2 Cell Organelles Organelle= “little organ” Found only inside eukaryotic cells
3 Cell Membrane Boundary of the cell Selectively permeable – allows only certain substances across!Made of a phospholipid bilayer, mosaic of lipids, proteins, etc.
4 Nucleus Control center of the cell Contains DNA Surrounded by a double membraneNucleolus – located within the nucleus, makes ribosomes
5 Cytoskeleton Acts as skeleton and muscle Provides shape and structure Helps move organelles around the cellMade of three types of filaments
6 Endoplasmic Reticulum A.K.A. “ER”Connected to nuclear membraneNetwork of passageways “Highway” of the cellRough ER: studded with ribosomes; it makes proteinsSmooth ER: no ribosomes; it makes lipids
7 That looks familiar…what is a polypeptide? RibosomeSite of protein synthesis (where proteins are made!)Found attached to rough ER or floating free in cellProduced in a part of the nucleus called the nucleolusThat looks familiar…what is a polypeptide?
8 Golgi Apparatus Looks like a stack of plates Stores, modifies and packages proteinsMolecules transported to and from the Golgi by means of vesicles
9 Lysosomes Garbage disposal of the cell Contain digestive enzymes that break down wastes
10 Mitochondria “Powerhouse of the cell” Cellular respiration occurs here to release energy for the cell to useBound by a double membraneHas its own strand of DNA
11 Chloroplast Found only in plant cells Contains the green pigment chlorophyllSite of food (glucose) production in photosynthesisBound by a double membrane
12 Cell Wall Found in plant and bacterial cells Rigid, protective barrier Located outside of the cell membraneMade of cellulose (fiber)
13 VacuolesStorage container for water, food, enzymes, wastes, pigments, etc.Large central vacuole usually in plant cellsMany smaller vacuoles in animal cells
14 Centriole Aids in cell division Usually found only in animal cells Made of microtubules
15 Quick Review Which organelle is the control center of the cell? NucleusWhich organelle holds the cell together?Cell membraneWhich organelles are found in plant cells, but not found in animal cells?Cell wall, central vacuole, chloroplastsWhich organelle helps plant cells make food?ChloroplastsWhat does E.R. stand for?Endoplasmic reticulum