Unit 9. Exercise 1. Light Sources and Components – Definitions 1. Forward Biased LED – Semiconductor diode with a positive voltage applied to the p-region and a negative voltage to the n-region. 2. Incoherent Light – Light in which the electric and magnetic fields of photons are completely random in orientation. Incoherent light is typically emitted from light bulbs and LEDs. 3. Laser – Acronym for light amplification by stimulated emission of radiation. The laser produces a coherent source
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Discovering Cells Directions: answer the following questions using complete sentences. Use pages 6C-13C of your textbook. 1. What are cells? 2. When was the first microscope invented? 3. What is a microscope? 4. What is the difference between a simple and compound microscope? 5. Who was one of the first people to observe cells? 6. What did Anton van Leeuwenhoek discover? 7. A Scanning Tunneling Microscope (STM)
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of the Cell Overview: The Importance of Cells • All organisms are made of cells. o Many organisms are single-celled. o Even in multicellular organisms‚ the cell is the basic unit of structure and function. • The cell is the simplest collection of matter that can live. • All cells are related by their descent from earlier cells. Concept 2 Eukaryotic cells have internal membranes that compartmentalize their functions Prokaryotic and eukaryotic cells differ
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Shannon Smith NAME ____________________________________ Felicia Stevenson R E V I E W S H E E T EXERCISE 02/15/2013 LAB TIME/DATE _______________________3/20/2012 32 Print Form Anatomy of Blood Vessels Microscopic Structure of the Blood Vessels 1. Cross-sectional views of an artery and of a vein are shown here. Identify each; and on the lines to the sides‚ note the structural details that enabled you to make these identifications: Artery (vessel type) vein (vessel type)
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We’ve all heard it before‚ "Exercise is good for you because...." Nowadays you can’t check out at the grocery store or do much of anything without being reminded that we mortal humans need to exercise. Still‚ we persist‚ procrastinate and eventually complain that we’re overweight‚ sick‚ dying‚ etc. Listen. Some exercise is better than none‚ more exercise is generally better than less‚ and no exercise can be disastrous. No one is asking for you to start a rigorous daily regimen‚ just do something
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Chapter 7 Study Guide Cell Structure and Function Section 71: Robert Hooke used an early compound microscope to look at a thin slice of cork. It seemed to make tiny empty chambers (cells). Anton van Leeuwenhoek used a singlelens microscope to observe pond water & other things. The microscope revealed a world of tiny living organisms that seemed to be everywhere. Matthias Schleiden concluded that all plants were made up of cells. Theodor Schwann stated that all animals were made up of cells.
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Cell‚ Vol. 116‚ 281–297‚ January 23‚ 2004‚ Copyright 2004 by Cell Press MicroRNAs: Genomics‚ Biogenesis‚ Mechanism‚ and Function David P. Bartel1‚2‚* 1 Whitehead Institute for Biomedical Research 9 Cambridge Center Cambridge‚ Massachusetts 02142 2 Department of Biology Massachusetts Institute of Technology Cambridge‚ Massachusetts 02139 MicroRNAs (miRNAs) are endogenous 22فnt RNAs that can play important regulatory roles in animals and plants by targeting mRNAs for cleavage
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Review Sheet Results 1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. Your answer: If the extracellular K+ increases then the concentration of intracellular K+ will decrease causing a decrease in the steepness of the concentration gradient and fewer K+ ions would be drawn out. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare
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Unit 2 Exercise 1 It is not necessary to put a DNS server in such a small location. 5 users and slow network connectivity does not justify the expense of installing Servers in that location. Unless there is a large amount of File sharing‚ or other data that needs to be accessed daily by other locations on the network. If that is the case then yes put in the server but configure it as a secondary or ADI zone type. I suggest putting the servers in the other location where you have 30 Users and good
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Exercise 23.10 70‚000 80‚000 90‚000 Sales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $1‚400‚000 $1‚600‚000 $1‚800‚000 Cost of goods sold . . . . . . . . . . . . . . . . . . . . .$840‚000 $ 960‚000 $1‚080‚000 Gross profit on sales . . . . . . . . . . . . . . . . . . . $560‚000 $ 640‚000 $ 720‚000 Operating expenses ($90
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