Question 1

Which of the following would likely form micelles in an aqueous solution?

Accepted Answer

A) hexane 
B) glucose 
C) glutamic acid 
D) dodecanoic acid 
E) none of the above

Question 2

Lysine contains two amine groups (pKa values of 9.0 and 10.0)and a carboxylic acid group (pKa 2.2).In a solution of pH 9.5,which of the following would best describe the protonation and charge state of lysine?

Accepted Answer

A) carboxylic acid: deprotonated and neutral;both amines: protonated and positive 
B) carboxylic acid: deprotonated and negative;both amines: deprotonated and neutral 
C) carboxylic acid: deprotonated and negative;amine (pKa 9.0): deprotonated and neutral;amine (pKa 10.0): protonated and positive 
D) carboxylic acid: deprotonated and negative;amine (pKa 9.0): protonated and positive;amine (pKa 10.0): deprotonated and neutral 
E) carboxylic acid: deprotonated and neutral;amine (pKa 9.0): deprotonated and neutral;amine (pKa 10.0): protonated and positive

Question 3

Formic acid is the active agent in an ant bite.What is the ratio of base/acid for formic acid (pKa 3.9)in the blood stream at pH 7.4?

Accepted Answer

A) 3.16 $\times$ 10-4 
B) 3.16 $\times$ 103 
C) 3.5 
D) 0.54 
E) 1.90

Question 4

Which of the following represents the breaking of a noncovalent interaction?

Accepted Answer

A) hydrolysis of an ester 
B) dissolving of salt crystals 
C) ionization of water 
D) decomposition of hydrogen peroxide 
E) none of the above

Exam 2: The Matrix of Life: Weak Interactions in an Aqueous Environment

Which of the following would likely form micelles in an aqueous solution?

Lysine contains two amine groups (pK_a values of 9.0 and 10.0) and a carboxylic acid group (pK_a 2.2) .In a solution of pH 9.5,which of the following would best describe the protonation and charge state of lysine?

Formic acid is the active agent in an ant bite.What is the ratio of base/acid for formic acid (pK_a 3.9) in the blood stream at pH 7.4?

Which of the following represents the breaking of a noncovalent interaction?

Exam 2: The Matrix of Life: Weak Interactions in an Aqueous Environment

Which of the following would likely form micelles in an aqueous solution?

Lysine contains two amine groups (pKa values of 9.0 and 10.0) and a carboxylic acid group (pKa 2.2) .In a solution of pH 9.5,which of the following would best describe the protonation and charge state of lysine?

Formic acid is the active agent in an ant bite.What is the ratio of base/acid for formic acid (pKa 3.9) in the blood stream at pH 7.4?

Which of the following represents the breaking of a noncovalent interaction?

Lysine contains two amine groups (pK_a values of 9.0 and 10.0) and a carboxylic acid group (pK_a 2.2) .In a solution of pH 9.5,which of the following would best describe the protonation and charge state of lysine?

Formic acid is the active agent in an ant bite.What is the ratio of base/acid for formic acid (pK_a 3.9) in the blood stream at pH 7.4?