Basic Structure of a Cell. copyright cmassengale
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1 Basic Structure of a Cell 1
2 Prokaryotes The first Cells Cells that lack a nucleus or membrane-bound organelles Includes bacteria Simplest type of cell Single, circular chromosome 2
3 Prokaryotes Nucleoid region (center) contains the DNA Surrounded by cell membrane & cell wall (peptidoglycan) Contain ribosomes (no membrane) in their cytoplasm to make proteins 3
4 Eukaryotes Cells that HAVE a nucleus and membranebound organelles Includes protists, fungi, plants, and animals More complex type of cells 4
5 Eukaryotic Cell Contain 3 basic cell structures: Nucleus Cell Membrane Cytoplasm with organelles 5
6 Two Main Types of Eukaryotic Cells Plant Cell Animal Cell 6
7 Organelles 7
8 Organelles Very small (Microscopic) Perform various functions for a cell Found in the cytoplasm Most are membrane-bound 8
9 Animal Cell Organelles Nucleolus Nucleus Nuclear envelope Rough endoplasmic reticulum Ribosome (attached) Ribosome (free) Cell Membrane Mitochondrion Smooth endoplasmic reticulum Golgi apparatus Centrioles 9
10 Plant Cell Organelles 10
11 Outside of cell Cell (Plasma) Membrane 2 layers of phospholipids (lipid bilayer) FUNCTION: Controls what enters or leaves the cell Analogy: Mrs. Melissa (or a security guard) = controls who comes in or out of the school Surrounds outside of ALL cells Proteins Carbohydrate chains Cell membrane Inside of cell (cytoplasm) Protein channel Lipid bilayer 11
12 Cell Wall Cell wall Thick, tough layer made of cellulose in plants FUNCTION = Supports & protects the cell Found outside of the cell membrane Found in plants, fungi, & bacteria NOT in ANIMAL CELLS Analogy = Walls of the school (support & protect) 12
13 Cytoplasm (Cytosol) of a Cell Jelly-like substance inside cell membrane FUNCTION: Provides a place for chemical reactions to happen Contains organelles to carry out specific jobs Found in ALL cells Analogy = air in the school (fills up the rest of the space and allows learning to happen) cytoplasm 13
14 Mitochondria (singular = mitochondrion) Powerhouse of the cell FUNCTION: Generate cellular energy (ATP) Site of CELLULAR RESPIRATION (burning glucose) More active cells like muscle cells have MORE mitochondria All eukaryotes have mitochondria (plant, animal, fungi & protists) Analogy = generator or electrical wiring (provides electrical power 14
15 Chloroplasts Contains enzymes & pigments for Photosynthesis FUNCTION: Site of Photosynthesis using light to make food from CO 2 & H 2 O Only in Algae (protists) & Plants Never in animal, fungi, or bacterial cells Analogy = cafeteria (makes food) 15
16 Lysosomes Contain digestive enzymes FUNCTION: Break down food, bacteria, & worn out cell parts so that the materials can be used by the cell Programmed for cell death Found in ALL Eukaryotes (plants, animals, fungi & protists) Analogy = janitors or recycling center (break down things; help keep school clean & functioning) 16
17 Lysosome Digestion Cells take in food by phagocytosis Lysosomes digest the food & get rid of wastes 17
18 Vacuoles FUNCTION: Fluid filled sacks for storage (mostly water but also wastes, food, etc...) Large Central Vacuole in Plants Small or absent in animal No vacuoles in bacteria Analogy = Storage closets & filing cabinets in a school (store materials to be used later) In plants, they store Cell Sap Includes storage of sugars, proteins, minerals, lipids, wastes, salts, water, and enzymes 18
19 Endomembrane System Includes nuclear membrane connected to ER connected to cell membrane (transport) 19
20 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 20
21 Rough Endoplasmic Reticulum (ER) Has ribosomes on its surface & is attached to nuclear membrane FUNCTION: Makes membrane proteins and modifies proteins for transport out of cell ALL eukaryotes Analogy = Technology and Textbooks in a school (used by teachers to modify students) 21
22 Smooth Endoplasmic Reticulum (ER) Smooth ER does NOT have ribosomes on its surface & is attached to the ends of rough ER FUNCTION: Makes Lipids for cell membrane & cell products that are USED INSIDE the cell Detox (destroys harmful substances) ALL eukaryotes Analogy = School Nurse (maintains/monitors student health while in the school) 22
23 Golgi Bodies Look like a stack of pancakes FUNCTION: Modify, sort, & package molecules from ER for storage OR transport out of cell 23
24 Golgi Bodies Stacks of flattened membranes (disks) FUNCTION: Modify & Package proteins made on the rough ER Transport vesicles with modified proteins pinch off the ends Transport ALL Eukaryotes vesicle Analogy = Guidance Counselors (deal with student schedules and scholarships for after high school) 24
25 Nucleus - The Control Organelle FUNCTION: Controls the normal activities of the cell Contains the DNA (chromosomes) Surrounded by a nuclear envelope (membrane) with pores Usually the largest organelle ALL Eukaryotes Analogy = School Principal (controls what happens in the school) 25
26 Nuclear Membrane (Envelope) Double membrane surrounding nucleus FUNCTION: Contains nuclear pores for materials to enter & leave nucleus Connected to the rough ER ALL Eukaryotes Analogy = Main Office & Secretaries (protect student records & send messages from the principal) Nuclear pores 26
27 Inside the Nucleus - The genetic material (DNA) is found FUNCTION: These are the instructions for making proteins DNA is spread out And appears as CHROMATIN in non-dividing cells Analogy = Student Records DNA is condensed & wrapped around proteins forming as CHROMOSOMES in dividing cells 27
28 What Does DNA do? DNA is the hereditary material of the cell Genes that make up the DNA molecule code for different proteins 28
29 Nucleolus Inside nucleus Dense region that does NOT contain DNA Disappears when cell divides FUNCTION: Makes ribosomes that make proteins ALL Eukaryotes Analogy = Board of Education (hires teachers) 29
30 Ribosomes Can be Attached to Rough ER OR Free (unattached) in the Cytoplasm 30
31 Ribosomes FUNCTION: Makes Proteins! Protein factories for cell Process called protein synthesis Join amino acids together to make proteins ALL CELLS (prokaryotes & eukaryotes) Analogy = Teachers in the School (teachers build student learning; students would be the proteins) 31
32 Centrioles Paired structures near nucleus Made of bundle of microtubules Appear during cell division forming mitotic spindle FUNCTION: Help to pull chromosome pairs apart to opposite ends of the cell Found only in animal cells None for a school (School analogy is for a plant cell) BUT you could say it is like 2 tug of war teams 32
33 Centrioles & the Mitotic Spindle Made of MICROTUBULES (Tubulin) 33
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