Biology 141 Lab Midterm Review

Biology 141 Lab Midterm Review - Biology 141 Lab Midterm...

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Biology 141 Lab Midterm Review Positive and Negative Controls Both positive and negative controls have known results. Controls are determined by either applying or not applying the independent variable. For example, an experiment involves a magnet, a piece of iron, and a piece of paper. o The positive control would be the iron, which tests to make sure the magnet is working. o The negative control is the paper. Which tests to make sure the I.V. (Magnetism) isn’t taken away. Another example, in gram staining: o The independent variable is gram stain or no stain. o The positive controls would be either a purple or a pink stain. o The negative control would be unstained bacteria (which tests to make sure the bacteria is good to start with). In pH: o The negative control would be a pH of 7, which is unaltered. o The positive control would be any alteration of the pH. Things to know If something is soluble it is in the cytoplasm of a cell. If something is found in a membrane that means it is hydrophobic.
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This note was uploaded on 10/17/2011 for the course BIO 141 taught by Professor Dr.cafferty during the Fall '11 term at Emory.

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Biology 141 Lab Midterm Review - Biology 141 Lab Midterm...

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