By Leslie P. Gartner, James L. Hiatt, Judy M. Strum
BRS mobile Biology and Histology is an outline-format overview for USMLE and path tests, with considerable electron micrographs and conceptual line drawings, high-yield medical issues bins, evaluation questions on the finish of every bankruptcy, and a accomplished USMLE-format exam on the finish of the publication. This 6th variation good points 60 new full-color photomicrographs and a brand new full-color layout with colorized line drawings. content material and questions were up to date, new scientific issues were extra, and scientific issues were higher built-in into the content material. A better half web site will provide the totally searchable textual content and an interactive query financial institution.
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Extra info for BRS Cell Biology & Histology, 6th Edition
Qxd 05/31/2010 10:18 AM Page 18 Aptara 18 BRS Cell Biology and Histology 1. Heterochromatin, condensed inactive chromatin, is concentrated at the periphery of the nucleus and around the nucleolus and scattered throughout the nucleoplasm. a. When examined under the light microscope (LM), it appears as basophilic clumps of nucleoprotein. b. Although heterochromatin is transcriptionally inactive, recent evidence indicates that it plays a role in interchromosomal interactions and chromosomal segregation during meiosis.
Glycogen serves as a stored energy source that can be degraded to glucose, which enters the bloodstream to elevate blood sugar levels. 2. Lipid droplets vary markedly in size and appearance depending on the method of fixation, and they are not bound by a membrane. Lipid droplets are storage forms of triglycerides (an energy source) and cholesterol (used in the synthesis of steroids and membranes). 3. Lipofuscin appears as membrane-bound, electron-dense granular material varying greatly in size and often containing lipid droplets.
Peroxisomes contain various enzymes whose functions vary from the oxidation of long-chain fatty acids to the synthesis of cholesterol to the detoxification of substances such as ethanol. CLINICAL CONSIDERATIONS Peroxisomal diseases 1. Zellweger syndrome is a genetic disease in which normal peroxisomes are absent. Infants with this syndrome have profound neurological disorders and liver and kidney problems and usually die within a few months. Electron micrographs of biopsies from these patients reveal empty peroxisomes, lacking enzymes.