Which of the four classes of ATP-powered pumps share overall similarity: several subunits, the same general organization, and a similar function as H+ transporters?

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#Question id: 123

#XL - Q Biochemistry

Which would you expect for the fatty acyl chains of the membrane phospholipids of bacteria grown at low temperature?

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#Question id: 124

#XL - Q Biochemistry

What is the role of cholesterol in animal cell membranes?

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#Question id: 148

#XL - T Zoology

The pKa of a certain weak acid is 4.0. Calculate the ratio of proton acceptor to proton donor at pH 7.0.

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#Question id: 149

#XL - T Zoology

The pKaʹs of the side chain group and the α-carboxyl group of glutamate are 4.1 and 2.1, respectively. Which statement accounts for this difference?

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#Question id: 150

#XL - T Zoology

How do the pKa values of an ionizable side chain compare when the amino acid is free versus when it is in a polypeptide chain?

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#Question id: 151

#XL - T Zoology

The isoelectric point of alanine is pH = 6.15. It is mixed with proline (pHCOOH = 2.0; pHNH2= 10.6), and the mixture is placed in an electric field at pH 6.15. Which statement is true?