Chapter 4 Cells

Chapter 4 Cells - Chapter 4: CellsOverview of Cellular...

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Chapter 4: Cells—Overview of Cellular Organelles I. Surface area-to-volume ratio a. determines the amount of chemical activity. b. determines the amount of substance exchange. II. Plasma Membrane a. Composed of a bilayer b. May be selectively : allows only certain substances to enter—this allows for regulation. III. Prokaryotic v Eukaryotic Cells Prokaryotes Eukaryotes IV. NUCLEUS a. Enclosed by a (phospholipids bilayer), which contains nuclear pores. b. Contains the cell’s i. When cell in not dividing—DNA is found as . ii. Before dividing—chromatin condenses and tightly coils into . c. Nucleolus (can be more than 1): source of rRNA i. Begins the assembly of . V. RIBOSOMES a. Region of . i. Central Dogma: DNA mRNA (protein). b. In eukaryotic cells, they’re found: i. , attached to , or inside (e.g. mitochondrial matrix, chloroplast stroma**). 1
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ENDOMEMBRANE SYSTEM (ER + GOLGI) VI. ENDOPLASMIC RETICULUM (ER) a. Extensive system of .
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This note was uploaded on 04/19/2011 for the course LS 2 taught by Professor Pires during the Spring '08 term at UCLA.

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Chapter 4 Cells - Chapter 4: CellsOverview of Cellular...

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