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: 670

#XL - Q Biochemistry

The distance along a helix axis for one complete turn is called the ________.

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#Question id: 671

#XL - Q Biochemistry

Which was a major scientific accomplishment by Linus Pauling?

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#Question id: 672

#XL - Q Biochemistry

An ideal α-helix has a pitch of 0.54 nm and a rise of 0.15 nm. What is the length along the helix axis for a segment of an ideal α-helix that contains 30 amino acids?

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#Question id: 674

#XL - Q Biochemistry

Proline is not often found in a-helices of proteins because it

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#Question id: 675

#XL - Q Biochemistry

Which statement is not true about an α-helix?

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#Question id: 676

#XL - Q Biochemistry

What would you expect about the formation of an α-helix for a segment of a protein chain that contains lysine approximately every fourth residue with all other residues being mostly hydrophobic?