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The Endoplasmic Reticulum. Produces an enormous variety of molecules Is composed of smooth and rough ER. Nuclear envelope. Ribosomes. Rough ER. Smooth ER. The Endoplasmic Reticulum. After the rough ER synthesizes a molecule it packages the molecule into transport vesicles. 4. - PowerPoint PPT Presentation
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The Endoplasmic Reticulum– Produces an
enormous variety of molecules
– Is composed of smooth and rough ER
Nuclearenvelope
Ribosomes
Rough ERSmooth ER
After the rough ER synthesizes a molecule it packages the molecule into transport vesicles
Transport vesiclebuds off
Ribosome Secretoryprotein insidetransportvesicle
ProteinRough ER
Polypeptide
1 2
3
4
The Endoplasmic Reticulum
The Golgi Apparatus
– Works in partnership with the ER– Refines, stores, and distributes the products of cells
Transportvesiclefrom ER
“Receiving” side ofGolgi apparatus
Golgi apparatus
New vesicle forming
Transport vesiclefrom the Golgi
“Shipping” side ofGolgi apparatus
Plasma membrane
• A lysosome is a membrane-enclosed sac
Lysosomes
– It contains digestive enzymes– The enzymes break down macromolecules– They break down damaged organelles
(b) Lysosome breaking down damaged organelle
Lysosome
Damagedorganelle
Digestion
VacuolesVacuoles are membranous sacs
Rough ER
Transportvesicle from ER
Golgiapparatus
Secretoryvesicle from Golgi
Secretoryprotein
Vacuole Lysosome
Plasma membrane
The Endomembrane System
Clicker Question #22. Highly phagocytic cells (cells that take part in lots of phagocytosis), like some of your immune cells, need __________ to degrade their phagocytosed particles.
A. peroxisomesB. phagosomesC. lysosomesD. cytoskeletal proteinsE. ribosomes
Mitochondria are the sites of cellular respiration, which involves the production of ATP from food molecules
Figure 4.18
Outermembrane
Innermembrane
Cristae
Matrix
Space betweenmembranes
Cellular energy conversion
Cytoskeleton● Provides mechanical support to the cell and maintain its shape
The Cytoskeleton
*microfilaments (actin filaments)
*intermediate filaments
*microtubules
Microfilaments
Microtubules*centrosome *centrioles
Cilia and flagella are motile appendages
Cilia and Flagella
• Flagella propel the cell in a whiplike motion
• Cilia move in a coordinated back-and-forth motion
“9 + 2”
basal body
Cilia and Flagella
The Cytoskeleton
dynein – motor molecules
Cytoskeleton
Mitochondrion
Nucleus
Rough endoplamsicreticulum (ER)
Ribosomes
Smoothendoplasmicreticulum (ER)
Golgi apparatus
Plasmodesmata
Plasmamembrane
Chloroplast
Cell wall
Centralvacuole
Not in animal cells
Plant Cells
Plant cells are encased by cell walls
Walls of two adjacentplant cells
Vacuole
Plasmodesmata(channels between cells)
Plant Cells
Chloroplasts are the sites of photosynthesis, the conversion of light energy to chemical energy
ChloroplastsInner and outermembranes ofenvelope
Space betweenmembranes
Stroma (fluid inchloroplast)
Granum