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Chapter 3-3: Cell Organelles
Objectives
Describe the role of the nucleus in cell activities. Analyze the role of internal membranes in protein production. Summarize the importance of mitochondria in eukaryotic cells. Identify three structure in plant cells that are absent from animal cells.
The Nucleus (Boss’s office)
The nucleus is an internal compartment that houses the cell’s DNA (the boss). Most functions of a eukaryotic cell are controlled by the cell’s nucleus. The nucleus is surrounded by a double membrane called the nuclear envelope. Scattered over the surface of the nuclear envelope are many small channels called nuclear pores (doors & windows in office).
Ribosomal proteins and RNA (memo from office) are made in the nucleus. Ribosomes are partially assembled in a region of the nucleus called the nucleolus.
Ribosomes and the Endoplasmic Reticulum (path in factory = Jetson’s moving
walkway) (Label)
Ribosomes (assembly line) are the cellular structures on which proteins are made. The Endoplasmic Reticulum or ER is an extensive system of internal membranes that move proteins and other substances through the cell. The part of the ER with attached ribosomes is called the rough ER. The rough ER helps transport proteins that are made by the attached ribosomes. New proteins enter the ER. The portion of the ER that contains the completed protein pinches off to form a vesicle. A vesicle is a small, membrane-bound sac that transports substances in cells. The ER moves proteins and other substances within eukaryotic cells.
Packaging and Distribution of Proteins (UPS or shipping department)
Vesicles that contain newly made proteins move through the cytoplasm from the ER to an organelle called the Golgi apparatus. The Golgi apparatus is a set of flattened, membrane-bound sacs that serve as the packaging and distribution center of the cell.
Structures of Plant Cells
Plants have three unique structures that are not found in animal cells: o Cell Wall (separate outside from inside) o Chloroplasts (solar panels)
o Central Vacuole (storage area)
The cell membrane of plant cells is surrounded by a thick cell wall, composed of proteins and carbohydrates. The cell wall o helps support and maintain the shape of the cell o protects the cell from damage
o connects the cell with adjacent cells
(Label)
Chloroplasts are organelles that use light energy to make carbohydrates from carbon dioxide and water. Chloroplasts, along with mitochondria, supply much of the energy needed to power the activities of plant cells. Chloroplasts, like mitochondria, have their own DNA and reproduce independently of the plant cell. Chloroplasts, like mitochondria, are thought to be descendents of ancient prokaryotes.
Central Vacuole:
Most of a plant cell’s volume is taken up by a large, membrane-bound space called the central vacuole. The central vacuole stores water and may contain ions, nutrients, and wastes.
Found in plant and animal cells: Found only in plant cells:
1. Cell membrane 1. Cell wall
2. Ribosome 2. Chloroplast
3. Endoplasmic reticulum 3. Large vacuole
4. Lysosome
5. Golgi complex
6. Mitochondrion
