07Fexam1key - Name_KEY_ EID_ CH 339K Exam 1 6 Sept 2007 100...

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Name________________ KEY ________________________ EID__________________________________________ 1 CH 339K Exam 1 6 Sept 2007 100 points total 5 pts. 1 . Which one of the following has the cellular components arranged in order of increasing size? a. Amino acid < protein < mitochondrion < ribosome b. Amino acid < ribosome < protein < mitochondrion c. Amino acid < protein < ribosome < mitochondrion d. Protein < amino acid < mitochondrion < ribosome e. Protein < ribosome < mitochondrion < amino acid 13 pts. 2 . a . A typical bacterial cell has a volume of 4 x 10 -13 cm 3 . Calculate the number of pyruvate kinase enzyme molecules contained in a single bacterium, assuming the intracellular pyruvate kinase concentration is 1 µ M. 1 μ mol L " 1 L 10 3 ml " 1 ml 1 cm 3 " 4 " 10 # 13 cm 3 " 1 mol 10 6 μ mol " 6.02 " 10 23 moleculues mol = 241 molecules 7 pts. b . Is this a reasonable answer, given that a single pyruvate kinase molecule is roughly spherical with a diameter of 100 Å (10 nm)? Show your reasoning. i.e., can 241 pyruvate kinase molecules fit into the volume of this cell? The volume of each enzyme molecule
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07Fexam1key - Name_KEY_ EID_ CH 339K Exam 1 6 Sept 2007 100...

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