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Plant Cell
Plant Cell
Nuclearenvelope
Ribosome(attached)
Ribosome(free)
Smooth endoplasmicreticulum
Nucleus
Rough endoplasmic reticulum
Nucleolus
Golgi apparatus
Mitochondrion
Cell wall
CellMembrane
Chloroplast
Vacuole
Section 7-2
Figure 7-5 Plant and Animal Cells
Animal Cell
Animal Cell
Centrioles
NucleolusNucleus
Nuclearenvelope
Rough endoplasmic reticulum
Golgi apparatus
Smooth endoplasmicreticulum
Mitochondrion
CellMembrane
Ribosome(free)
Ribosome(attached)
Section 7-2
Figure 7-5 Plant and Animal Cells
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The Cell Theory
• All living things are composed of cells
• Cells are the basic units of structure & function in living things
• New cells are produced from existing cells
Organelles & Cell Division
• Cells are made of specialized structures known as organelles
• Cell biologists divide cells into 2 parts – Nucleus– cytoplasm
Cell Membrane (plant & animal)
• Separates inside of cell from the outside• Phospholipid bilayer and proteins
Cytoplasm (plant & animal)
• Fluid part of the cell that is outside the nucleus
• Houses the organelles
Nucleus (plant & animal)
• Control center• Surrounded by nuclear envelope
– 2 membranes with pores• Allows for movement of information into & out of the
nucleus
• Visible material = chromatin– DNA bound to protein
• Nucleolus – small dense region where ribosome assembly begins
Ribosomes (plant and animal)
• Small particles of RNA & proteins found through out the cytoplasm
• Proteins are made on the ribosomes– Follow coded instructions from the nucleus
Endoplasmic Reticulum (both)
• Internal membrane system• lipid components of cell membrane are
assembled • proteins & other materials are exported from
the cells
Rough & Smooth ER (both)
• Rough ER – involved in protein synthesis– b/c has ribosomes on surfaces
• Smooth ER – has collections of enzymes performing specialized tasks– b/c NO ribosomes
Golgi Apparatus (both)
• Looks like a stack of closely apposed membranes
• Modify, sort & package proteins & other materials from ER
• Proteins are shipped from here to their final destination
Lysosomes (plant and animal)
• Small organelles filled with enzymes• Gets rid or the “junk”
– Digestion of:• Lipids• Carbohydrates• Proteins• Breaks into small molecules to be used by cell
– Break down old organelle
Vacuoles (plant & animal)
• A saclike structure• A storage place for:
– Water– Salts– Proteins– Carbohydrates
• In plant cells: single, large, provides support b/c of pressure
Mitochondria (plant & animal)
• The power house• Convert chemical energy in food into
compounds that are more convenient for cells• Enclosed by 2 membranes• Contains it own DNA molecules• Come from MOM
Chloroplasts (plant only)
• Capture energy from sunlight• Convert it to chemical energy through
photosynthesis• Surrounded by 2 membranes• Contains chlorophyll• Contains small DNA molecules
Cell Wall (plant only)
• Made of cellulose • Provides support and
structure• Surrounds the cell
membrane
Cytoskeleton (plant & animal)
• A system of protein filaments structures– Provide supports & organization– Involved in movement
• Microfilaments• Microtubules
Microfilaments
• Thread like structures made of actin– Protein
• Tough but flexible • Movement caused by assembly & disassembly
of these structures– Allows for crawling such as amoebas
Microtubules
• Hollow structures made of tubulins– Proteins
• Maintain shape• Important for cell division
– Form centrioles -- help to organize cell division
• Form projections – cilia & flagellum – Rapid swimming through liquids
What structures are found in plant cells but not animal cells? Why are
these structures important for plants?