62. Polar molecules cannot easily pass through the cell membrane, but hydrophobic molecules can easily pass through the membrane. The two molecules shown in the diagram both have effects that include raising blood pressure. Comparing two molecules to the right, which statement is TRUE? Ephedrine A) Ephedrine can more easily pass through the cell membrane than epinephrine B) Epinephrine can more easily pass through the cell membrane than ephedrine C) Both epinephrine and ephedrine can pass through the cell membrane equally well. D) Neither epinephrine nor ephedrine can pass through the cell membrane. E) None of the statements is true. 63. According to the Henderson-Hasselbalch equation, when is the pH equal to the pK;? A) when the concentration of acid is close to zero B) when the pH approaches 7 C) when the concentration of the conjugate base is equal to the ionization constant for water D) when the concentration of the conjugate base is equal to the concentration of the acid E) None of the answers is correct 64. If a person is suffering from acidosis, which treatment/action would NOT be a wise choice? A) intravenous administration of bicarbonate B) hyperventilating C) breathing into a paper bag D) vigorous exercise E) All of these treatments/actions could be used to counteract acidosis. 65. Biological buffering systems include: A) histidine B) bicarbonate C) phosphate D) bicarbonate and phosphate E) histidine, bicarbonate, and phosphate. 66. Of the seven the steps listed below, which four-in the CORRECT order-are needed to prepare 1 L of a 0.02M Tris buffer solution, pH 7.6? You have at your lab station a 0.1 M solution of Tris in its protonated form, 0.1 M solutions or HCI and NaOH, and plentiful distilled water. The K. of Tris is 8.32 10 1. 2. 3. Calculate the volume of 0.1 M Tris to use (CV₁-C₂V₂) Calculate the volume of 0.1 M HCI to use (C-V₁-CV₂) Calculate the volume of 0.1 M NaOH to use (CV-C₂V₂) Use the Henderson-Hasselbalch equation to calculate the ratio of Tris base to protonated Tris 5. Adjust the pH to 7.6 by adding 0.1 M NaOH. Adjust the pH to 7.6 by adding 0.1 M HCL Fill to 1 L with distilled water. 7. A) 1467 B) 1457 C) 1247 D) 1347 E) 1746
62. Polar molecules cannot easily pass through the cell membrane, but hydrophobic molecules can easily pass through the membrane. The two molecules shown in the diagram both have effects that include raising blood pressure. Comparing two molecules to the right, which statement is TRUE? Ephedrine A) Ephedrine can more easily pass through the cell membrane than epinephrine B) Epinephrine can more easily pass through the cell membrane than ephedrine C) Both epinephrine and ephedrine can pass through the cell membrane equally well. D) Neither epinephrine nor ephedrine can pass through the cell membrane. E) None of the statements is true. 63. According to the Henderson-Hasselbalch equation, when is the pH equal to the pK;? A) when the concentration of acid is close to zero B) when the pH approaches 7 C) when the concentration of the conjugate base is equal to the ionization constant for water D) when the concentration of the conjugate base is equal to the concentration of the acid E) None of the answers is correct 64. If a person is suffering from acidosis, which treatment/action would NOT be a wise choice? A) intravenous administration of bicarbonate B) hyperventilating C) breathing into a paper bag D) vigorous exercise E) All of these treatments/actions could be used to counteract acidosis. 65. Biological buffering systems include: A) histidine B) bicarbonate C) phosphate D) bicarbonate and phosphate E) histidine, bicarbonate, and phosphate. 66. Of the seven the steps listed below, which four-in the CORRECT order-are needed to prepare 1 L of a 0.02M Tris buffer solution, pH 7.6? You have at your lab station a 0.1 M solution of Tris in its protonated form, 0.1 M solutions or HCI and NaOH, and plentiful distilled water. The K. of Tris is 8.32 10 1. 2. 3. Calculate the volume of 0.1 M Tris to use (CV₁-C₂V₂) Calculate the volume of 0.1 M HCI to use (C-V₁-CV₂) Calculate the volume of 0.1 M NaOH to use (CV-C₂V₂) Use the Henderson-Hasselbalch equation to calculate the ratio of Tris base to protonated Tris 5. Adjust the pH to 7.6 by adding 0.1 M NaOH. Adjust the pH to 7.6 by adding 0.1 M HCL Fill to 1 L with distilled water. 7. A) 1467 B) 1457 C) 1247 D) 1347 E) 1746
Transcribed Image Text:62. Polar molecules cannot easily pass through the cell membrane, but hydrophobic
molecules can easily pass through the membrane. The two molecules shown in the
diagram both have effects that include raising blood pressure. Comparing two molecules
to the right, which statement is TRUE?
HO
OH
Ephedrine
OH
Epinephrine
HO
A) Ephedrine can more easily pass through the cell membrane than epinephrine.
B) Epinephrine can more easily pass through the cell membrane than ephedrine.
Both epinephrine and ephedrine can pass through the cell membrane equally well.
D) Neither epinephrine nor ephedrine can pass through the cell membrane.
E) None of the statements is true.
C)
63. According to the Henderson-Hasselbalch equation, when is the pH equal to the pk₂?
A) when the concentration of acid is close to zero
B) when the pH approaches 7
C)
when the concentration of the conjugate base is equal to the ionization constant for
water
D) when the concentration of the conjugate base is equal to the concentration of the
acid.
E) None of the answers is correct.
64. If a person is suffering from acidosis, which treatment/action would NOT be a wise
A) intravenous administration of bicarbonate
B) hyperventilating
C) breathing into a paper bag
D) vigorous exercise
E) All of these treatments/actions could be used to counteract acidosis.
65. Biological buffering systems include:
A) histidine.
B) bicarbonate.
C) phosphate.
D) bicarbonate and phosphate.
E) histidine, bicarbonate, and phosphate.
66. Of the seven the steps listed below, which four-in the CORRECT order-are needed
to prepare 1 L of a 0.02M Tris buffer solution, pH 7.6? You have at your lab station a
0.1 M solution of Tris in its protonated form, 0.1 M solutions or HCI and NaOH, and
plentiful distilled water. The Ka of Tris is 8.32 × 10°.
Calculate the volume of 0.1 M Tris to use (C1V₁=C₂V₂)
Calculate the volume of 0.1 M HCI to use (C₁V₁-C₂V₂)
Calculate the volume of 0.1 M NaOH to use (C₁V₁-C₂V₂)
Use the Henderson-Hasselbalch equation to calculate the ratio of Tris base to
protonated Tris
1.
2.
3.
4.
5.
6.
7.
A)
Adjust the pH to 7.6 by adding 0.1 M NaOH.
Adjust the pH to 7.6 by adding 0.1 M HCL
Fill to 1 L with distilled water.
1467
B) 1457
C) 1247
D) 1347
E) 1746
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