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Chapter 11: The Dynamic Cell |
1. Relevance of Topic
Everything is made from cells, and the cell theory is critical in understanding biology.
Cancer, a disease involving the cell cycle, is relevant to most students' lives.
Modern biology makes use of cell culturing techniques, for example, in mass-producing certain pharmaceuticals.
The cytoskeleton, which is responsible for cell movement, is also critical in cell division.
2. Continuity
This is a more in depth examination of cells, and follows nicely from the introductory material in previous chapters.
The next chapters, covering the genome, can be related to this material most easily by discussing cell division and differentiation, two main topics in genetics.
This chapter examines major organelle complexes; later chapters examine differences between procaryotic and eucaryotic cells in that regard.
3. Demonstration Activities
Text section 11.1
1. Cell division, which increases cell numbers, could be illustrated with Figure 11.2.
2. Cell growth, which increases a cell's volume, might be illustrated using a Protozoan, such as Amoeba, consuming a food particle, which it will process into body mass.
Text section 11.6
1. Use a photograph of hemagglutination to illustrate the idea of cell surface ligands.
2. Figure 11.12 shows the ligand receptor mechanism.
Text section 11.7
1. Animals use pheromones to carry signals between organisms within a species. Males and females of a species use sex pheromones to locate and recognize one another. Show a video of insects being affected by pheromones.
2. Figure 11.15 illustrates the use of pheromones in two insect species.
Text section 11.9
1. Figure 11.19 illustrates the colorful results from electron microscopy, employed in this case to reveal actin in the cytoskeleton.
2. Figure 11.26 illustrates cytoplasmic streaming in plant cells; actin-myosin complexes are responsible for this movement.
Text section 11.10
1. Figure 11.29 illustrates the simplicity of structure in microtubules, specifically, the ATPase end.
2. Show pictures of ciliated and flagellated protists or specialized cells (e.g. sperm); microtubules are responsible for these structures used for movement.
3. Microtubules make up the spindle fibers of the cell apparatus used in mitosis and meiosis; show pictures of the nuclei of dividing cells with the spindle highlighted.
Text section 11.15
1. Figure 11.36, endocytosis and exocytosis, shows these opposite processes that move vesicles of material into and out of cells.
2. Figure 11.37 shows a white blood cell phagocytizing a chain of bacteria; cells engulf relatively larger bits of material through movements of the cell membrane that are directed by actin filaments.
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