Biology 12 - The Cell Part A: In ONE sentence‚ in the space provided‚ describe the function of the following organelles. Use point form. Use your own words. Paraphrase and condense the textbook definitions. DO NOT copy any definition or part of a definition. In the box to the left of each definition‚ make a sketch of the organelle. |SEE NOTES |1. cell membrane: control what goes in and out of cell‚ forms barrier with outside environment |
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: -Device used to overcome the limitation of sight. -Device used to overcome the limitation of hearing. Device used to overcome the limitation of sight. (Microscope) [pic] Instrument to magnify object such as virus Objective lens and eyepiece magnifying image Types: light microscope‚ electron microscope (Magnifying glass) [pic] Limited magnifying power-10 to 15 times Use to see small objects Magnifying glass is convex lens (Telescope)
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INTRODUCTION Defects of Hearing •Hearing defects means ear is not working correctly or as well as it should. •It may occur in more than one part of the ear. •1. DEAF-full or partial decrease in the ability to detect or understand sounds. Deaf usually caused by : - Eardrum is torn-cannot function - Ossicle bone fused together-can’t vibrate - Auditory nerve damaged by loud sound - Cochlea damage due to sickness/ drugs •2. Temporary hearing loss-build-up of earwax •3. Presbycusis- hearing loss
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Samples were submitted to negative staining with uranyl acetate and observed with a Jeol JEM 1400 transmission electron microscope‚ equipped with a CCD Gatan ES1000W Erlangshen
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Chapter 4 Microscopes Two important factors in microscopy are: 1) Magnification: an increase in the object’s apparent size compared with its actual size. 2) Resolving Power: the ability of an optical instrument to show two objects are separate. Three types of microscopes: 1) Light Microscope (LM) M: 1000x RP 0‚2 micrometer (small bacterial cell) 2) Electron Microscope (EM) uses a beam of electrons to resolve electrons‚ better resolving powers than light microscope M:100‚000x RP 0
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resolution of 4 cm-1. Surface topography analysis: The surface topography of the bilayered scaffolds was analyzed using environmental scanning electron microscope (ESEM‚ FEI Quanta 200‚ Netherlands). The scaffolds were fixed on aluminium stubs and the images were acquired at different magnifications. The fiber diameter distribution was quantitatively analyzed from scanning electron micrographs using Image J
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atmosphere furnace for one hour at 500° C. The crystalline structure of ZnO thin films thus prepared was characterized via the XRD technique with a PanAlytical diffractometer. The chemical composition of the films was examined using EDS with a scanning electron microscope (SEM‚ Quanta 2000). The surface morphology of the films was examined in contact mode by Nanosurf easyScan 2. The optical transmittance spectra were collected at room temperature by a Safas UVmc2 UV-Vis. spectrophotometer and the photoluminescence
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Arlen Kong October 11‚ 2010 Chapter 6.1‚ 6.2‚ 6.3 – Online Activities Online Activity 6.2-Membranes Organize a Cell’s Activity Dissect a Plasma Membrane Objective: to understand the structure of a membrane 1. Why is the membrane described as a phospholipid bilayer? It is described as a phospholipid bilayer because there are two layers of phospholipid molecules. 2. How does the arrangement of the phospholipids form a bilayer? The phospholipids arranged in two layers so that the
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People used the materials in the nanometer dimension for various purposes‚ however they thought these particles as metallic colloids‚ having the properties and behavior of the other colloids such as milk in water. Transmission EM Scanning EM Atomic Force Microscope Super-coiled DNA Quantum corrals showing the de-Broglie hypothesis of wave-particle duality Writing at the Nanoscale using AFM: Dip-Pen Nanolithography How Nanoparticles are different from Bulk Materials • Nanoparticles
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BIOLOGY 1406 REVIEW FOR EXAM II Chapter 6: A Tour of the Cell I. The microscope A. Differences between light microscope‚ scanning and transmission electron microscope B. Relationship between magnification‚ resolution and contrast II. Compare and contrast prokaryotic and eukaryotic cells III. Know parts of the cells‚ their structure and function A. The nucleus B. Ribosomes C. Endomembrane system 1. Nuclear envelope 2. Endoplasmic reticulum (ER) a. Rough ER-has
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