Bio124__Exams_05

Bio124__Exams_05 - Bio 124 FINAL EXAM Questions 1-25 were...

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Bio 124 FINAL EXAM Spring 2005 Questions 1-25 were by some other author. 26. This type of interaction among atoms makes molecules: A. covalent. B. ionic. C. H-bonding D. hydrophobic. E. antisocial. 27. Peptides are polymers of A. monosaccharides B. amino acids C. nucleotides D. fatty acids 28. This level of protein structural organization play a role in determining it's function a. primary b. secondary c. tertiery d. quaternary e. all of the above 29. Only this mechanism of molecular transport can maintain disparate concentrations of a molecule across a biological membrane. a. simple diffusion b. facilitated diffusion c. active transport d. any of the above e. impossible to have disparate concentrations across a biological membrane. Active transport enables movement of molecules from the low concentration side of a membrane to the high concentration side. All other forms of transport/diffusion will tend to equalize concentrations across a membrane. 30. The molecule below is a a. monosaccharide b. amino acid c. nucleotide d. lipid Each carbon has either a hydroxyl or carbonyl group attached. Also, the stoichiometry is C 3 (H 2 O) 3 , thus a carbohydrate. 31. Oxidation of the carbonyl functional group in the molecule above (or any carbonyl group) would convert it into this type of functional group. A. Hydroxyl. B. Carbonyl. C. Carboxyl. D. Amino. E. Phosphate. 32. When an endergonic reaction come to equilibrium, the concentrations of reactants (R) and products (P) will be a. R < P b. R = P c. R > P 33. Organelles (mitochondria, plastids) that produce ATP by chemiosmosis are constructed
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of 2 layers of bilayer membranes, as opposed to other membrane-bound organelles. These 2 layers of membranes enable A. rapid diffusion of protons in and out of the organelles. B. rapid change in proton concentration between the 2 layers of membranes. C. rapid diffusion of protons out of the organelles. D. rapid transport of protons into the organelles. Because the membranes proscribes a small volume, any increase in H + represents a substantial increase. 34. The structure below has a residue (aka side chain, R-group) that is, under physiological conditions, A. hydrophobic. B. polar but not ionized. C. positively charged. D. negatively charged. E. the structure has no residue. Note that the question refers to the residue only, so that the amino and carboxyl groups of the backbone is not included. The residue contains a hydroxyl group, which lends it polar characteristics but the groups is not ionized under physiological conditions. 35. Various organisms use fermentation to enable this process to occur. A. glycolysis B. Krebs cycle C. ethanol production D. nitrite production E. oxidative phosphorylation Fermentation recycles NADH into NAD + , which is required for glycolysis. 36.
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This note was uploaded on 04/08/2008 for the course BIO 124 taught by Professor Idk during the Fall '05 term at Bradley.

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Bio124__Exams_05 - Bio 124 FINAL EXAM Questions 1-25 were...

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