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Cell Structure & Function

Learn about the definition of a cell, cell theory, types of microscopes, examples of cells, cell membranes, cell organelles, and their functions.

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Cell Structure & Function

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  1. Cell Structure & Function

  2. Definition of a Cell • A cell is the smallest unit that is capable of performing life functions.

  3. Robert Hook • Credited for discovering cells. Viewed cork cells through a compound light microscope in the mid-1600’s

  4. Cell theory • All living things are made up of cells. • The basic unit of living things is the cell • All cells come from preexisting cells through cell division.

  5. Compound light microscope • Uses light and multiple objective lenses to look at objects • Can view a living organism • Magnifies to micrometers

  6. Electron Microscope • Uses a beam of electrons to magnify objects • Usually kills organisms • Magnifies to nanometers so organelles can be seen

  7. 2 types of electron microscopes • Scanning electron microscope (SEM)-looks at the surface of the specimen • Transmission Electron Microscope (TEM)- looks at the interior of the specimen

  8. Examples of Cells Amoeba Proteus Plant Stem Bacteria Red Blood Cell Nerve Cell

  9. Two Types of Cells Prokaryotic Eukaryotic

  10. Prokaryotic • No nucleus and no membrane bound organelles • Examples: bacteria (anything Kingdom Monera) http://library.thinkquest.org/C004535/prokaryotic_cells.html

  11. Eukaryotic • Contains a nucleus and membrane bound organelles (ex: fungi, plants, animals) Plant Animal http://library.thinkquest.org/C004535/eukaryotic_cells.html

  12. “Typical” Animal Cell

  13. “Typical” Plant Cell

  14. Surrounding the Cell

  15. Plasma (Cell) Membrane • Found in both plant and animal cells • Boundary between the cell and it’s environment, allows a steady supply of nutrients to come into the cell http://library.thinkquest.org/12413/structures.html

  16. Selectively Permeable • It allows only certain particles to enter and leave the cell

  17. Structures of the cell membrane • Phospholipid bilayer- phosphorus head (hydrophilic) and lipid tail (hydrophobic) • Proteins- aids in transport of particles into and out of a cell • Carbohydrates • cholesterol

  18. Fluid mosaic model • Called this because it contains a number of different compounds (mosaic) and many of the compounds move around in the membrane

  19. Inside the Cell

  20. Nucleus • Found in both plant and animal • Control center of the cell because it contains chromatin (DNA and protein) • Enclosed by a porous nuclear envelope

  21. Nucleolus • Region within • nucleus that makes • ribosomes

  22. Cytoplasm Watery/Gel-like mixture Found between nucleus an cell membrane Contains organelles

  23. Cell Wall • Found in plant cells only • Strong/stiff nonliving layer outside of the cell • Not selectively permeable, very porous • Contains cellulose to provide support/protection

  24. Organells

  25. Ribosomes • Small grain like body made primarily of RNA. • Produced by nucleolus. Can be attached or floating free in the cytoplasm http://library.thinkquest.org/12413/structures.html

  26. Ribosomes cont.. Function: make protein Found in plants and animals

  27. Endoplasmic Reticulum Moves materials around in cell Smooth type: lacks ribosomes Rough type (pictured): ribosomes embedded in surface

  28. Rough ER • Series of highly folded membranes that contain ribosomes • Produce proteins and transport them to the golgi. Releases proteins to be transported in the vesicle

  29. Smooth ER • Series of highly folded membranes that do NOT contain ribosomes • Produce lipids and transports to golgi • Releases lipids to be transported into vesicle • Found in both plants and animals

  30. Golgi Bodies • Flattened tubular membranes • Sorts, stores, modifies, packages, and transports materials.

  31. Golgi cont.. • Releases materials into vesicle to be transported to other areas of the cell or to be released from the cell • Found in plant and animal cells

  32. Chloroplast • Large green structures that contain chlorophyll (green pigment) • Captures light energy and converts it to chemical energy (glucose) Found in plants only http://library.thinkquest.org/12413/structures.html

  33. Mitochondria • Rod-shaped. • Has a greatly folded inner membrane to increase surface area • Site for cellular respiration, converts chemical energy (glucose) to usable energy (ATP) • Found in plants an animals

  34. Vacuoles • Sacs in the cytoplasm used for temporary storage • Stores food, water, wastes and other materials http://library.thinkquest.org/12413/structures.html

  35. Plant cells have a large Central Vacuole that makes a plant turgid • Vacuoles are found in plant and animal cells

  36. Lysosome • Small round sacs in cytoplasm that contain enzymes • Break down excess or worn out organelles, food, particles, old cells, viruses, and bacteria. • Found in animal cells only

  37. Cytoskeleton • Support structure composed of tiny rods (microfilaments) and filaments • Forms framework for the cell. Maintains cells shape and assist organelles in moving from place to place. Microtubules that extend outside of the cell membrane cilia and flagella

  38. Centriole • A cylinder shaped structure • Aids in cell division • Found in animal cells only

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