Organelles

1
Organelles Chapter 6

2
Plasma Membrane

• Serves as a boundary between cell and environment
• Controls passage of materials into and out of cell

3
Nucleus

• Manages all cell functions
• Contains cells genetic material DNA
• Nuclear envelope with pores
• Contains one or more nucleoli

4
Cytoskeleton

• Network of proteins
• Contains hollow microtubules and thick, solid
  microfilaments
• Provides shape, internal organization, and
  movement

5
Lysosomes

• Site of intracellular digestion
• Digests worn out cell parts, invaders, and food
  particles

6
Centrioles

• Occurs in pairs during cell division
• Help the cell to divide during mitosis
• Only found in animal and protist cells

7
Cell Wall

• Formed by living plant cells
• Made of cellulose rigid support structure
• Protects plants and allows for turgor pressure

8
Mitochondria

• Enclosed in a double-membrane
• Provides the cell with energy
• Most reactions of cellular respiration occur here
• Contains small amounts of DNA and RNA
• May have several hundred per cell

9
Endoplasmic Reticulum (ER)

• Tubular membrane system that provides surface
  area for chemical reactions
• Plays a central role in biosynthesis reactions in
  the cell
• Transports compounds made
• Rough ER is studded with ribosomes
• Smooth ER lacks ribosomes

10
Golgi Apparatus

• System of flattened sacs
• Modifies, sorts, and packages macromolecules in
  vesicles for secretion or for delivery to other
  organelles.

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Cytosol/Cytoplasm

• Semi-fluid material surrounding organelles
• Cellular activities occur here
• Contains enzymes that catalyze cellular reactions

12
Chloroplasts

• Membrane system forms thylakoids which contains
  light absorbing pigments
• All reactions of photosynthesis occur in
  chloroplasts
• Found in plants and plant-like protists

13
Vacuoles

• Store Materials such as
• Water, food, digestive enzymes, nutrients, and
  waste products
• Occupies about 50 of plant cells volume

14
Ribosomes

• Produces Proteins
• Found in the cytoplasm and on the Rough
  Endoplasmic reticulum