Nucleus Is made of 4 parts: 1.Chromatin 2.Nucleolus 3.Nuclear Envelope 4.Nuclear Pore
Chromatin A network of strands that undergoes coiling into rod-like structures called chromosomes, just before the cell divides.
Nucleolus Where the Ribosomal RNA (rRNA) is produced and where tRNA joins with proteins to form subunits of ribosome's
Nuclear Envelope and Pores Nuclear Envelope Separates the nucleus from the cytoplasm Nuclear Pores permits the passage of proteins into and out of the nucleus
Responsibility of the Nucleus Nickname: “The Control Center” Function: 1. Holds the DNA 2. Directs cell activities 3. Separated from cytoplasm by nuclear membrane 4. Contains genetic material - DNA
Ribosomes Function: makes proteins Each cell contains thousands Make proteins Found on ribosomes & floating throughout the cell http://library.thinkquest.org/12413/structures.html
Endoplasmic Reticulum Nickname: “Roads” Function: The internal delivery system of the cell No ribosome's Makes fats and lipids Smooth ER Rough ER Have Ribosome's Makes proteins
Golgi Apparatus/Bodies Function: Protein 'packaging plant' Move materials within the cell Move materials out of the cell http://library.thinkquest.org/12413/structures.html Nickname: The shippers Appearance: stack of pancakes
Lysosome Function: to break down food into particles the rest of the cell can use and to destroy old cells Transports undigested material to cell membrane for removal http://library.thinkquest.org/12413/structures.html Nickname: “Clean-up Crews” Appearance: circular, but bigger than ribosomes
Peroxisomes Are abundant in cells that metabolize lipids; in liver and yeast cells they detoxify alcohol.
Centriole Found in animal cells only Involved in the organization of the mitotic spindle and in the completion of cytokinesis
Vacuoles Membrane-bound sacs for storage, digestion, and waste removal Contains water solution Help plants maintain shape http://library.thinkquest.org/12413/structures.html
Mitochondria http://library.thinkquest.org/12413/structures.html Nickname: “The Powerhouse” Function: Energy formation Breaks down food to make ATP ATP: is the major fuel for all cell activities that require energy
Cytoskeleton Provides the cell's cytoplasm with structure and shape. There are 3 kinds: Filaments Microfilaments microtubules
Cytoplasm Gel-like mixture Surrounded by cell membrane Contains hereditary material
Cell Membrane Controls movement of materials in and out of the cell Double layer http://library.thinkquest.org/12413/structures.html
Now let’s talk about structures only found in PLANT Cells!! Vacuoles Function: stores water This is what makes lettuce crisp When there is no water, the plant wilts Chloroplasts Function: traps energy from the sun to produce food for the plant cell. Green in color because of chlorophyll, which is a green pigment
Cell Walls provides the cell with structural support, protection, and acts as a filtering mechanism.
Put your skills to the test! http://www.cellsalive.com/cells/cell_model.htm http://www.execulink.com/~ekimmel/drag_gr11/organell.htm
A biology student observed the cells shown below under a microscope. These cells most likely came from A. an animal. B. an archaebacterium. C. a fungus. D. a plant.