Place books and papers away and power off cell phones No calculators or other materials allowed during the exam Do not talk or allow other students to view your answers during the exam Short answer Write your initials and 810 where indicated at the top of each page Answer the questions in the space provided Please write neatly Answers we cannot read or interpret are marked as incorrect Multiple Choice Use a 2 pencil to enter your nine digit 810 where it says ID Number at the top of the scantron form and bubble in the circles Write your name clearly LAST name first and indicate the date time of the test your section When you are finished with the test Bring your scantron and test to the front of the room with a photo ID Multiple Choice 3 pts each Factual Recall Questions 1 Imagine a newly discovered biological molecule that is mostly hydrophobic in its structure This new molecule will most likely be classified as a A protein B lipid C nucleic acid D carbohydrate 5 atoms give organic molecules their overall shape atoms determine the chemical behavior of organic molecules A H N and O carbon B Carbon H N and O C Carbon H2O D Hydrogen C N and O 2 Whole foods better for your health than processed foods because A Processed foods contain more fiber which make it more difficult to digest B Whole foods contain less lipid than processed foods C Processed foods have fewer vitamins and minerals than whole foods D Processed foods are digested more slowly 6 The structure shown in above is a n A nucleic acid B steroid sterol C fatty acid D carbohydrate E phospholipid 3 Molecules embedded in phospholipid bilayers that form channels allowing molecules to pass into and out of the cell are made of A proteins B lipids C carbohydrates D nucleic acids Concept Application Questions 3 pts each 7 When water evaporates from your skin breaking which bonds is most important in helping you give off heat A polar covalent bonds between oxygen and hydrogen in single water molecules B hydrogen bonds between two water molecules C nonpolar covalent bonds D ionic bonds between water and salt E hydrogen bonds between oxygen and hydrogen in single water molecules 4 amino acids are joined to make a protein by covalent bonds between A the amino and an R group B two R groups C the carboxy and amino group D the carboxy and an R group 1 8 Water has a pH of 7 Which solution has a H concentration that is 100 times greater A eggs pH 8 B milk pH 6 C baking soda pH 9 D ammonia pH 11 E bananas pH 5 12 A vegetable oil liquid containing the fatty acid shown above is modified to make margarine solid Which molecule below is most likely the modified fatty acid 9 Imagine a balloon is made from a membrane that s permeable to water but not sucrose molecules If the balloon is filled with a 50 sucrose solution and then placed in a beaker of water how will the concentration of sucrose change inside the balloon if at all A It won t change B The concentration will increase and then decrease C It will become less concentrated D It will become more concentrated A B 10 If cells are grown in a medium containing radioactive 32P labeled phosphate which of C D all of the above could be the modified fatty acid these molecules will be labeled A starch B proteins C nucleic acids D fatty acids E all of the above 13 Respiring cells release CO2 into the bloodstream How would you expect this CO2 increase to effect pH as blood first comes in contact with respiring cells A Blood pH will decrease slightly B Blood pH will increase slightly C Blood pH will remain unchanged D Blood pH will first decrease then increase sharply as CO2 combines with hemoglobin Nutrition Facts Serving Size 1 packet 35g Servings Per Container 10 Amount Per Serving Calories 160 Total Fat 6g Saturated Fat 2 5g Cholesterol 0mg Sodium 170mg Total Carbohydrate 24g Dietary Fiber 4g Sugars 12g Protein 4g Daily Value 9 11 0 7 8 16 11 How many calories in this food were contributed by carbohydrate A 24 B 54 C 80 D 96 2 Last Initial First Initial 810 Do not write in this box Short Answer Questions 1 You are working with the amino acid shown at the right For each question below show your work to receive full credit a Write the molecular weight of the amino acid in the space provided 4 pts b How many grams would you need to make 250 ml no more of a 0 4 M solution 4 pts c You use your solution from part b above as a stock to make 100 ml a 0 1 M solution 4 pts What volume of stock solution will you need What volume of water will you need 2 The amino acid solution you made in question 1 has a pH of 9 12 pts a if you decrease the H 8 fold the new pH of the solution should be a b If you increase the H 1000 fold the new pH of the solution should be b c If the pH of the solution were 4 the H concentration would be c 3 For the molecule shown in the space provided name and draw the structure of an added functional group that would accomplish the following 10 pts a make this molecule more acidic Name b make this molecule more non polar Name 4 Use the figure of the molecule at the right to answer the following questions 9 pts a What is the name of this macromolecule b On the figure clearly circle all of the bonds that would be broken if the molecule underwent hydrolysis c Name the products of hydrolysis of this molecule 5 The figure at the right shows trans membrane protein Part of the protein is circled by a dotted line Use the accompanying amino acid table to help you answer the following questions a BRIEFLY in the space provided describe how amino acids in the circled regions would likely differ from amino acids outside of this region 6 pts Inside Outside b Circle the amino acids from the list below most likely to be found in the circled region 2 pts Alanine Arginine Asparagine Leucine Glutamic acid Serine 6 The plasma membrane for a cell that has been placed into a solution is shown below The identity and starting concentrations of various solutes are shown for both inside and outside the cell An arrow indicates the direction molecules move across the membrane In the space provided name the specific transport mechanism most likely used to move the molecule across the membrane simple diffusion facilitated diffusion active transport endocytosis or exocytosis 10 pts Outside Cell Membrane CO2 Mg 2 Glucose Cellulose Serine Amino acid 0 01 M L 9 g L 15 mg L 3 mM L 0 25 M L Inside Cell 0 02 …