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The depth of the hemocytometer sample box is 0.1mm for all questions.
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1. You count 74 cfu on a pour plate. The plate was prepared by spreading 0.2 ml of a 1:10,000 dilution of the original sample. What is the density of the original culture (in cells/ml)?
2. You have a culture of yeast that is at a density of 4.76 x 10^6 cells/ml. You dilute the sample 1:100, and then again 1:100, and finally you dilute the sample an additional 1:3. You add 0.1 ml of the final dilution to a spread plate. Assuming that most of the cells in the original culture were living, how many colony forming units do you expect to count on your plate the next day?
3. What is the average size of a yeast cell?
A 26.0mL sample of phosphoric acid (H3PO4) is neutralized by 32.7mL of 2.46M NaOH. A) Balance the equation: NaOH + H3PO4 ? Na3PO4 + H2O B) What is the molarity of the H3PO4 solution?
q1. in 2009 a german politician proposed that all babies must be genetically fingerprinted at birth. what are the
A drug 2,4-dinitrophenol can get into mitochondria, and carry portons from the intermembrane space, and into the matrix. Determine the effect of DNP on the ATP synthesis in the presence of oxygen?
In general, people with B cell defects acquire numerous bacterial infections, whereas those with T cell defects get viral diseases. Explain why this is so.
Imagine a large island with many clipbirds. On that island, 25% have large beaks, 50% have medium beaks, and 25% have small beaks. Far away.
Tropomyosin is 40 nm in length. Individual troponin molecules are separated by 40 nm as well. Is this a coincidence or is there a logical explanation?
Before bringing a new drug to the marketplace, extensive testing is done on the drug by administering the drug to large numbers of individuals. Explain the importance of the scientific method, sample size, controls and variable in the drug evaluat..
Determine hat will happen to the distribution of estuarine freshwater organisms if the building of a dam upstream reduces the flow of freshwater into the estuary?
an 80-year-old woman was being examined by the hospital er physician to determine the extent of injury. her medical
Lakes would suffer a nutrient depletion in surface layers. Evaluate the sizes of the different digestive organs in the earthworm. Which organ is the main? How does its size make it well suited for its function.
Describe in 1-2 paragraphs Koch's Postulates and briefly summarize his contributions to the field of Microbiology.
Describe a procedure that you would use to localize the protein dynein in tissue sections of esophagus and trachea. Indicate the results that you would expect from such an analysis.
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