Question 1

The ratio of a weak acid and its conjugate base at the point of maximum buffering capacity is

Accepted Answer

A)  1\1 
B)  1\10 
C)  10\1 
D)  no definite ratio is needed 
A)  1\1 
B)  1\10 
C)  10\1 
D)  no definite ratio is needed

Question 2

The ion product constant for water (Kw) is equal to:

Accepted Answer

A)  1014 
B)  107 
C)  100 
D)  10 − 7 
E)  10 − 14 
A)  1014 
B)  107 
C)  100 
D)  10 − 7 
E)  10 − 14

Question 3

In a hydrogen bond

Accepted Answer

A)  three atoms lie in a straight line 
B)  there is stronger bonding than in a covalent bond 
C)  unpaired electrons play no role 
D)  none of the above 
A)  three atoms lie in a straight line 
B)  there is stronger bonding than in a covalent bond 
C)  unpaired electrons play no role 
D)  none of the above

Question 4

Which of the following characteristics makes for a good hydrogen bond acceptor?

Accepted Answer

A)  a high electronegativity 
B)  a nonbonding pair of electrons 
C)  both of these 
D)  neither of these 
A)  a high electronegativity 
B)  a nonbonding pair of electrons 
C)  both of these 
D)  neither of these

Question 5

Which of the following is a correct listing of electronegativity values, from low to high?

Accepted Answer

A)  C, H, O, N 
B)  N, H, O, C 
C)  H, C, N, O 
D)  H, C, O, N 
A)  C, H, O, N 
B)  N, H, O, C 
C)  H, C, N, O 
D)  H, C, O, N

Question 6

Which of the following statements about hydrogen bonds is false?

Accepted Answer

A)  The donor is a hydrogen atom bonded to a less electronegative atom then hydrogen. 
B)  The more linear the bond, the stronger the attraction. 
C)  The acceptor must contain a non-bonded pair of electrons. 
D)  It is a type of non-covalent bond. 
A)  The donor is a hydrogen atom bonded to a less electronegative atom then hydrogen. 
B)  The more linear the bond, the stronger the attraction. 
C)  The acceptor must contain a non-bonded pair of electrons. 
D)  It is a type of non-covalent bond.

Question 7

If the pH of 1 liter of a 1.0 M carbonate buffer is 7.0, what is the molar ratio of H2CO3 to HCO3 − ? (pK = 6.37)

Accepted Answer

A)  0.234 
B)  4.27 
C)  6.37 
D)  7.00 
E)  10.20 
A)  0.234 
B)  4.27 
C)  6.37 
D)  7.00 
E)  10.20

Question 8

The main intracellular buffer system is

Accepted Answer

A)  H3PO4\H2PO4 −  
B)  H2PO4 − \ HPO42 −  
C)  HPO42 − \PO43 −  
D)  H3PO4\PO43 −  
A)  H3PO4\H2PO4 −  
B)  H2PO4 − \ HPO42 −  
C)  HPO42 − \PO43 −  
D)  H3PO4\PO43 −

Question 9

The dissociation constant for an acid is 1 × 10 − 6. What is its pKa?

Accepted Answer

A)  − 6 
B)  6 
C)  0.6 
D)  − 0.6 
A)  − 6 
B)  6 
C)  0.6 
D)  − 0.6

Question 10

Which of the following molecules is polar?

Accepted Answer

A)  CCl4 
B)  CH4 
C)  CO2 
D)  NH3 
E)  None of these molecules is polar. 
A)  CCl4 
B)  CH4 
C)  CO2 
D)  NH3 
E)  None of these molecules is polar.

The ratio of a weak acid and its conjugate base at the point of maximum buffering capacity is

The ion product constant for water (K_w) is equal to:

In a hydrogen bond

Which of the following characteristics makes for a good hydrogen bond acceptor?

Which of the following is a correct listing of electronegativity values, from low to high?

Which of the following statements about hydrogen bonds is false?

If the pH of 1 liter of a 1.0 M carbonate buffer is 7.0, what is the molar ratio of H₂CO₃ to HCO₃⁻? (pK = 6.37)

The main intracellular buffer system is

The dissociation constant for an acid is 1 × 10^{− 6}. What is its pK_a?

Which of the following molecules is polar?

Biochemistry and the Organization of Cells

Amino Acids and Peptides

The Three Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins Enzymes

The Behavior of Proteins Enzymes Mechanisms and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids How Structure Conveys Information

Biosynthesis of Nucleic Acids Replication

Transcription of the Genetic Code the Biosynthesis of Rna

Protein Synthesis Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses Cancer and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism Cellular Signaling

Filters

Exam 2: Water the Solvent for Biochemical Reactions

The ratio of a weak acid and its conjugate base at the point of maximum buffering capacity is

The ion product constant for water (Kw) is equal to:

In a hydrogen bond

Which of the following characteristics makes for a good hydrogen bond acceptor?

Which of the following is a correct listing of electronegativity values, from low to high?

Which of the following statements about hydrogen bonds is false?

If the pH of 1 liter of a 1.0 M carbonate buffer is 7.0, what is the molar ratio of H2CO3 to HCO3 − ? (pK = 6.37)

The main intracellular buffer system is

The dissociation constant for an acid is 1 × 10 − 6. What is its pKa?

Which of the following molecules is polar?

Biochemistry and the Organization of Cells

Amino Acids and Peptides

The Three Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins Enzymes

The Behavior of Proteins Enzymes Mechanisms and Control

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids How Structure Conveys Information

Biosynthesis of Nucleic Acids Replication

Transcription of the Genetic Code the Biosynthesis of Rna

Protein Synthesis Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses Cancer and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism Cellular Signaling

Filters

The ion product constant for water (K_w) is equal to:

If the pH of 1 liter of a 1.0 M carbonate buffer is 7.0, what is the molar ratio of H₂CO₃ to HCO₃⁻? (pK = 6.37)

The dissociation constant for an acid is 1 × 10^{− 6}. What is its pK_a?