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Assume you were given fifty ml of sewage and asked to determine the number of bacteria in the sample. You began by taking 5 ml and putting it into 45 ml of sterile water. From this mixture, you took 1 ml and put it into 99 ml of sterile water. From the previous mixture, you took 10 ml and put it into 10 ml of sterile water. From the previous mixture, you took 1 ml and put it into 9 ml of sterile water. From the previous mixture, you took 5 ml and put it into 45 ml of sterile water. Then, you plated 0.2 ml of the final solution, 0.1 ml and 0.01 ml, all in triplicate. The plates inoculated with 0.2 ml and 0.1 ml of the solution had TNTC (too numerous to count) and the 0.01 ml plating generated 51, 49 and 32 colonies.
a. What is the final fold-dilution for the diluted solution used for plating?
b. What are the bacterial counts per ml of original sample?
c. What are the total bacteria counts in the original sample?
A man with hemophilia marries a woman whose family has no record of hemophilia. Their first child is a son. The couple is worried that their son may have inherited hemophilia. What are the chances of a hemophilic son.
Use the protein Dynorphin as an example, Explain the cellular production process for creating and secreting of this protein for use in the body.
If all other variables remain constant, when 2-action potentials enter synaptic terminal and produce pair of EPSPs in the muscle fiber, larger EPSP is produce by the secretion of:
Discuss similarities and differences between starch and cellulose in sugar type, glycosidic linkage type, three dimensional structure, solubility and function.
Though plants, fungi, and prokaryotes all have cell walls, we classify them under different taxonomic units. Which of the observations below comes closest to explaining the basis for placing these organisms in different taxa.
Will victim die, or would the scientist have to go back to the laboratory to invent a more effective death-ray. The DNA is consequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s).
What series could you use to make a beta barrel with twelve antiparallel strands? Write out one repeat of the sequence as follows: M-(your sequence) 12.
If you place some delicious berries in a closed container in a pen one hectare in size and place a bear in the pen, bears will find those berries in an average of thirty minutes and twenty seconds,
give Name the three major components of a homeostatic control system and tell briefly the function of each component.
Both endocrine and nervous system are major regulating systems of the body; however, the nervous system has been compared to any post mail delivery system and the endocrine system to the pony express. In brief explain this comparison.
How might the initial reaction occur in this pathway. as lactate is a "dead end" product of metabolism in the sense that its sole fate is to be converted into pyruvate, what is the purpose of its formation.
Suppose that you measure the OD of two E.coli cultures: culture A and culture B. The spectrophotometer gives you a reading of 2.2 for culture A and 0.02 for culture B.
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