

31 Cell Wall Supports and protects cell Found outside of the cell membrane 31

32 Cytoplasm of a Cell cytoplasm Jelly-like substance enclosed by cell membrane Provides a medium for chemical reactions to take place 32

33 More on Cytoplasm cytoplasm Contains organelles to carry out specific jobs Found in ALL cells 33

34 The Control Organelle - Nucleus Controls activities of the cell Contains the DNA in chromosomes Bounded by a nuclear envelope (membrane) with pores 34

35 Nuclear Envelope (Nuclear Membrane) Double membrane surrounding nucleus Contains nuclear pores for materials to enter & leave nucleus Connected to the rough ER Nuclear pores 35

36 Nucleolus Inside nucleus Makes ribosomes that make proteins 36

37 Cytoskeleton Helps cell maintain cell shape Also help move organelles around Made of proteins Microfilaments are threadlike & made of ACTIN Microtubules are tubelike & made of TUBULIN 37

38 Cytoskeleton MICROTUBULES MICROFILAMENTS 38

39 Centrioles Found only in animal cells Paired structures near nucleus Made of bundle of microtubules Appear during cell division forming mitotic spindle Help to pull chromosome pairs apart to opposite ends of the cell 39

40 Centrioles & the Mitotic Spindle Made of MICROTUBULES (Tubulin) 40

41 Mitochondrion (plural = mitochondria) Powerhouse of the cell Generate cellular energy (ATP) More active cells like muscle cells have MORE mitochondria Both plants & animal cells have mitochondria Site of CELLULAR RESPIRATION (burning glucose) 41

42 MITOCHONDRIA Has its own DNA 42

43 Interesting Fact -- Mitochondria Come from cytoplasm in the EGG cell during fertilization Therefore You inherit your mitochondria from your mother! 43

44 What do mitochondria do? Power plant of the cell Burns glucose to release energy (ATP) Stores energy as ATP 44

45 Endoplasmic Reticulum - ER Network of hollow membrane tubules Connects to nuclear envelope & cell membrane Functions in Synthesis of cell products & Transport Two kinds of ER ---ROUGH & SMOOTH 45

46 Rough Endoplasmic Reticulum (Rough ER) Has ribosomes on its surface Makes membrane proteins for EXPORT out of cell 46

47 Rough Endoplasmic Reticulum (Rough ER) Proteins are made by ribosomes on ER surface They are then moved to the interior of the Rough ER to be modified and transported 47

48 Smooth ER Smooth ER lacks ribosomes on its surface Is attached to the ends of rough ER Makes membrane lipids (steroids) 48

49 Ribosomes Protein factories for cell Join amino acids to make proteins Process called protein synthesis 49

50 Ribosomes Can be attached to Rough ER OR Be free (unattached) in the cytoplasm 50

51 Golgi Bodies Stacks of flattened sacs Receive proteins made by ER Transport vesicles with modified proteins pinch off the ends CIS TRANS Transport vesicle 51

52 Golgi Bodies Look like a stack of pancakes Modify, sort, & package molecules from ER for storage OR transport out of cell 52

53 Golgi 53

54 Golgi Animation Materials are transported from Rough ER to Golgi to the cell membrane by VESICLES 54

55 Lysosomes Contain digestive enzymes Break down food, bacteria, and worn out cell parts for cells Lyse (break open) & release enzymes to break down & recycle cell parts) 55

56 Lysosome Digestion Cells take in food by phagocytosis Lysosomes digest the food & get rid of wastes 56

57 Cilia & Flagella Function in moving cells, in moving fluids, or in small particles across the cell surface 57

58 Cilia & Flagella Cilia are shorter and more numerous on cells Flagella are longer and fewer (usually 1-3) on cells 58

59 Cell Movement with Cilia & Flagella 59

60 Cilia Moving Away Dust Particles from the Lungs Respiratory System 60

61 Vacuoles Fluid filled sacks for storage Small or absent in animal cells Plant cells have a large Central Vacuole No vacuoles in bacterial cells 61

62 Vacuoles Includes storage of sugars, proteins, minerals, lipids, wastes, salts, water, and enzymes 62

63 Chloroplasts Found only in producers (organisms containing chlorophyll) Use energy from sunlight to make own food (glucose) 63

64 Chloroplasts Contains its own DNA Contains enzymes & pigments for Photosynthesis Never in animal or bacterial cells Photosynthesis food making process 64

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