1. -nucleolus -cytoskeleton -cell membrane -vacuole
The Organelles
-nucleus cytoplasm
-nucleolus cytoskeleton
-cell membrane vacuole
-mitochondria chloroplast
-golgi Apparatus centrioles
-lysosomes ribosomes
-endoplasmic reticulum(ER)
*Rough ER & Smooth ER 1

3. Example: like a big plastic bag with tiny holes in it
CELL MEMBRANE
holds the cell together
keeps all of the pieces (like the organelles and the cytoplasm) inside the cell
controls what goes in and out of the cell
Example: like a big plastic bag with tiny holes in it 3

4. How does the cell membrane work?
Has 2 layers of MOLECULES = BILAYER
Bi means two
The layers are made up of molecules called phospholipids
**THINK OF a sandwich with two pieces of bread and some stuffing on the inside 4

5. Cell Membrane: PHOSPHOLIPIDS
Each phospholipids has a HYDROPHOBIC and HYDROPHILIC end
HYDRO = means water
PHOBIC = means afraid
PHILIC = means loving 5 5

6. Cell Membrane: PHOSPHOLIPIDS
One end of the molecule is “afraid” of the water and one end “loves” being in the water.
Proteins are stuck inside the membrane
Proteins are across the bilayer and make the holes that let ions and molecules in and out of the cell 6

7. Cell Membrane 7

8. CYTOSKELETON Chief functions include:
movement of material through the cell for stuff not diffusion or osmosis
maintaining the shape of the cell
Includes microfilaments & microtubules 8

9. CYTOSKELETON 9

10. Centrioles

11. Centrioles: generally appear in animal cells
they look like two cylinders at right angles to one another
as animal cells prepare for cell division these two centrioles separate and go to opposite ends of the cell.
vilenski.org/science/safari/ cellstructure/mito.html 11 11

12. 12 http://micro.magnet.fsu.edu/cells/animals/images/mitochondria.jpg
Centrioles 12 12

13. Mitochondria Mito = Mighty / Power The Power-House of the cell
They break down food molecules so the cell has the energy to live
If a cell needs a lot of energy…it will have more mitochondria 13

14. The Mitochondria structure has three main parts:
OUTER MEMBRANE: covers the mitochondria
INNER MEMBRANE: folds many times to increase the surface area because chemical reactions
(glycolysis) occur here
sun.menloschool.org/~cweaver/ cells/c/cell_membrane/
So…the more space it has the more energy it can create 14 14

15. Nucleus The “brain” of the cell Controls all of the
cellular activities
DNA is inside the nucleus 15

16. Nucleus are found inside the nucleus CHROMOSOMES-
carry the information that determines what traits a living thing will have
Chromosomes – 16

17. DNA - Deoxyribonucleic acid17

18. DNA - Deoxyribonucleic acid
DNA carries the genetic information of a cell
Consists of thousands of genes
It specifies everything that is needed for the maintenance, function, and replication of the cell
It is made up of 4 different bases:
(A) adenine (C) cytosine
(T) thymine (G) guanine 18

19. DNA - Deoxyribonucleic acid19

20. NUCLEOLUS The dark area in the nucleus
Like a tiny nucleus inside the nucleus. 20

21. MATRIX: a fluid that has water and proteins all mixed together
(like a solution)
The proteins
take the food molecules in and combine them with Oxygen to release the energy
kidneysmetals/07t.html 21 21

22. Endoplasmic Reticulum
also known as the “ER”
it is an organelle inside the cell that is
made up of membranes that are in the CYTOPLASM of the cell
There are two different
Smooth ER
Rough ER 22

23. Smooth ER Main function is to collect, maintain & transport things
Shaped slightly tubular
Creates steroids
Stores Ions for the cell to keep nutrients balanced 23

24. Rough ER It has bumps all over it giving it a “rough” appearance
Bumps are called RIBOSOMES
ER collects the proteins (built by the ribosomes) and creates a bubble around them
VESICLE- is formed when the ER pinches off a part of its membrane 24

25. MOVEMENT of VESICLES
**The vesicle can then move to the Golgi apparatus or the cell membrane
1) If the vesicle floats to the cell membrane, the proteins are going to be sent out of the cell……or (exocytosis)
2) If they move to the Golgi Apparatus, the proteins will be used inside the cell 25

26. Smooth ER vs. Rough ER 26

27. 27

28. The release of intracellular molecules (hormones or proteins)
Secretion
Exocytosis
The release of intracellular molecules (hormones or proteins)
EXOCYTOSIS- 28

29. Osmosis
Osmosis-
the movement of water across the cell membrane 29

30. GOLGI APPARATUS Also called the Golgi Complex
It is made up of a stack of flattened out sacs …like a loose stack of pancakes
WHAT DOES IT DO?
1) it takes simple molecules and combines them to make larger molecules.
2) takes those larger molecules and puts them into packs called GOLGI VESICLES 30

31. GOLGI APPARATUS
Think about building a model of a ship (that's the molecule). Then take that model and put it in a bottle (that's the vesicle). 31

32. Golgi apparatus 32

33. LYSOSOMES (primarily animal)
They combine with the food taken in by the cell
The enzymes in the lysosome bond to food & digest it (acidic interior)
Next…smaller molecules are released which are absorbed by the mitochondria 33

34. LYSOSOMES
When an organelle no longer works, the lysosome will attach itself to it and break it down like food (kind of like a cannibal)
Chemicals can then be reabsorbed or excreted
Lysosomes can also destroy the cell if it breaks open accidentally
“Suicide Sacs”
UV light damages lysosome membrane
The enzymes inside the lysosome spread throughout the cell and digest it 34

35. LYSOSOMES 35

36. Lysosome Animation 36

37. CYTOPLASM Protoplasm- everything inside the cell membrane
Cytoplasm- everything inside the cell membrane & outside of the nucleus except the cell’s nucleus
Cytosol:
Mostly H2O
Contains organelles
Contains salts, dissolved gasses & nutrients 37

38. CYTOPLASM
cytoplasm 38

39. VACUOLE Vacuoles are “bubbles” that float in the cell
Vacuoles are more important to the survival of plant cells than they are to animal cells 39

40. VACUOLE: STORAGE IN PLANT CELLS
Vacuoles in plants support structure
Vacuoles hold onto things that the cell might need…like a backpack
There are some vacuoles that hold onto waste products, similar to having a big septic tank
Storing waste products protects the cell from contamination 40

41. VACUOLE CONT’D
So, when there is no water…the vacuole shrinks and the cell wall is the only thing holding the plant together. 41

42. You will know that a plant's vacuoles are shrinking when you see the plant begin to droop over
HOLDING UP THE WALLS 42

43. Causes “rigidity” so the plant my increase by stacking cells
Turgor Pressure- force exerted by the water entering (osmosis) the vacuole, which then swells exerting internal force on the cell wall
Causes “rigidity” so the plant my increase by stacking cells 43

44. Chloroplast 44

45. Chloroplast the site of photosynthesis in eukaryotic cells
disk-like structures
composed of a single membrane
surrounding a fluid containing stacks of membranous disks 45

46. SOLAR energy radiated from the sun is captured by plants(chloroplast)
Then it is instantaneously changed into ELECTRICAL energy
Then packaged as CHEMICAL energy
Chloroplast
basics/dna/b1.html 46 46

47. Chloroplast photosynthesis takes place inside the chloroplast
the process in which plant use water, carbon dioxide, and energy form the sun to make food
Photosynthesis- 47

48. Chloroplast No energy transformation is 100% efficient
Not all the solar energy captured is converted to electrical and then chemical energy.
Some of it gets lost as heat or other forms of energy (light) 48

49. small dot-like structures in cells
Ribosomes
small dot-like structures in cells
they are often associated with forming
rough ER
Ribosomes are the site of protein synthesis in cells
they are made in the nucleus of the cell
A ribosome can make the average protein in about one minute 49

50. Ribosomes are made up of proteins and ribonucleic acid(RNA)
Ribosome Structure
Ribosomes are made up of proteins and ribonucleic acid(RNA)
These molecules are arranged into two subunits
These subunits are attached to each other and together form the entire ribosome
When viewed through a light microscope the ribosomes appear as dots 50

51. There are two kinds of ribosomes 1) Attached to the rough ER
Types of Ribosomes
There are two kinds of ribosomes
1) Attached to the rough ER
2) floating in the cell cytoplasm
Attached ribosomes make proteins that are used in the ER or transported within the ER
Free ribosomes make proteins that are used in the cytoplasm 51

52. Exercize your brain w/
Homework Questions 52

53. Assignment Part A (slides 1-11)
Directions: Write-out and highlight the following questions. Then use your notes to answer them.
1. Which organelle is known as the “Brain” of the cell?
2. If you look at a picture of a cell, how would you recognize the nucleolus?
3. List the 3 main jobs of the cell membrane
4. Explain why the cell membrane has tiny holes made of protein in it.
5. The term hydro means _________.
A. If something is hydrophobic it is _________
B. If something is hydrophilic it is __________ 53

54. Assignment Part B (slides 11-23)
Directions: Write-out and highlight the following questions. Then use your notes to answer them.
1. Which organelle is known as the Power House” of the cell?
2. The mitochondria of a cell share the same job as the __________ (hint- an organ) in the human body.
3. Explain how you could distinguish the rough ER from the smooth ER.
4. What is the main job of the smooth ER?
5. What type of reactions occur on the inner membrane of the mitochondria? (produces energy)
6. The process of H2O moving across the cell membrane is called? 54

55. Assignment Part C (slides 23-)
Directions: Write-out and highlight the following questions. Then use your notes to answer them.
1. What is the main function of a lysosome?
2. What happens if a lysosome breaks open?
3. Explain the difference between cytoplasm and protoplasm. (draw a diagram if it will help you)
4. Why are vacuoles important to PLANTS?
5. Which organelle is the site of photosynthesis?
6. What are the three main ingredients for photosynthesis? 55

56. Assignment Part D (slides 23-)
Directions: Write-out and highlight the following questions. Then use your notes to answer them.
1. Centrioles are usually found in __________ cells.
2. What is the main function of a centriole?
3. List the two places you can find a ribosome in an animal cell.
4. What do ribosomes make? 56

57. See also wksht to go with questions parts B-D57