BIOSC 0160 CRN 12336 WHITE Foundations of Biology I Foundations of Biology I Fall Term 2010 Dr Laurel Roberts 1st EXAMINATION Before filling in your name and PeopleSoft ID please check that the color of your scantron sheet matches the color of your test In column J of the scantron sheet blacken the circle corresponding to the color of your exam white 1 blue 2 pink 3 yellow 4 Proceed with the exam choosing the best answer for each of the following questions and blackening the proper circle on the answer sheet with a Number 2 pencil Read each question carefully before marking the best answer on your scantron sheet Work thoughtfully Make educated guesses if necessary Even wild guessing throughout should net you 20 of the total points on the average PLACE THE ANSWER SHEET IN ITS OWN COLOR PILE when you are done 1 When you hold your breath which of the following occurs a carbonic acid formation increases d Both A B X e A B and C b H release increases c lasma pH decreases 2 Consider the bonding of 3 water H2O molecules For every hydrogen bonds there would be covalent bonds a 2 2 b 2 3 c 2 6 X d 3 2 e 3 6 3 Suppose that extraordinary circumstances caused a cell to rapidly digest a large number of macromolecules Which of the following would be true the concentration of lipids would increase the concentration of water within the cell would decrease X d the concentration of proteins would increase e None of the other answers is correct a b c the concentration of water within the cell would increase 4 Based on your knowledge of the polarity of water the solute molecule in this figure is most likely a positively charged d hydrophobic X b negatively charged c neutral in charge e nonpolar 5 A single covalent chemical bond represents the sharing of how many electrons a One b Two X c Three d Four e Six 6 Which of the following is true about aquaporins a b they pump water across the cell membrane they are constructed by the formation of peptide bonds c they are assembled at ribosomes X d Both B and C are true e A B and C are all true WHITE Page 2 7 Dr Roberts loves her coffee What property of water prevents the molecules from leaving the coffee mug as individuals instead of as a stream of rich robust yumminess a adhesion b cohesion X c heat of vaporization d specific heat e humidity 8 The difference between tight junctions desmosomes and gap junctions is that a desmosomes and gap junctions contain keratin whereas tight junctions have collagen b gap junctions and tight junctions have specialized protein channels called connexons desmosomes do not X c tight junctions and desmosomes have mechanical roles whereas gap junctions facilitate communication between cells d desmosomes and gap junctions are found in epithelial tissue whereas tight junctions are found in nerve cells e they all have different functions however their structure is the same 9 When two atoms are equally electronegative they will interact to form a ions d equal numbers of isotopes b polar covalent bonds X c nonpolar covalent bonds e ionic bonds 10 The side chain of Lysine contains an amino group In a folded protein in a cell where would you expect to find lysine In the interior of a cytoplasmic enzyme On the exterior of a protein embedded in a phospholipid bilayer On the exterior of a protein interacting with the cytosol d Both a and b e Both a and c A cellulose bag which is permeable to only water molecules contains a 300 M glucose solution This bag is placed in a 500 mL beaker containing a 150 M solution of NaCl Within this system is the solution of glucose within the bag hypotonic hypertonic or isotonic relative to the solution in the beaker And what is the most likely outcome Hypotonic the bag will shrink and shrivel because the water will flow from the bag into the surrounding NaCl solution Hypertonic the bag will swell and possibly burst because the water will flow into the bag from the NaCl solution X d e There is no way to tell because the system contains two different solutions glucose and NaCl Hypertonic the bag will shrink and shrivel because water will flow from the bag into the surrounding NaCl solution Hypotonic the bag will swell and possibly burst because the water will flow into the bag from the NaCl solution a b X c 11 a b c Page 3 WHITE 12 Which of the following statements is true regarding mitochondria and chloroplasts a Animal cells produce chloroplasts d Chloroplasts can revert to mitochondria in certain conditions e All of the above X b Mitochondria and chloroplasts may be found in the same cell c Mitochondria and chloroplasts are not found in the same cell 13 The enzyme lactase which digests lactose into glucose and galactose is composed of what kind of building blocks a nucleotides b fatty acids X c amino acids d monosaccharides e triacylglycerol 14 After the formation of the peptide bond carbon has bonds while nitrogen has d 3 4 e 4 3 X 15 The roles of biological membranes in eukaryotic cells include which of the functions listed below Separating a cell from its environment d Communicating with adjacent cells X e All of the above Selecting what goes into and out of the cell Maintaining a constant internal environment 16 Active transport usually moves molecules a X b in the same direction as diffusion moves them in the opposite direction in which diffusion moves them c in a direction that tends to bring about equilibrium d toward higher pH e toward higher osmotic potential 17 You re given Compound X and told that it is a macromolecule You discover that it is soluble in gasoline but it is not soluble in water Based on this information what class of biological macromolecules does Compound X belong to a Nucleic acids b Carbohydrates c Proteins d Enzymes X e Lipids a 3 2 b 3 3 c 4 2 a b c WHITE Page 4 18 Because of a chronic disease Sarah has had to take numerous prescription drugs most of her life How would you expect the structures of her liver cells hepatocytes to differ from normal a b increased number of ribosomes on her endoplasmic reticulum increased size of the nuclei d e decreased amount of smooth endoplasmic reticulum decreased number of ribosomes on her endoplasmic reticulum X c increased amount of smooth endoplasmic reticulum 19 Cholesterol molecules act to a help hold a membrane together d disrupt membrane function b transport ions across membranes X e alter the fluidity of the membrane c attach to carbohydrates 20 The elements Ana and Bob form a bond that dissolves when added to water H2O What
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