Anatomy and Physiology Answer Key

2 membranes are critical to the functioning of cells

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Unformatted text preview: is (smooth ER), packaging and secretion (Golgi), and isolation of enzymes in compartments for cellular defense (peroxisomes, lysosomes). Membranes bind enzymes in a reaction sequence (as in the respiratory chain) or keep them together in a region where reactions occur (Krebs cycle enzymes). The components of membranes are also important in cellular recognition and communication. (e) Name: Golgi apparatus Location: In cytoplasm associated with the smooth endoplasmic reticulum, often close to the nucleus. Function: Final modification of proteins and lipids. Sorting and storage for use in the cell or packaging molecules for export. Visible under LM: Not with most standard school LM, but may be visible using high quality, high power LM. (f) Name: Nucleus Location: Discrete organelle, position is variable. Function: The control center of the cell; the site of the nuclear material (DNA). Visible under LM: Yes. (g) Name: Endoplasmic reticulum (in this case, rough ER) Location: Penetrates the whole cytoplasm Function: Involved in the transport of materials (e.g. proteins) within the cell and between the cell and its surroundings. Visible under LM: No Biozone International 2009 Photocopying Prohibited 5 (h) Name: Lysosome and vacuole (given) Lysosome Location: Free in cytoplasm. Function: Ingests and destroys foreign material. Able to digest the cell itself under some circumstances. Visible under LM: No Vacuole (vacuole in an animal cell is shown). Location: In cytoplasm. Function: In animal cells, vacuoles are smaller and more numerous than in plant cells, and are involved in storage (of water, wastes, and soluble pigments). Visible under LM: No in animal cells but yes in plant cells. (i) (j) Name: Cilia and flagella (given) Location: Anchored in the cell membrane and extending outside the cell. Function: Motility. Visible under LM: Variably (depends on magnification and preparation/fixation of material). 6. (a) Hypotonic (b) Fluid replacements must induce the movement of water in...
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