Eukaryotic cells contain organelles that allow the specializations and the separation of functions within the cell.
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1 Section 3: Eukaryotic cells contain organelles that allow the specializations and the separation of functions within the cell. K What I Know W What I Want to Find Out L What I Learned
2 Essential Questions What are the structures of a typical eukaryotic cell, and what are their functions? What are the similarities and differences between plant and animal cells?
3 Vocabulary Review enzyme New cytoplasm cytoskeleton ribosome nucleolus endoplasmic reticulum Golgi apparatus New continued vacuole lysosome centriole mitochondrion chloroplast cell wall cilium flagellum
4 Cytoplasm and Cytoskeleton The environment enclosed by the plasma membrane is a semifluid material called cytoplasm. In prokaryotes, all the chemical processes of the cell take place directly in the cytoplasm. In eukaryotes, these processes take place within organelles in the cytoplasm.
5 Cytoplasm and Cytoskeleton The cytoskeleton is a supporting network of long, thin protein fibers that form a framework for the cell and proved an anchor for the organelles. Microtubules are long, hollow protein cylinders that form a rigid skeleton for the cell and assist in moving substances within the cell. Microfilaments are thin protein threads that help give the cell shape and enable the part or the entire cell move.
6 Visualizing Cells Animation FPO Add link to Visualizing Cells from page 192 (figure 9) here.
7 The nucleus Contains most of the cell s DNA, which stores information used to make proteins that determine a cell s growth, function, and reproduction Is surrounded by a double membrane called a nuclear envelope
8 BrainPOP FPO Add link to BrainPOP from page 193 here.
9 Ribosomes Ribosomes are organelles that manufacture proteins. Not membrane-bound like other organelles Produced inside the nucleus in the nucleolus
10 Endoplasmic reticulum The endoplasmic reticulum (ER) is a membrane system of folded sacs and interconnected channels that serves as the site for protein and lipid synthesis. Two types: rough and smooth
11 Cellular Pursuit Virtual Lab FPO Add link to Virtual Lab from page 194 (Cellular Pursuit) here.
12 Golgi apparatus The Golgi apparatus is a flattened stack of membranes that modifies, sorts, and packages proteins. Proteins are packaged into sacs called vesicles, which can fuse to the plasma membrane and release the proteins to the environment.
13 Vacuoles A vacuole is a membrane bound sac used for temporary storage. Vacuoles store food, enzymes, or waste. Vacuoles are only found in plant cells.
14 Lysosomes Lysosomes are vesicles that contain substances that digest excess or wornout organelles and food particles. They also digest bacteria or viruses that invade the cell.
15 Centrioles Centrioles are organelles made of microtubules that function during cell division. They are located in the cytoplasm.
16 Mitochondria Mitochondria convert fuel particles into usable energy. They have an outer membrane and a highly folded inner membrane that provides surface area for breaking the bonds in sugar molecules.
17 Chloroplasts Plant cells and some other eukaryotes contain chloroplasts, which capture light and convert it into chemical energy in process called photosynthesis. They are composed of multiple small disks called thylakoids, which contain the light capturing pigment chlorophyll.
18 Cell wall Plant cells have a cell wall a thick, rigid, mesh of fibers that surround the outside of the plasma membrane. Protect the cell and give it structure Are made from a carbohydrate called cellulose
19 Cilia and flagella Cilia are short, numerous projections that look like hair. Move in tandem like oars in a rowboat Flagella are longer and less numerous than cilia. Move with a whip-like motion Both are made of microtubules.
20 Summary of Cell Structures Interactive Table FPO Add link to interactive table from page 199 (Table 1) here.
21 Comparing Cells Features plant cells have that animal cells generally do not: Chloroplasts/chlorophyll Vacuoles Cell walls
22 Organelles at Work An understanding of different organelles allows for an understanding of cellular processes. Protein synthesis: Begins in the nucleus with information contained in DNA RNA and ribosomes leave the nucleus and produce a protein on the endoplasmic reticulum. Proteins produced in the ER are sent to Golgi apparatus for packaging. Packaged proteins are delivered to other organelles where they serve a variety of functions.
23 Review Essential Questions What are the structures of a typical eukaryotic cell, and what are their functions? What are the similarities and differences between plant and animal cells? Vocabulary cytoplasm cytoskeleton ribosome nucleolus endoplasmic reticulum Golgi apparatus vacuole lysosome centriole mitochondrion chloroplast cell wall cilium flagellum
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