Calculate the percentage of histidine that has its imidazole side chain protonated at pH 7.3. The pKa values for histidine are pK1 = 1.8, pK2 (imidazole) = 6.0, and pK3 = 9.2.

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#Question id: 2049

#XL - S Microbiology

Which of the following statements is TRUE of immune responses?

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#Question id: 2050

#XL - S Microbiology

Which of the following statements is NOT TRUE?

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#Question id: 2051

#XL - S Microbiology

In a thymectomized animal, which of the following is irradiated and reconstituted with bone marrow cells?

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#Question id: 2052

#XL - S Microbiology

Why have pigs have been proposed as a source of organs for xenotransplantation to humans?

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#Question id: 2053

#XL - S Microbiology

The single best chance of a tissue graft being accepted in a human recipient is if it is:

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#Question id: 2054

#XL - S Microbiology

What is the single best defining feature of systemic lupus erythematosus (SLE)?