Sample Questions - CELL BIOLOGY (BIO 320) FALL 2009 Sample...

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CELL BIOLOGY (BIO 320) FALL 2009 Sample questions for quizzes and exams ____________________________________________________________________ ____ 1. (i) The endosymbiotic theory suggests that some cell organelles may have arisen when a procaryotic cell was taken up (phagocytosed) by a primitive eucaryotic cell but not digested. A symbiotic relationship arose between the two cells since such cells had a selective advantage, and the cells became extremely successful giving rise to modern eucaryotic cells. Name any one feature of such organelles that may be a holdover from their origin. (ii) What organelles in eucaryotic cells might have arisen in this way? 2. (i) What is horizontal gene transfer? (ii) Which group of organisms (procaryotes or eucaryotes) do you expect horizontal gene transfer to be more prevalent in? 3. Why are genes that are involved in informational activities, like transcription, translation and replication, the best subjects for determining phylogenetic relationships? 1
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Availability of complete genome sequences for organisms belonging to all three domains of life has influenced most areas of biological research. A ccording to you what has been the most significant outcome of this information in our understanding of living organisms? 5. Describe the types of bonds/interactions that hold together or stabilize the primary, secondary, tertiary, and quaternary structures of proteins. 6. (i) Where would you expect to find phenylalanine residues in a folded protein? (In the interior or on the surface of the protein?) (ii) What amino acid residues (hydrophilic or hydrophobic) would you expect to find in the loop regions connecting different α helices? 7. Chymotrypsin belongs to a group of proteolytic enzymes called the “serine proteases,” many of which have an aspartic acid, histidine, and serine residues that are crucial to the catalytic mechanism. The hydroxyl group of serine functions as a nucleophile in the catalytic reaction. What is the function of the other two amino acids in this reaction? 2
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Sample Questions - CELL BIOLOGY (BIO 320) FALL 2009 Sample...

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