B150Mf02t1f2 - Bil 150 Section PT Fall 2002 Form # 2 Test...

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Unformatted text preview: Bil 150 Section PT Fall 2002 Form # 2 Test #1 October 01, 2002 Multiple Choice Instructions: Pick the BEST answer from among the choices given in each question. 1. All living organism have been placed into 3 domains (or branches of a phylogenetic tree – Archae, Eubacteria, & Eukarya) based upon the comparison of the nucleotide sequences in which of the following molecules? a) small-subunit ribosomal RNA b) amylopectin c) enzyme lysozyme d) human DNA e) none of these 2. According to the cell theory, all living cells? a) arise spontaneously b) are derived from pre-existing cells c) had an extraterrestrial origin d) have vastly different chemical compositions e) none of these is a correct choice 3. According to the Darwinian Theory of Evolution, which of the following are factually correct observations? a) individuals in a population vary in hereditable traits b) variation accounts for the diversity of biological organisms c) organisms change gradually over time to become new forms d) a primary mechanism of evolution is Natural Selection e) choose this answer if all of the above statements are factually correct observations of evolutionary theory 4. There are unique laws governing the living condition that are separate and distinct from natural and physical laws that govern the Universe. a) true b) false 5. The hypothesis that primitive precursor life forms may have drifted in from space, on the radiation emitted by stars, and eventually may have colonized the planet Earth is often referred as the theory of ? a) Special Creation b) Panspermia c) chemical evolution d) the Big Bang e) none of these is correct 6. While determining if there is intelligent life elsewhere in the Universe is not really experimentally testable, the chemical evolutionary Origin of Life ideas are testable with experiments like the Miller-Urey formation of organic molecules? a) true b) false 7. Which of the following might have served as possible sources of the precursor molecules of life on Earth? a) meteorites b) deep ocean hydrothermal vents c) asteroids or comets d) all of these e) none of these 8. Minerals may have played an important role in chemical evolution of the early molecules of life by providing flat surfaces as an easy way to concentrate monomer-like molecules from in dilute solution. a) true b) false 9. A the present time, the human population is growing _____?_____ . a) arithmetically (2,4,6,8,10) b) exponentially (2,4,8,16,32) c) it is not expanding but rather declining d) choose this answer if none of the above is correct 10. Replacement Level Fertility is defined as the number of children an individual fertile woman should have to only replace the current human population levels. At present, that number, on average, is between 2.1 and 2.5 for humans. a) true b) false 11. Proteins that have a different primary structure, but exhibit the same catalytic activity or function exhibit? a) no tertiary structure b) polymorphism c) allosteric regulation d) inhibition e) none of these 12. Which of the following gases contribute to or are responsible for the “Greenhouse Effect”? a) oxygen b) nitrogen c) chlorine & ozone d) methane & CO 2 e) none of these is correct 13. A tentative explanation that accounts for a set of facts and may be testable is referred to as a(n)? a) prediction b) observation c) hypothesis d) deduction e) none of these is correct 14. Ibuprofen is a non-specific anti-inflammatory drug, when taken before strenuous exercise can reduce muscle ache afterward. This statement of fact, given as objectively real, is a testable prediction that is treatable by the scientific method? a) true b) false Bil150F02 T1 Form 2 – pg 2 15. The class of amino acids, which includes alanine, valine, and leucine, and contains only hydrocarbon side groups making the these amino acids hydrophobic are the? a) acidic amino acids b) polar ami no acids c) the basic amino acids d) non-polar amino acids e) none of these 16. In the artificial selection of wild mustard plants to produce “broccoli”, plant breeders would select plants that are larger and larger with respect to which of the following plant structures? a) length of petioles b) root length c) side buds d) flowers e) none of these is a correct choice 17. Which of the following minerals is able to attract D & L optical isomers of amino acids to its different crystal faces thus possibly allowing origin of life chemical evolutionary processes to select one isomer over the other for living systems? a) feldspar b) magnetite (iron oxide) c) clay d) calcite e) none of these is correct 18. The type of cellular chemical reaction depicted in the figure to the right is most probably? a) condensation b) hydrolysis c) oxidation/reduction (redox) d) photosynthesis e) choose this answer if none of the above is correct 19. The electrically neutral subatomic particle that is part of an element’s atomic nuclei is a(n)? a) proton b) neutron c) electron d) sodium e) none of these is correct 20. The atomic form of an element that contains a different number of neutrons and thus has a different atomic mass is? a) an isomer b) a Dalton c) an isotope d) crystal e) none of these is correct 21. The type of chemical attraction in which two atoms share one pair of electrons in a mutual valance shell is a(n)? a) polar bond b) ionic bond c) hydrogen bond d) covalent bond e) none of these is correct 22. If the hydrogen ion concentration of a given solution is 10-4 then the solution is said to be? a) acidic b) neutral c) basic d) none of these is a correct choice 23. A covalent bond between one cysteine residue in a protein and another cysteine residue in the protein is known as a(n)? a) peptide bond b) disulfide bridge (bond) c) ionic bond d) glycosidic bond e) none of these 24. The function group abbreviated as -COOH is known as a(n)? a) carbonyl b) alcohol c) methyl d) carboxyl e) none of these is a correct choice 25. The type of chemical bond shown at the letter “X” in the figure to the right is? a) glycosidic bond b) fatty ester bond c) phosphodiester bond d) hydrophobic bond e) none of these is correct 26. The molecule referred to in the question above and depicted in the figure is most likely a(n)? a) dinucleotide b) dipeptide c) disaccharide d) triglyceride e) none of the above is correct 27. The spatial arrangement of atoms in a molecule which can not be inter-converted without breaking bonds and is based based upon covalent bonds is ? a) conformations b) configurations c) D & L optical isomers d) isotopes e) none of these is correct 28. Which of the two molecules drawn on the right would allow free rotation of the atoms attached to each of its carbon atoms? a) A b) B c) neither of these would allow free rotation 29. The class of proteins that can contract, change shape, and include actin, myosin, and elements of cytoskeleton & muscles? a) defensive proteins b) transport proteins c) contractile proteins d) regulatory proteins e) none of these is a correct choice Bil150F02 T1 Form 2 – pg 3 30. The chemical formula that provides information about bond geometry (spatial relationship) between atoms is? a) molecular formula b) ball and stick model c) oxidation formula d) periodic formula e) none of these 31. Which atom of a water molecule is the most electronegative atom? a) oxygen b) hydrogen c) carbon d) methane e) none of these is correct 32. Water is an effective solvent because it ? a) is a polar molecule b) has an unequal distribution of internal charge c) can form hydrogen bonds d) choose this answer if all of the above are correct and contribute to water’s solvent properties 33. Ice is less dense than water, because it expands as hydrogen bonds reform, when it changes from a liquid (cubic shape) to a solid (hexagonal shape). a) true b) false The next 3 questions relate top the enzyme kinetic curves drawn below. 34. What is the Vmax for enzyme-A? a) 0.6 micromoles of phosphate b) 8 mg/min G6P e) choose this answer if none of these is correct c) 12 mg/min G6P 35. What is the Km (Michaelis Constant) for Enz-C? a) 12 mg/min G6P b) 6.0 micromoles phosphate c) 0.6 micromoles phosphate d) 50 micromoles phosphate e) none of these is a correct choice 14 Glucose phosphatase 12 mg/min G-6-P 10 8 6 4 2 0 0.002 0.5 0.6 d) 12 mg/min G6P 0.8 micromoles Phosphate 2 4 8 Enz-A 16 24 Enz-B 48 50 36. When comparing Enz-A with Enz-C, it is likely that Enz-C is an inhibited form of Enz-A. What type of inhibition is being exhibited by the curve for Enz-C? a) competitive inhibition b) non competitive inhibition c) Neither of these is correct Enz-C The next 3 questions relate to the figure to the right. 37. What type of weak molecular force is exhibi ted at the label “B” ? a) hydrogen bonds b) ionic bonds c) disulfide bonds d) hydrophilic bonds e) none of these is a correct choice 38. What type or level of protein structure is being exhibited at the circle labeled “H” ? a) alpha helix b) quaternary c) beta sheet d) allosteric e) none of these 39. Which label best represents the weak molecular force known as a hydrophobic force (or hydrophobic interactions)? a) A b) B c) C d) D e) none of these is a correct choice Bil150F02 T1 Form 2 – pg 4 40. The passage of a protein mixture through a porous gel that can result in separation of proteins based upon their size and electrical charge is known as? a) polyacrylamide gel electrophoresis b) size exclusion chromatography c) differential centrifugation d) ion-exchange chromatography e) none of these is a correct choice 41. Feedback inhibition of an initial enzyme in a metabolic pathway most probably is controlled by allosteric regulation? a) true b) false 42. Most protein (and enzymes) have a hydrophobic interior core and a hydrophilic exterior and can be described as having a globular 3-dimensional shape. a) true b) false The next 3 questions relate to the figure to the right. 43. The entire molecule labeled “T” is which of the following types of monomer molecule? a) an amino acid b) a nucleotide c) a carbohydrate d) a fatty acid e) none of the se is a correct choice 44. The type of reaction that is occurring in the figure between molecule “A” & “T” is? a) hydrolysis b) condensation c) depolymerization d) combustion e) none of these is a correct choice 45. The type of chemical bond that is formed by the phosphate link between “A” & “T” is? a) hydrogen bond b) glycosidic bond c) disulfide bond d) phosphodiester bond e) none of these is correct 46. The regulation of an enzyme’s activity by binding a regulator molecule to a site on the enzyme other than the active site is referred to as? a) coenzyme regulation b) quaternary regulation c) allosteric regulation d) hydrophobic interaction e) none of these is correct 47. What will be the total ionic charge of the amino acid depicted in the figure shown on the right at pH 3.0? a) 0 (zero or neutral) b) -1 c) + 1 d) -2 e) none of these is correct 48. Quaternary structure occurs in proteins that are composed of more than one polypeptide chain. a) true b) false 49. A change in which of the following might you expect would result in the reversible denaturation of an enzyme protein? a) pH b) temperature c) ionic strength d) solubility e) choose this choice if all of the above may result in reversible protein denaturation 50. The protein isolation method of column chromatography in which proteins are separated from each other because the medium of separation is modified for specific chemical recognition of the protein is known as? a) 2-D electrophoresis b) affinity chromatography c) size-exclusion chromatography d) ion-exchange chromatography e) none of these is correct ...
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This note was uploaded on 02/10/2012 for the course BIL 150 taught by Professor Gaines during the Fall '07 term at University of Miami.

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