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Slides 1 human cheek cells methylene blue stain 400x

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SLIDES1.*Human cheek cells.Methylene Blue stain, 400Xa.Structures:nucleus (pl. = nuclei), plasma membrane, cytoplasm, bacteria (sing. =bacterium)2.*Potato cells, Iodine stain, 100X or 400Xa.Structures:plasma membrane, cytoplasm, starch granules3.*Onion epithelial cells, Iodine stain, 400Xa.Structures:cell wall, plasma membrane, and nucleus4.Human blood cells, 400Xa.Erythrocytes (Red Blood Cells)b.Leukocytes:multi-lobed nucleus (White Blood Cells)5.*Stew meat, 100X or 400Xa.Muscle cells:actin and myosin contractile units (microfilaments)b.Adipose cells31
6.Liver cells, 400Xa.Structures:nucleus, nucleolus (pl. = nucleoli), chromatin, glycogen granules7.*Elodea or Celery, 100X or 400Xa.Structure:chloroplast(s)8.Liver cells (Amphiuma), 400Xa.Structure:nucleus, mitochondria (sing. = mitochondrion)9.Neurons (Golgi apparatus), 400Xa.Structure:nerve cell body, Golgi bodies10. Human sperm cells, 400Xa.Structure:head, nucleus, acrosome, neck, and flagellum (pl. = flagella)11. Bacteria-three types, 400Xa.Cocci (sing. = coccus)b.Baccilli (sing. = bacillus)c.Spirilla (sing. = spirillum)*Wet MountsNOTE: Some structures may not be visible.RETURN THE MICROSCOPE TO ITSAPPROPRIATESPOT IN THE CABINET.32
1.Human cheek cells _____ X2.Potato cells _______ X3.Onion epithelial cells _____X4.Human blood cells ______ X5.Stew Meat ______ X6.Liver cells ______ X7.Elodea/Celery _______ X8.Liver cells ______ X9.Neurons_______ X10.Human Sperm cells ____X33
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Lab 5DIFFUSION AND OSMOSISINTRODUCTIONThe plasma membrane serves as a "gate keeper", a remarkable structure that allows water anddissolved gases such as oxygen and carbon dioxide to pass freely while differentiating between ionsand small molecules.Some solutes enter and exit the cell while others are barred.This selectivepermeability of the plasma membrane is fundamental to maintaining homeostatic conditions within thecell necessary for life.Molecules that can permeate plasma membranes do so by either passive transport wheremolecules move down their concentration gradients, or by active transport where molecules are movedagainst their concentration gradient. Active transport requires cellular energy, which isprovided by ATP.In today's lab, you will be introduced to two forms of passive transport—diffusionandosmosis, whichdo not require energy.BEFORE COMING TO LAB:1.Read Chapter 5 and your notes from lecture pertaining to diffusion and osmosis.2.Read this lab carefully and be familiar with the words listed under Key Terms.KEY TERMSOBJECTIVESDescribe the process of diffusion at the molecular level;State the physical factors that determine the direction and rate of diffusion;Discuss why diffusion rates, cell volume and surface area are thought to place limits oncell size;Understand the nature of a semi-permeable membrane and why its presence isnecessary for osmosis to occur;Recognize isotonic, hypotonic, and hypertonic environments and the effect they haveon living organisms;Define the key terms listed in this exercise.

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