562quizzes

Name: ________________________

Chemistry 562/762

Quiz 1

1. List two properties of a water molecule and explain how that property is beneficial to the existence of life-forms. (4 points)

2. What is the pH of buffer solution containing 0.1 M butryric acid and 0.08 M sodium butyrate? The pKa of butyric acid is 4.81. (6 points)

Quiz 2

1. Draw the structure of the amino acid lysine. (3 points)

2. Draw the structure of a (1) nonpolar amino acid and (2) an aromatic amino acid. Include the three-letter abbreviation to indicate which amino acid you have drawn. (6 points)

3. Which amino acid is not optically active? (1 point)

Quiz 3

1. At pH 7.4, what would the net charge be on the following peptide? (3 points)
Ala-Gly-Leu-Phe-Lys-Arg-Pro-Leu-Arg

2. Draw the structure of the dipeptide valylserine. (5 points)

3. How many amino acids are in a tetrapeptide? (2 points)

Quiz 4

1. Complete the following partial purification table. (4 points)

Sample	Total protein	Units activity	Specific Activity	Yield	Fold Purification
A. Crude cell extract	10,000 mg	100 U
B. Lectin affinity chromatography	300 mg	57 U

2. List three of the techniques used to purify proteins. In a sentence or two, explain the principle by which separation occurs. (6 points)

Quiz 5

1. Diagram an alpha helix, indicating important dimensions and forces which are responsible for the stability of this type of secondary structure. (4 points)

2. List three of the commonly observed tertiary structures. (6 points)

Quiz 6

1. Explain the following terms. (6 points)
    A. Active Site
    B. Coenzyme
    C. Holoenzyme

2. List the 6 classes of enzymes by their enzyme commission numbers. (4 points)

Quiz 7

1. Write the formula for the Michaelis-Menton equation and define what the terms are. (6 points)

2. In addition to the factors in the Michaelis-Menton equation which affect the rate of an enzyme-catalyzed reaction, what are two other things discussed so far that will influence reaction rate? (4 points)

Quiz 8

1. What coenzyme would you expect to be used in the following reaction? Give the name and take a stab at the structure. (3 points)

2. List on of the means by which an enzyme functions to catalyze a reaction and give an explanation for how it works. (4 points)

3. What type of inhibition is shown in the following Lineweaver-Burk plot? (3 points)

Quiz 9

1. Draw the structure of ß-D-Galactose. (5 points)

2. What is the name of this monosaccharide? (2 points)

3. Is the following monosaccharide a D sugar or an L sugar? (3 points)

Quiz 10

1. Methylation and acid hydrolysis, followed by chromatographic identification of monosaccharide products, yielded the following structures in a ratio of 20:20:1:1. Indicate a plausible structure of the polysaccharide. (10 points)

Quiz 11

1. Draw the structure of a phospholipid composed of choline, stearic acid and arachidonic acid. (5 points)

2. Indicate the structures of the products if the following triacylglycerol is saponified. (5 points)

Quiz 12

1. Identify as best you can the following molecule. (2 points)

2. Indicate the types of transport across a plasma membrane and a brief statement of what makes each type of transport unique. (5 points)

3. What are the properties of the bases that make up nucleic acids. (3 points)