Worksheet 2 1. a) Define a cell. b) What is a unicellular organism? c) Can a cell be multicellular? a) Cell: Smallest unit that displays the properties of life; always contains cytoplasm surrounded by a plasma membrane. b) Unicellular Organism: An organism that consists of only one cell‚ unlike a multicellular organism that consists of multiple cells. c) No single cell is multicellular; however‚ it has been noted that a cell can evolve and become multicellular. 2
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Plasma Membrane-contains receptors that recognize the egg and protects the sperm‚ controlling what goes in and out. 9. Acrosome- also has outer and inner membrane that surround it‚ forms cap of the sperm‚ and helps penetrating the egg because it’s a lysosome that contains digestive enzymes. 10. Nucleus- contains the DNA 11. Centriole- organizes the axoneme‚ gives rise to the axile filament of the sperm (what it attaches to make the axoneme/flagellum) 12. Mitochondria- powerhouse of the cell‚ provides
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The thyroid gland • • • • • anatomic considerations Formation and secretion of thyroid hormones Transport and metabolism of thyroid hormones Effects of thyroid hormones Regulation of thyroid secretion introduction: the thyroid gland • The thyroid gland maintains the level of metabolism in the tissues that is optimal for their normal function. • Thyroid hormones stimulate the O2 consumption of most of the cells in the body • Thyroid hormones help regulate lipid and carbohydrate metabolism • Thyroid
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1. You are looking at a Euglena using the x10 objective lens. You rotate the nosepiece around to x40 but the specimen is not visible. Describe what you should do next? Start by using the fine adjustment to attempt to focus on the Euglena. However‚ if it is still not visible‚ return to the x10 objective lens and use the fine adjustment to ensure the Euglena is as sharply focused as possible. Then‚ use the stage control to re-position the slide so the Euglena is directly in the centre of the lens.
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Cell Structure & Organelles The cells in a meerkat are eukaryotic because they belong to the Anamalia Kingdom. The five most common organelles found in eukaryotic cells are mitochondria‚ ribosomes‚ nucleus‚ golgi apparatus and lysosome. The mitochondria is an organelle found in the meerkat. Its function is it produces energy out of food consumed. The second organelle is ribosomes‚ which produces protein. The third organelle is the nucleus whose function is the “brains” is
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The Korean Journal of Pathology 2010; 44: 426-30 DOI: 10.4132/KoreanJPathol.2010.44.4.426 Myofibrillar Myopathy - A Case Report - ∙ Jee Young Kim∙ Eun Hae Jeong ∙ Kee Duk Park∙ Heasoo Koo1 Departments of Neurology and 1 Pathology‚ Ewha Medical Research Institute‚ Ewha Womans University School of Medicine‚ Seoul‚ Korea Received : May 25‚ 2009 Accepted : August 18‚ 2009 Corresponding Author Heasoo Koo‚ M.D. Department of Pathology‚ Ewha Womans University School of Medicine‚
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PLASMA MEMBRANE SELECTIVE PERMEABILITY= allowing some substance to cross it more easily than others composed of: Phospholipids Proteins Carbohydrates Cholesterol FLUID MOSAIC MODEL Phospholipids are primary lipids(constantly moving‚ fluidly) AMPHIPATHIC-containing hydrophobic and hydrophilic regions Mosaic part=not made of one thing Freeze-fracture studies:way to view what’s inside FLUIDITY OF MEMBRANE Move within bilayer Most of lipids and some proteins‚ drift laterally
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Crassulacean-Acid metabolism. This type of photosynthesis is most common in desert plants where water is at a premium. In CAM photosynthesis‚ CO2 is taken up only at night and is stored in vacuoles. This causes a buildup of oxaloacetate (acidic) - which we just met in C4 photosynthesis - in those vacuoles. The effect is to partition the initial uptake of CO2 and the rest of the Calvin Cycle over time (as opposed to the partition of these reactions in space that occurs in C4 photosynthesis).
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* Charles Darwin Origin of species by natural selection Theory of natural selection 1. Over production More offspring are produced than can survive 2. Variation There are differences in the traits of these organisms 3. Competition 4. Best adapted survive select agent 5. Reproduce Pass on desirable traits to the next generation Organisms rarely have mutations that can allow the to better adapt to there envirironment. I. Evidence for evolution A. Fossils Remnants of organisms that
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characterized by a lack of a distinct nucleus‚ whereas prokaryotic cells have intracellular compartments bordered by membranes and a well-defined nucleus. ____ 2. Lipids and proteins are the major components of the plasma membrane. ____ 3. Lysosomes remain fully active by maintaining an acid pH created by pumping hydrogen ions into their interiors. ____ 4. The chief function of ribosomes is to provide sites for lipid synthesis. ____ 5. If cells are deprived of communication from extracellular
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