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: 8896

#SCPH28 | Zoology

Chordate pharyngeal slits appear to have functioned first as

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#Question id: 8897

#SCPH06 I Botany

Which of the following statements would be least acceptable to most zoologists?

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#Question id: 8897

#SCPH28 | Zoology

Which of the following statements would be least acceptable to most zoologists?

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#Question id: 8898

#SCPH06 I Botany

Which extant chordates are postulated to be most like the earliest chordates in appearance?

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#Question id: 8898

#SCPH28 | Zoology

Which extant chordates are postulated to be most like the earliest chordates in appearance?

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#Question id: 8899

#SCPH06 I Botany

A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired lateral fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?