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Parts of a Eukaryotic Cell
Eu – Good / True Karyote- Kernel (nucleus)
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Cell Membrane The Cell Membrane is made of a phospholipid bilayer
Phospholipids – are made of a glycerol, phosphate, and two fatty acids Bilayer- Two Layers
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Phospholipids (the dancing Baker)
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A Phospholipid Bilayer
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Membranes are Selectively Permeable
Some substances cross the membrane while others cannot cross at all.
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Peripheral Proteins Are located on cell membrane: on the outside of the cell and on the inside of the cell attached to membrane
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Are located in the cell membrane
Integral Proteins Are located in the cell membrane
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Fluid Mosaic Membrane Model
The membrane acts more like a fluid than a solid. Proteins can change locations in the membrane
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Organelles
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Organelles Cytoplasm – the entire contents between the plasma membrane and the nucleus Cytosol- the jelly like substance that surrounds all the organelles
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Mitochondria –the powerhouse
Mitochondria have many internal folds called cristae (Kris-tee) This is the organelle that produces ATP for Energy This organelle has its own “Mitochondrial DNA”
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The inside of the mitochondria is called the MATRIX
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Ribosomes – Protein Assemblers
Ribosomes have no membrane They are: Made of RNA and Protein Responsible for making proteins Found in the cytosol and on the Rough Endoplasmic Reticulum
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Endoplasmic Reticulum – the highway
Rough Endoplasmic Reticulum (ER) - Covered with ribosomes Makes and transports proteins Smooth Endoplasmic Reticulum- Makes Steroids Regulates calcium levels in muscle cells
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Rough And Smooth Endoplasmic Reticulum
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Golgi Apparatus – Packaging and Secreting
Is a series of flattened sacs with a convex shape It makes, packages and distributes proteins to the cell
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Golgi Apparatus
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Lysosomes – the digester
Have a phospholipid monolayer Digest proteins, carbohydrates, lipids and DNA and RNA Contain enzymes that break down old organelles, viruses and bacteria.
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Cytoskeleton – the scaffolding
Provides the structural support for a cell Made of Microfilaments-small threads of actin protein. Responsible for cell movement Microtubules- large hollow tubes that help during mitosis
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Green = Microtubules Blue = Chromosomes Red = Mitochondria
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Responsible for cellular locomotion (movement)
Cilia and Flagella Responsible for cellular locomotion (movement) Cilia – hair like projections from the cell Flagella – one to several extensions from the cell
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Microtubules in a 9:2 Ratio
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Nucleus Contains a nuclear skeleton known as the Nuclear Matrix
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Nucleus Nuclear envelope- surrounds the nucleus
Cromatin – unraveled chromosomes. Chromosomes – contain genetic information Nuclear pores – openings in the nuclear envelope Nucleolus - makes ribosomes
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Cell Wall Only in plant cells
They are rigid structures made of cellulose
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Vacuoles Store waste, food, and water. Makes up most of many plant cells.
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Plastid (found primarily in plant cells)
Chloroplast- captures energy from the sun to make sugar Thylakoid
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