BIS002A MT2 S09 Key Comai

BIS002A MT2 S09 Key Comai - BIS2A Midterm 1 Comai Spring...

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BIS2A Midterm 1, Comai, Spring 2009 VERSION B Yeast maintain the concentration of sucrose (a sugar) inside their cells at a steady level, marked here by the dotted line. When cells of yeast are placed in media containing different sucrose concentration, they transport it into the cell at the rate (sucrose/sec) indicated in the graph below. P and M define experimental ranges of sugar concentration outside the cell. 1. In the P concentration range sugar is taken up into the cell because of: a. diffusion b. unsaturated lipid chains c. formation of vesicles d. active transport e. plasmodesmata 2. In the M concentration range sugar is taken up into the cell because of: a. diffusion b. unsaturated lipid chains c. formation of vesicles d. active transport e. plasmodesmata 3. Given the properties of sucrose, the following is expected: a. sucrose will permeate through the lipid bilayer in both ranges b. membrane protein(s) will be involved in both ranges c. a membrane protein will be involved only in range M d. a membrane protein will be involved only in range P e. membrane lipid composition will change in the two ranges ________________________________ - 1 -
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4. Which molecular pair is expected to form a H bond?: molecule I molecule II a R-C=O H3C-R b R-CH2-NH2 H3C-R c R-CH=CH2 HO-CH2-R d R-CH=CH2 H3C-R e R-C=O HO-CH2-R 5. Which atomic bond is expected to have a biased distribution of the electrons involved: bond a C-H b C-C c H-H d O-H e O-O 6. The above cell is most likely that of a _________ because of ______ a. prokaryote, nucloid b. prokaryote, membrane invagination c. prokaryote, lack of flagella d. eukaryote, lack of flagella e. eukaryote, many organelles - 2 -
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7. An acid is best defined by its ability to:
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BIS002A MT2 S09 Key Comai - BIS2A Midterm 1 Comai Spring...

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