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Assume your TA gives you a bacterial culture and claims there are 4.8 x 107 bacteria/mL in the culture. To check up on her, you prepare serial dilutions of 10-4 – 10-7. You prepare pour plates from each of the dilutions (4 plates in all). a) Draw a dilution scheme […]

1. A scientist discovers a DNA-based test for the allele of a particular gene. This and only this allele, if homozygous, produces an effect that results in death at or about the time of birth. Of the following, which is the best use of this discovery? A) To screen all […]

1) what effect did adding soap to the water have on the surface tension of water? 2) what might be the environmental consequences if a significant amount of surfactant were to get into a pond? 3) Describe any variables in your experiments that you were unable to control and may […]

1) The most superficial layer of skin, made of keratinocytes, is dead and provides a protective barrier. If the keratinocytes were a live at the surface, how could that compromise the protective function of the integument? 2) Electrolysis is the process of hair removal by using electric current. Explain how […]