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: 189

#XL - T Zoology

Because coenzymes are specific for the chemical groups that they accept and donate, they are referred to as

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#Question id: 5691

#XL - T Zoology

Which of the following most accurately explains the cause for the abnormal numbers of chromosomes during human reproduction that can result in Down syndrome, Turner’s syndrome, or Klinefelter’s syndrome?

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#Question id: 2144

#XL - S Microbiology

The type of membrane transport that uses ion gradients as the energy source is:

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#Question id: 546

#XL - R Botany

Enzymes are potent catalysts because they:

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#Question id: 12754

#XL - S Microbiology

A restriction enzyme cuts 1000bp away from the recognition site the restriction enzyme is most likely to be