Which of the following biomes spans the largest annual mean temperature range, but the narrowest mean precipitation range?

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#Question id: 374

#XL - Q Biochemistry

The pH of a sample of blood is 7.4, while gastric juice is pH 1.4.  The blood sample has:

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#Question id: 375

#XL - S Microbiology

The aqueous solution with the lowest pH is:

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#Question id: 376

#XL - S Microbiology

Phosphoric acid is tribasic, with pKa of 2.14, 6.86 and 12.4. The ionic form that predominates at pH 3.2 is

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#Question id: 377

#XL - S Microbiology

The aqueous solution with the highest pH is:

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#Question id: 378

#XL - S Microbiology

Which of the following statements about buffers is true?

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#Question id: 379

#XL - S Microbiology

A compound has a pKa of 7.4. To 100 mL of a 1.0 M solution of this compound at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH: