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

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

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

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

Cell Membrane: PHOSPHOLIPIDS Each phospholipids has a HYDROPHOBIC and HYDROPHILIC end http://www.biology.arizona.edu/chh/problem_sets/kidneysmetals/graphics/bilayer.gif http://sun.menloschool.org/~cweaver/cells/c/cell_membrane/heads.jpg http://www.thomsonlearning.com.au/biology/guide/unit_3/unit111.html?/biology/guide/unit_3/s1a.html~maintext HYDRO = means water PHOBIC = means afraid PHILIC = means loving

Cell Wall Rigid structure that gives support to plant cells Made of chitin or cellulose

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 vilenski.org/science/safari/ cellstructure/mito.html

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 http://micro.magnet.fsu.edu/cells/animals/images/mitochondria.jpg So…the more space it has the more energy it can create

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 http://cwx.prenhall.com/horton/medialib/media_portfolio/text_images/FG01_15-03UN.JPG

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

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

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

Smooth ER vs. Rough ER http://micro.magnet.fsu.edu/cells/animals/images/endoplasmic.jpg

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

GOLGI APPARATUS Pic: http://biology4kids.com/files/cell_golgi.html 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).

Golgi apparatus

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

LYSOSOMES

CYTOPLASM Cytoplasm- everything inside the cell membrane & outside of the nucleus except the cell’s nucleus

CYTOSKELETON Chief functions include: movement of material through the cell for stuff not diffusion or osmosis maintaining the shape of the cell keeping the cell from getting smashed

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

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

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

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

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

Chloroplast www.cbs.dtu.dk/staff/dave/ roanoke/oakcell.html

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

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

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

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 __________

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?

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?

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?

See also wksht to go with questions parts B-D