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1. Why do Coxiella show variable Gram stain results-that is, why would they stain gram-positive or gram-negative at different times? Tell which stage is G + and which stage is G-, Also, explain if Coxiella should be classified as gram-positive or gram-negative when classified?
2. What disease does C. burnetii cause? Why can this disease be transmitted by airborne routes while other (closely related) rickettsia species require insects and ticks for transmission to humans? Give an example of a closely related rickettsia species to Coxiella burnetii and tell how it is transmitted.
how The information carried by DNA is incorporated in a code
The wombat is an animal with two possible coat colors, brown or silver. It has been hypothesized that coat color is an x-linked trait. Sex determination in wombats is via a mechanism that is identical to sex determination in humans.
A researcher times rats in running a maze and finds that the average time for all of the rats to complete the maze is 34 seconds. She then breeds only those rats that ran the maze in 25 seconds or less and finds that the rats in generation two com..
The state of an unspecified system at constant pressure is changed by doing 50 J of work on the system. At the end of the process, the temperature of the system rises by 10 K. What is the heat capacity of the system? Assume that the system does no..
As the polar ice shirinks with rising global temperatures, brown bears are expanding their range into the historical distribution of their close relative, the polar bear. Could this shift be explained by foraging strategy? If so, how?
The gene for absence of eges (a) in fruit flies is recessive to teh gene for normal eyes (A). An eyeless male is crossed witha female who is purebred for normal eyes.
Based on the data, propose a hypothetical biochemical explanation for the colors of the flowers in the F2 progeny. Again, explain your reasoning.
Motor proteins are often described as mechanoenzymes.Why? Could this same term be applied to virtually all enzymes? Why or why not?
Assume you have 5mL of cells you need to treat with Hydrogen Peroxide, such that the final concentration of Hydrogen Peroxide is 5uM. How much of a 10mM stock solution of Hydrogen Peroxide would you add to your cells?
What is the yield of ATP when each of the following substrates is completely oxidized to CO2 by a mammalian cell homogenate.
Blood is pumped at high pressures in arteries from the heart to ensure that all parts of the body receive adequate blood flow. Capillary beds, however, would hemorrhage under direct arterial pressures. How does the design of the circulatory netwo..
In some species, males donate only sperm to the female (i.e., she does not receive a direct benefit). Give an example of this kind of mating system (you may use a particular species or a type of mating system) (1).
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