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TLS Online TPP Program

#Question id: 2242

What two features of the structure of cholesterol make it somewhat amphipathic?

#XL - Q Biochemistry

  1. The single hydroxyl along with the hydrocarbon nature of the remainder of the molecule

  2. The long, branched hydrocarbon along with the four hydrocarbon rings

  3. The five methyl groups along with the hydrocarbon chain

  4. The three six-membered rings along with the single five-membered ring

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TLS Online TPP Program

#Question id: 361

#XL - S Microbiology

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.
TLS Online TPP Program

#Question id: 361

#XL - Q Biochemistry

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.
TLS Online TPP Program

#Question id: 362

#XL - S Microbiology

A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?
TLS Online TPP Program

#Question id: 362

#XL - Q Biochemistry

A 0.01 M solution of a substance has a pH of 2. What can you conclude about this substance?
TLS Online TPP Program

#Question id: 363

#XL - S Microbiology

What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? If 1.0 mL of 10.0 M NaOH is added to a liter of the buffer prepared, how much will the pH change? (pKa = 6.86)
TLS Online TPP Program

#Question id: 363

#XL - Q Biochemistry

What is the pH of a mixture of 0.042 M NaH2PO4 and 0.058 M Na2HPO4? If 1.0 mL of 10.0 M NaOH is added to a liter of the buffer prepared, how much will the pH change? (pKa = 6.86)