lecture 22 - BIO 311C March 17, 2008 Your graded Exam 2...

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BIO 311C March 17, 2008 Your graded Exam 2 will be returned to you during discussion periods today and tomorrow. An answer key to the exam will be posted on the course web site on Wed. 19 March. See Jingjie by Fri. 21 March if you believe we have made an error in grading your Exam 2. We will not consider changes after that date. The mean grade on Exam 2 was 76% The standard deviation was 14% The high grade was 100%
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Bulk transport into animal cells occurs in a process called endocytosis. Several different mechanisms of endocytosis are shown. Also see textbook Fig.7.20, p. 138 Phagocytosis is a mechanism of ingestion of solid particulate matter into the cell. Pinocytosis is a mechanism of ingestion of a volume of the extracellular fluid into the cell. Receptor-mediated endocytosis is a mechanism of ingestion whereby binding of a specific molecule or ion in the extracellular fluid to a "receptor" domain on the exterior surface of a transmembrane protein triggers endocytosis. *
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Excretion or Secretion Substances from the Cell From textbook Fig. 6.16, p. 109 Exocytosis Vesicles derived from golgi membranes fuse with the plasma membrane, releasing into the external environment substances that were in the lumen of the vesicle. secretion : export from the cell of substances intended for use elsewhere in the body. excretion : export from the cell of waste products. cytoplasmic matrix of cell extracellular fluid *
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A budding Virus From textbook Fig. 18.8, p. 341 Attachment of virus glycoproteins on the outer surface of the plasma membrane Exocytosis Export of virus, surrounded by a piece of the plasma membrane that contains virus glycoproteins *
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A chemical reaction that takes place within a living organism or within a living cell is called a metabolic reaction . The sum of all chemical reactions that take place within a living organism or within a living cell is called the metabolism of the organism or of the cell. * Definitions: Chemical Reactions in Living Cells
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A chemical reaction might be written very simply as: A B , For the reaction written as: W + X Y + Z , W, X, Y and Z are all substrates, W and X are reactants, Y and Z are products. Metabolic reactions operate under exactly the same set of chemical principles as reactions that take place in a chemistry laboratory.
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lecture 22 - BIO 311C March 17, 2008 Your graded Exam 2...

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