BIO 198 EXAM 1 PRACTICE QUESTIONS AND CORRECT ANSWERS

How many ml of yeast and water would you need to create a 1/10 dilution? 1 ml of yeast suspension 9 ml of water How many ml of yeast and water would you to create a 1/100 dilution? 1 ml of yeast dilution 9 ml of water How much distilled water was taken in ml in the small beaker from the back counter of the room? 40-50 ml Spectrophotometer measures the concentration of solutions by shining a beam of light at it, the move disolved or suspended (yeast) material the solution contains, the more the light will be blocked or absorbed Absorbance measures the amount of light captured by the dissolved or suspended material. TRUE OR FALSE: Absorbance is NOT directly proportional to the amount of dissolved or suspended material in a solution. False, Absorbance is directly proportional to the amount of dissolved or suspended material in a solution What are the relevent parts of the compound light microscope? Eye piece, fixed stage, objectives, and condenser What is the range of magnitudes for the compound microscope starting with the lowest to the highest? 4X, 10X, 20X, 40X True or False: A reasearch team might measure absorbance of different known concentrations of bateria in urine. Using their results, other labs or physiccians could then simply measure absorbance from a patients urine same and use the standard graph to determine the number of bacterial yeast cells present. TRUE Biology Scientic study of life Science a way of asking and answering questions about the physical universe. Its based on inquiry and data Theory well confirmed answer/prediction/explanation of nature. 1. broad in scope 2. supported by a large body of evidence 3 general enought to generate new hypotheses