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: 9264

#XL - R Botany

In a comparison of birds and mammals, the condition of having four limbs is

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#Question id: 9265

#XL - R Botany

To apply parsimony to constructing a phylogenetic tree,

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#Question id: 9266

#XL - R Botany

which similarly inclusive taxon is represented as descending from the same common ancestor as Canidae?

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#Question id: 9267

#XL - S Microbiology

Three living species X, Y, and Z share a common ancestor T, as do extinct species U and V. A grouping that consists of species T, X, Y, and Z (but not U or V) makes up

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#Question id: 9268

#XL - Q Biochemistry

The most active photosynthetic tissue in higher plants is the

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#Question id: 9268

#XL - R Botany

The most active photosynthetic tissue in higher plants is the