NONMEMBRANE BOUND ORGANELLES

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NON-MEMBRANE BOUND ORGANELLES

• Ribosomes
• Microtubules and Microfilaments
• Centrioles
• Cilia and Flagella

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RIBOSOMES

• Composed of RNA and Protein
• 2 subunits 1 large, 1 small
• Manufacture of protein
• Often on Endoplasmic reticulum
• Also free in cytoplasm

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Ribosomes attach to mRNA during protein synthesis
Ribosomes
Protein being built
mRNA
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CYTOSKELETONMICROTUBULES MICROFILAMENTS

• Hollow tube of TUBULIN protein
• Structural support
• Movement

• Fiberlike structures
• ACTIN / MYOSIN
• Cell contraction
• Cell framework

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CENTRIOLES

• 2 sets of microtubules at right angles to each
  other
• 9 groups of microtubules in each set
• animal cells only
• cell division
• assembly and organization of microtubules and
  spindle fibers

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CILIA AND FLAGELLA

• Cell locomotion
• Flagella long and few
• Cilia Short and many
• 9 2 arrangement
• Covered with cell membrane material

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PLANT CELLS

• JUST THE DIFFERENCES IF YOU DONT MIND !!!!

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HOW DO PLANT CELLSDIFFER?

• Cellulose cell wall
• Large central vacuole
• Higher plants do NOT have centrioles (mosses -
  flowers)
• Have plastids in their cells
• chloro, chromo, leuco

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CELLULOSE CELL WALLS
Help with support of the plant cells and the
plant itself
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CENTRAL VACUOLE
Most of the internal space in a plant cell is
occupied by the central vacuole
The central vacuole creates an outward push
called turgor or turgor pressure which helps
support the plant cell. A wilted plant has
lost turgor (plasmolysis)
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Cell Membrane
CELL 1
CELL 2
PLASMODESMATA
Communication
Cell Wall
Space - MIDDLE LAMELLA - filled by PECTINS
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Cellular Connections

• Plants plasmodesmata
• Plants Adhesion of cells
• Middle lamella
• Animals Gap junctions
• heart muscle cells example
• Animals Adhesion of cells
• Tight Junctions intestinal lining
• Desmososmes skin

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CENTRIOLES

• Higher plant cells do NOT have centrioles
• -mosses, ferns, flowers, trees, shrubs, etc.
• Still make spindle fibers and exhibit normal cell
  division

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PLASTIDS

• Plastids may be one of three types
• CHLOROPLASTS - GREEN PLASTIDS
• LEUCOPLASTS - WHITE PLASTIDS
• CHROMOPLASTS -OTHER COLORS

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CHLOROPLASTS
Chloroplasts have a double membrane
like mitochondria and have own DNA
STROMA is the space between the grana
GRANA are the folds of the inner membrane
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Chloroplasts support the Endosymbiotic Theory
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CHLOROPLASTS
Light
Sugar
Chloroplasts are the sites of photosynthesis withi
n plant cells.
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OTHER PLASTIDS

• Leucoplasts starch-storing plastids
• plant organs like potatoes cells
• Chromoplasts pigment storing plastids
• colored plant organs like tomatoes , banana
  peels , flowers, or fall leaves

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HOOKES VIEW OF WINE CORK SLICED THINLY
CELLS