Cellular & Molecular Biology Exam: Unit I - Emergent Properties & Forces - Prof. James Orr, Exams of Cellular and Molecular Biology

Download Cellular & Molecular Biology Exam: Unit I - Emergent Properties & Forces - Prof. James Orr and more Exams Cellular and Molecular Biology in PDF only on Docsity! 1 Biology 150: Principles of Cellular and Molecular Biology September 23, 2008 Unit I Exam Please fill in your name and ID no. on the scantron answer sheet. Be sure to darken the circles beneath your name and ID number. Please enter the code for this exam (provided at the bottom on the last page of the exam) on your scantron sheet (left most column of CODES section). The code will either be the number 1, 2, 3 or 4. It is critical that you darken the appropriate circle so that your exam will be scored correctly. Provide all answers on the answer sheet. If the question is of multiple-choice format, please choose the best answer from the responses that are given. Darken the circle on the answer sheet completely. 1. Based on your understanding of the theme of emergent properties which of the following pairs of terms does NOT represent an example of this concept? a. individual fat cells: adipose tissue b. fatty acid: triacylglycerol c. phosphate group: starch d. nucleotide: nucleic acid e. nitrogen atom : ammonia molecule 2. A water droplet forms because of the attraction between adjacent water molecules. What is the basis for this attraction between adjacent or neighboring water molecules? a. polar covalent bonding between the oxygen atom of one water molecule and hydrogen atom of an adjacent water molecule b. hydrogen bonding between the hydrogen atom of one molecule with an electronegative oxygen atom in an adjacent water molecule c. nonpolar covalent bonds between the oxygen atom of one water molecule and hydrogen atom of an adjacent water molecule d. ionic bonds between the oxygen atom of one water molecule and hydrogen atom of an adjacent water molecule 2 Questions numbered 3 through 8 refer to the functional groups listed below. Choose the best answer for each question. You may use each letter more than once if needed. A. hydroxyl group B. carbonyl C. carboxyl D. amino E. phosphate 3. forms the N terminus end of a polypeptide 4. forms the C terminus end of a polypeptide 5. functional group at the end of an aldose molecule 6. bonded to five of the six carbon atoms within glucose 7. responsible for the acidic properties of fatty acids 8. provides hydrophilic properties for phospholipids 9. Sodium hydroxide has a molecular mass of 40 g. In order to prepare 0.5 liter of a 2 M solution, how much NaOH must be added to one-half liter of water? a. 10 g b. 20 g c. 30 g d. 40 g e. 80 g 10. Compared to 31 P, 32 P has a. a different atomic mass b. a different number of protons c. a different number of neutrons d. both a and c are true e. a, b and c are all true 11. Which of the following statements describe a difference between α glucose and β glucose a. the total number of hydroxyl groups differs between the two molecules b. the placement of the hydroxyl group on the sixth carbon atom differs between the two molecules c. the placement of the hydroxyl group on the first carbon atom differs between the two molecules d. there is a double bond between the first and second C atom for α glucose but not for β glucose 5 18. A scientist is given two samples of fatty acids. She determines that the ratio of hydrogen to carbon is greater for the fatty acids within solution A compared to the fatty acids within solution B. Which solution would contain a higher concentration of unsaturated fatty acids? a. solution A b. solution B c. the concentration of unsaturated fatty acids is the same for solution A and solution B d. one cannot determine the relative concentration of unsaturated fatty acids within the two solutions with the information that is provided The bonds or interactions that are illustrated below contribute to establishing the structure of proteins. Use this diagram to answer questions number 19-22. 19. Disulfide bond 20. Hydrophobic interactions 21. Ionic bonds 22. Hydrogen bonds 23. The bonds or interactions shown above contribute what level of protein structure? a. primary b. secondary c. tertiary d. quaternary e. all levels of protein structure 6 For questions no 24 through 26 consider the following bonds that join monomers of common macromolecules. 24. ester bond that joins fatty acids to glycerol to form triacylglycerol 25. glycosidic linkage that joins monosaccharides to form a polysaccharide 26. peptide bond that joins amino acids to form polypeptides 27. CH4 is a. a structural isomer of C2H5OH b. a structural isomer of CH3 c. a compound d. a isotope of hydrogen e. both b and c are true 28. A magnesium cation with a double positive charge (Mg ++ ) is formed in solution. Magnisium has an atomic number of 12 and an atomic mass of 24. This magnesium cation would have a. 10 electrons b. 12 protons c. 12 neutrons d. a and b are true e. a, b, and c are all true 7 For questions no. 29 through 31, consider the R groups for the three amino acids shown below and the ability of these R groups to interact with R groups from neighboring amino acids in a polypeptide chain. Use each amino acid (1, 2 or 3) only once. 29. Which one of these amino acids has a nonpolar R group that could participate in hydrophobic interactions with neighboring amino acids? a. leucine (Leu or L) b. Tyrosine (Tyr or Y) c. Glutamic acid (Glu or E) d. none of the above amino acids has a nonpolar R group 30. Which one of these amino acids has a polar R group? a. leucine (Leu or L) b. Tyrosine (Tyr or Y) c. Glutamic acid (Glu or E) d. none of these R groups could participate in the formation of a H bond 31. Which one of the three amino acids has a R group that could form an ionic bond with a neighboring amino acid? a. leucine (Leu or L) b. Tyrosine (Tyr or Y) c. Glutamic acid (Glu or E) d. none of the above amino acids has a nonpolar R group