MCB3209%20Exam%201-print

MCB3209%20Exam%201-print - MCB 32 Exam#1 Answer questions...

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1 MCB 32 Exam #1 9/29/09 Answer questions on the Scantron form using a #2 pencil. WRITE YOUR NAME AND SID NUMBER ON THE SCANTRON FORM, INCLUDING BUBBLING IN THE CORRECT SPACES FOR SID. Mark T-F questions A = T, B = F T-F, matching and identify questions = 1 pt, Multiple choice = 2 pts Feedback Regulation + Homeostasis 1. T-F? Negative feedback response is one in which an increase in sweating (loss of body water) leads to increased water retention by the kidneys. 2. Interstitial fluid and intracellular fluid A. have approximately the same concentrations of Na, Cl and K B. are electroneutral fluids (have equal concentrations of anions and cations) C. comprise the internal environment 3. T-F? CO 2 and O 2 are both polar molecules that require specialized proteins in the membranes for entry into and exit from red blood cells. Molecules 4. Which of the molecules drawn below is a lipid? A. B. C. D . E.
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2 5. T-F? A person who holds his breath retains excess CO 2 . This results in an elevated blood pH. 6. T-F? A solution with pH 6.0 is more acidic than one with pH 7.4. 7. T-F? A one molar solution of CaCl 2 has the same number of osmotically active solute molecules as a 3 molar solution of glucose. 8. Lipids A. are hydrophobic molecules B. can be used in the body for insulation and energy storage. C. are formed by dehydration synthesis D. all of the above E. none of the above 9. Hydrogen bonds A. determine the pH of solutions B. bind different portions of proteins into the secondary structure C. are important determinants of the double helix structure of DNA D. B and C are correct, but not A. E. A, B and C are all correct. 10. If four bases in a DNA strand are A, G, C, T, the complementary bases in the opposite strand of DNA are ____, while the complementary bases on an mRNA strand will be ____. A. A, G, C, T and U, G, C, A B. U, C, G, A and T, C, G, A C. T, C, G, A and U, C, G, A D. A, G, C, T and U, C, G, A Organelles + Protein Synthesis 11. T-F? Membrane lipids and cholesterol are held in place by cytoskeletal proteins like actin. 12. The listed events all occur during the synthesis of proteins for export. List them in the proper order: i. Protein folds in the ER ii. mRNA synthesized iii. DNA unwinds iv. tRNA binds to mRNA A. i > ii > iii > iv B. ii > i > iii > iv C. iii > ii > i > iv D. iii > ii > iv > i 13. T-F? A gene with 3600 bases will encode a protein with 10800 amino acids. 14. T-F? Humans have more than 250,000 genes encoded in their DNA. 15. T-F? Cell membranes are 100 nm (100x10 -9 m) thick; mitochondria are 10 µ m (10x10 -6 m) long; and intestinal epithelial cells are 100 µ m (100x10 -6 m) in diameter.
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3 16. Protein that are used in the cytosol are produced on ___ in the cytosol while proteins that are used in either the plasma membrane or are secreted to the extracellular space are produced in the ____. A.
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This note was uploaded on 09/21/2010 for the course MCB 57703 taught by Professor Machen during the Spring '08 term at Berkeley.

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MCB3209%20Exam%201-print - MCB 32 Exam#1 Answer questions...

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