MCB 150 Practice Exam I Spring 2011 1 Which one of the following statements is not a tenet of the Cell Theory A All organisms are composed of cells B All cells come from preexisting cells C All cells possess DNA as their hereditary material D The cell is the fundamental unit of life E All of the above statements are tenets of the Cell Theory 2 Consider the following reaction and the resulting molecule molecule isomerase diphosphate This reaction would be catalyzed by a n would most accurately be referred to as a A B kinase bisphosphate C kinase diphosphate D flippase dinucleotide E polymerase bisphosphate 3 Which one of the following stabilizing forces is the weakest under normal physiological Ionic bonds conditions Consider individual interactions not the collective stabilizing force of multiple interactions A B Hydrogen bonds C van der Waals forces D Hydrophobic clusters E Disulfide bridges 1 MCB 150 Practice Exam I Spring 2011 4 Phosphodiester linkages are formed between A B a fatty acid carboxyl group and a glycerol hydroxyl group C D E the amino nitrogen of the incoming monomer with the carboxyl carbon of the end of the polymer the 3 hydroxyl group of the incoming monomer with the 5 phosphate group of the end of the polymer the carboxyl carbon of the incoming monomer with the amino nitrogen of the end of the polymer the 5 phosphate group of the incoming monomer with the 3 hydroxyl group of the end of the polymer 5 Which one of the following biological macromolecules is defined more by a physical property than by its structure A Polysaccharides B Proteins C Nucleic acids D Lipids 6 Which one of the following cellular structures or regions is not separated from its immediate surroundings by one or more biological membranes A A ribosome B The nucleolus C A chloroplast D A and B E B and C 2 MCB 150 Practice Exam I Spring 2011 7 Which one of the following carbohydrates is not an aldose C A D B E 8 Which one of the following hypothetical statements most accurately demonstrates what is meant by asymmetry in biological membranes A One organelle is separated from the cytoplasm by one biological membrane while another organelle is separated from the cytoplasm by two biological membranes B 40 of the sphingomyelin in a membrane is in one leaflet while 60 is in the other leaflet C One membrane in a cell contains cholesterol while a different membrane in that cell does not contain cholesterol D 40 of the total lipids in a membrane are in one leaflet while 60 are in the other leaflet E Each of the above hypothetical statements demonstrates what is meant by asymmetry in biological membranes 3 9 Which one of the following properties is a key characteristic of eukaryotic organisms MCB 150 Practice Exam I Spring 2011 A Multicellularity B Sexual reproduction C Compartmentalization D E A and C A B and C The figure below represents a small biological macromolecule Use the figure to answer the next three 3 questions 10 How many condensation reactions were performed to create the macromolecule in the figure A 0 B 1 C 2 D 3 E 4 11 The bond labeled B would be most accurately referred to as a n ester linkage A B 1 4 glycosidic linkage C peptide linkage D phosphodiester linkage E 1 4 glycosidic linkage 4 MCB 150 Practice Exam I Spring 2011 12 If a cell performed an additional condensation reaction to add another monomer to the macromolecule which one of the following statements about that reaction would be incorrect A The incoming monomer would be added to the end of the macromolecule labeled C B The reaction would be anabolic C The reaction would require enzymatic activity to occur at a biologically relevant rate D The reaction would take place in the cytoplasm of a bacterial cell E The reaction would take place inside a specific organelle in a eukaryotic cell 13 True or False As temperatures significantly increase beyond normal an animal cell can compensate for the increased fluidity in its biological membranes by increasing the number of cholesterol molecules in those membranes A True B False 14 Which one of the following statements about water is incorrect A Water organizes nonpolar molecules B Water can form ions C Water s low specific heat helps maintain temperatures D The solvent properties of water help move ions and polar molecules E Water s high heat of vaporization facilitates cooling 15 Which one of the following interactions is least likely to represent a possible contribution to a protein s tertiary structure A The clustering of hydrophobic amino acids in the interior of a globular protein B The weak attraction of the protons in the nucleus of one atom for the electrons of C An ionic bond between a glutamic acid and a lysine D A hydrogen bond between the carboxyl oxygen of one peptide bond and the amino E A covalent bond between two cysteines that come into close proximity with each another atom when those two atoms are in very close proximity hydrogen of another peptide bond other 5 MCB 150 Practice Exam I Spring 2011 The following figure depicts four hypothetical cells of varying sizes labeled A B C and D Use the figure to answer the next four 4 questions 16 Which one of the cells pictured has the smallest surface area to volume ratio 17 Which one of the cells pictured has the largest surface area A B C D A B C D C D C D 18 Assume that the diameters of cells A through D are 100 nm 10 m 100 m and 1 cm respectively In which cell would you reasonably expect life to occur for an organism with a single circular chromosome A B C D A B C D 6 MCB 150 Practice Exam I Spring 2011 19 You have discovered a cell matching the description in the previous question in a deep sea thermal vent under extreme pressure and heat Without any further characterization of this organism which one of the following conclusions could you reasonably draw A This cell is likely to be compartmentalized B This cell is an archael cell C This cell s mitochondria are separated from the cytoplasm by a double membrane D This cell s plasma membrane has an extensive amount of cholesterol to increase E None of the above conclusions can reasonably be drawn with only the information stability under this high temperature available 20 True or False When purified phospholipids are introduced to water liposomes will form rapidly and spontaneously without the need for an enzyme A True B False 21 You are performing sequence comparisons to determine evolutionary relatedness between two organisms using the same molecule used by Carl