Biochemistry Practice Quiz1

Biochemistry Practice Quiz1 - Biochemistry Practice Quiz1...

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Biochemistry Practice Quiz1 BCH4024 This first quiz covers not only material discussed in the first four lectures but also covers important topics (for review purposes) from your courses in general chemistry, biology, organic chemistry, etc, 1. An element which is not thought to be biologically essential in humans is: a. aluminum b. magnesium c. zinc file:///W|/bch4024/examsandquizzes_summer2003.html (47 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html d. potassium e. sulfur f. sodium g. iron 2. There are a number of features of eukaryotic cells and prokaryotic cells that are similar. One distinguishing feature between the two types of cells is that prokaryotic cells, in general, do not have: a. cell walls containing polysaccharides b. a membrane-enclosed nucleus c. ribosomes which serve, in part, as sites for protein synthesis d. storage granules e. defined cell membrane 3. The mitochondria a. do not contain DNA b. do not have ribosomes c. are found in all prokaryotes d. have two distinct membranes e. none of the above 4. Name the following structures: file:///W|/bch4024/examsandquizzes_summer2003.html (48 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html 5. What is the pH of the following solutions? a. 10-4 M HCl b. 10-4 M NaOH c. 10-9 M H2SO4 d. l liter of 0.1 M acetic acid (pK=4.7) to which has been added 75 ml of 1M NaOH e. 1.0 liter of 0.1M glycine hydrochloride (pK values are 2.3 and 9.7) to which has been added 100 ml of 1M NaOH. 6. To a solution of 100 m l of 0.05 M L-alanine hydrochloride (i.e., the totally protonated form) is added 7.0 ml of 1.0 M
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NaOH. What is the final pH value of the new solution? Assume that the pKa values for L-alanine are 2.35 and 9.87 . (Choose the closest value) a. 2.17 b. 2.53 file:///W|/bch4024/examsandquizzes_summer2003.html (49 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html
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Biochemistry Practice Quiz1 - Biochemistry Practice Quiz1...

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