3.2 Cell Organelles
KEY CONCEPT Eukaryotic cells share many similarities like organelles
(mini-organs) Open your text to pg.
74!

3.2 Cell Organelles
Cells have an internal structure .
• The cytoskeleton:
– supports and shapes cell
– helps position and transport organelles
– provides strength
– assists in cell division
– aids in cell movement
– Refer to page 73 in your text book

3.2 Cell Organelles
Several organelles are involved in making and processing proteins .
• The nucleus stores genetic information ( DNA - that is the
code for making proteins)
• The endoplasmic reticulum is a transport system for proteins

3.2 Cell Organelles
• There are two types of endoplasmic reticulum :
– rough ER with ribosomes on it
– smooth ER without ribosomes
– Ribosomes link amino acids to make proteins

3.2 Cell Organelles
Golgi apparatus: Processes, sorts, and delivers proteins

3.2 Cell Organelles
• Vesicles are membrane-bound sacs that hold materials

3.2 Cell Organelles
• Mitochondria supply energy to the cell

3.2 Cell Organelles
Vacuoles are fluid-filled sacs that hold materials

3.2 Cell Organelles

3.2 Cell Organelles
• Centrioles are tubes found in the centrosomes
– Centrioles help divide
DNA
– Centrioles form cilia and flagella

3.2 Cell Organelles
Plant cells have cell walls and chloroplasts
– animal cells do not
• A cell wall provides rigid support
(because of cellulose…)

3.2 Cell Organelles
• Chloroplasts convert solar energy to chemical energy (make food for the plant)