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: 1864

#Section 2: General Biology

What is the approximate percentage of cases of severe combined immunodeficiency (SCID) due to defects in the Armetis gene?

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#Question id: 1865

#Section 2: General Biology

What deficiency is indicated by poor skin test results to a range of microbial antigens such as tuberculin and mumps?

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#Question id: 1866

#Section 2: General Biology

What does HIV binds to?

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#Question id: 1867

#Section 2: General Biology

Which of the following is a coreceptor for HIV?

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#Question id: 1868

#Section 2: General Biology

Which of the following is NOT helpful in the diagnosis of AIDS?

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#Question id: 1869

#Section 2: General Biology

Which of the following HIV antigens provides a potential target for neutralizing antibody?