exam5spr07form1 - Fifth test FORM 1 page 1...

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Fifth test, FORM 1 page BIO201C/Hon—Janicke—Spring 2007 If you have not already done so, IMMEDIATELY fill in the bubbles on the back of the answer sheet for (1) your name (LAST NAME FIRST) (2) 8-digit person number, (3) seat number (4) FORM 1 (under “GRADE or EDUCATION”) On the front of your scantron on the top line, sign your name and the code word “integrity” Do it now, because when the exam is over, you must stop work when told and will be given no extra time to do ANYTHING. You will be assigned a score of ZERO if you hand in a scantron with no name on it, fail to fill in your form number, use notes of any kind, or copy another student’s work. Other procedural errors in your scantron or in exam rules (such as hats, calculators of your own, cell phones heard or seen, or talking) will result in deduction of 5 points (if cheating is NOT suspected). Be sure erasures are complete. You may ask for a new scantron if you’ve ruined yours. CHOOSE ONE AND ONLY ONE ANSWER PER QUESTION. 1. If a lysosome has a pH two units lower than that of the surrounding cytoplasm, that means that compared to the cytoplasm, the hydrogen ion concentration of the lysosome is A. twice as high B. half as high C. 20 times higher D. 100 times higher E. 20 times lower 2. Above is a standard curve. If an unknown protein sample has an optical density (absorbance) at this wavelength of 0.5, what is its concentration? A. 75 mg/ml B. 95 mg/ml C. 0.26 mg/ml D. 40 mg/ml E. 10 mg/ml 1
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Fifth test, FORM 1 page 3. If the transmittance of a sample is 100%, the absorbance of that sample is: A. 2.0 B. 0.0 C. 1.0 D. 100 E. 0.1 4. How many moles of ascorbic acid are there in 1.0ml of a 10.0M solution of ascorbic acid? A. 10.0 x 10 -3 moles B. 20.0 micromoles C. 200 millimoles D. 10.0 micromoles E. 100 millimoles 5. When using a high numerical aperture objective (like 100x/1.25 NA), opening the iris diaphragm generally increases resolution because: A. The brightness of the specimen is increased B. The NAc is less than that of the objective C. Light rays resulting from high spatial frequency diffraction are collected better D. Incident rays experience less high spatial frequency diffraction E. Only light rays resulting from low spatial frequency diffraction are collected 6. .If a nascent protein does not have an N-terminal hydrophobic ER signal sequence, A. It will not be translated B. It will not bind to the SRP C. Its N-terminal end will be cleaved off by the signal peptidase D. It will become a membrane protein somewhere in the endomembrane system E. It will be secreted from the cell by the default pathway. 7. Ras stimulates cell proliferation when certain signals bind to tyrosine kinase receptors. If Ras becomes mutated so that it brings about cell proliferation in the absence of those signals, A. we say it has become a tumor suppressor gene. B.
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exam5spr07form1 - Fifth test FORM 1 page 1...

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