1. Which of the following statements about water is incorrect? A. It is distributed between intracellular and extracellular compartments. B. It provides a medium for movement of molecules into and throughout cellular compartments. C. It responds to the input of heat by increasing the extent of hydrogen bonding and to cooling by decreasing the bonding between water molecules. D. To achieve equal osmolality on both sides of the membrane, water moves from a compartment with a low concentration of solutes to one with a higher concentration. 2. Which of the following statements about buffer is incorrect? A. Buffers consist of a weak acid and its conjugate base. B. Cause a solution to resist changes in pH when hydrogen ions or hydroxide ions are added. C. The closer the pH of the buffer to the pka of the weak acid, the lesser the buffer capacity. D. The greater the concentration of the weak acid and its conjugate base, the greater the buffer capacity. 3. Phosphate is one of the major buffer systems in the blood. Phosphate has the following pk|values for the dissociation of each of its three protons: pki = 2.1, pK2 = 7.1, and pki = 12.7. Its buffering ability is lowest at which of the following pH values? A. 7.0 B. 7.3 C. 12.6 D. 4.3
1. Which of the following statements about water is incorrect? A. It is distributed between intracellular and extracellular compartments. B. It provides a medium for movement of molecules into and throughout cellular compartments. C. It responds to the input of heat by increasing the extent of hydrogen bonding and to cooling by decreasing the bonding between water molecules. D. To achieve equal osmolality on both sides of the membrane, water moves from a compartment with a low concentration of solutes to one with a higher concentration. 2. Which of the following statements about buffer is incorrect? A. Buffers consist of a weak acid and its conjugate base. B. Cause a solution to resist changes in pH when hydrogen ions or hydroxide ions are added. C. The closer the pH of the buffer to the pka of the weak acid, the lesser the buffer capacity. D. The greater the concentration of the weak acid and its conjugate base, the greater the buffer capacity. 3. Phosphate is one of the major buffer systems in the blood. Phosphate has the following pk|values for the dissociation of each of its three protons: pki = 2.1, pK2 = 7.1, and pki = 12.7. Its buffering ability is lowest at which of the following pH values? A. 7.0 B. 7.3 C. 12.6 D. 4.3
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. Which of the following statements about water is incorrect?
A. It is distributed between intracellular and extracellular compartments.
B. It provides a medium for movement of molecules into and throughout cellular
compartments.
C. It responds to the input of heat by increasing the extent of hydrogen bonding and to
cooling by decreasing the bonding between water molecules.
D. To achieve equal osmolality on both sides of the membrane, water moves from a
compartment with a low concentration of solutes to one with a higher concentration.
2. Which of the following statements about buffer is incorrect?
A. Buffers consist of a weak acid and its conjugate base.
B. Cause a solution to resist changes in pH when hydrogen ions or hydroxide ions are
added.
C. The closer the pH of the buffer to the pKa of the weak acid, the lesser the buffer
capacity.
D. The greater the concentration of the weak acid and its conjugate base, the greater the
buffer capacity.
3. Phosphate is one of the major buffer systems in the blood. Phosphate has the following pk| values
for the dissociation of each of its three protons: pK1 = 2.1, pK2 = 7.1, and pK = 12.7. Its buffering
ability is lowest at which of the following pH values?
A. 7.0
В. 7.3
C. 12.6
D. 4.3
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