-1-BIOS 100 - Summer, 2008 Name:Exam I, 30 June, 2008Michael Muller, Instructor TA:This exam consists of 52 questions lovingly spread over 7 pages. Please check to see that all the pagesare present before you begin. Use a #2 pencil and bubble in all answers. There is a copy of the periodictable at the end of the exam. The answer to question 32 is C. Your score will be posted on the UICBlackboard site as soon as they are in. Good Luck! 1. What is the difference between C and C?13 14A. C has one more proton than C14 13B. C has one more neutron than C 14 13C. C has one more electron than C14 13D. C has one more proton and one more electron than C14 13E. None of the above2. How many covalent bonds would you expect Selenium (Atomic Number 34) to form?A. One B. Two C. Three D. Four E. Heck if I know...3. What type of ion is Rubidium (Rb, Atomic number 37) most likely to form?A. A positive ion B. A negative ion C. A neutral ion4. Which of the following molecules is the most polar?232262A. H O B. NH C. O D. C H E. N5. Which of the statements below (A-D) about water is FALSE? If statements A-D are true,then choose E.A. Water is the most common molecule comprising living organismB. Water is a very polar molecule C. Water has a very low heat of vaporizationD. Water is an excellent insulatorE. All of the above statements about water are TRUE6. In which molecule is Carbon the most reduced?26 2A. C H B. CO C. CO D. Not enough information to tell7. Which of the following is an example of a condensation reaction?A. DNA degradation B. Protein synthesis C. The burning of paperD. The creation of unsaturated bonds in a fatty acid E. None of the above8. The molecule below is an example of a (n):A. Polysaccharide B. Phospholipid C. SteroidD. Protein E. Nucleic Acid-2-9. Which of the below molecules is the most amphipathic?A. Polysaccharide B. Phospholipid C. SteroidD. Protein E. Nucleic Acid10. A disulfide bridge is a covalent linkage between two non-adjacent cysteine amino acids in aprotein. Disulfide bridges create very stable three-dimensional structures in proteins. Adisulfide bride is an example of a protein ________ structure.A. Primary B. Secondary C. Tertiary D. Quaternary11. Which of the nuleotides below is NOT a pyrimidine?A. Adenine B. Thymine C. Cytosine D. Uracil E. A & C12. Why are polymers so commonly seen structures of biological molecules?A. They have a low energy cost to constructB. A high diversity of molecules can be created from just a few different types ofmonomersC. They are easy to construct because a common bond type can join all availablemonomers into a polymerD. A & BE. B & C13. A peptide bond joins:A. Two monoglycerides B. A fatty acid to glycerol C. Two amino acidsD. Two nucleotideds E. None of the above14. The joining of actin subunits to form a microfilament is an example of protein ______structureA. Primary B. Secondary C. Tertiary D. Quaternary15. Which of the following is NOT a valid difference between DNA and RNA?A. DNA has an -H bound to the 2' carbon while RNA has an -OH bound to the 2' carbonB. DNA is more stable than RNAC. DNA is composed of ATC & G while RNA is composed of ATU & GD. Most of the genetic information is stored as DNA, not RNAE. All of the above are valid differences between DNA and RNA16. Peroxidase is an enzyme that is commonly found in most organisms. Below is a diagram illustrating the relationship betweenperoxidase activity and temperature for a gecko lizard, a fern, and ahuman. Match each curve to theappropriate organism.A. I human, II, fern, III geckoB. I fern, II, gecko, III humanC. I gecko, II human, III fernD. I gecko, II fern, III humanE. I human, II gecko, III fern-3-17. Which of the following statements (A-D) about ATP is FALSE? If statements A-D are true,then choose E.A. ATP is a modified nucleotideB. ATP is commonly called the “universal energy currency of living organisms”C. ATP contains unstable, high-energy phosphate bondsD. ATP is most commonly broken down to AMP to release energyE. All of the above statements about enzymes are TRUE18. Which of the following statements (A-D) about enzymes is FALSE? If statements A-D aretrue, then choose E.A. Enzymes lower the activation energy of the forward and reverse reactionsB. Enzyme activities are sensitive to external environmental conditions like temperatureand pHC. The substrates bind to the allosteric site of an enzymeD. Feedback inhibition is a common regulator of enzyme activityE. All of the above statements about enzymes are TRUE19. Which of the following is the best description of the induced fit model of enzyme-substratebinding?A. The active site is a nearly-perfect binding site for the substrates - they just slide rightinB. The substrates will easily bind to the active site, but some non-substrates can also bindif their concentration is high enoughC. Substrates cannot bind to the active site unless another molecule (the inducer) isbound to the allosertic site of the enzymeD. The substrates have an imperfect fit to the active site. This contorts the substrates,weakening the substrate bonds that will be rearranged in the reactionE. None of the above20. The pH of your stomach is roughly 2.0. What would you predict the pH optimum of pepsin,an enzyme which digests proteins in your stomach, to be?A. 1.5 B . 2.0 C. 2.5 D. 7.0 E. 10.021. Which of the following graphs most accurately represents an enzyme’s activity as a functionof external pHA B C D22. Which of the following is NOT a part of the endomembrane system?A. Rough Endoplasmic Reticulum B. Outer nuclear membrane C. Golgi apparatus D. LysosomeE. Chloroplast-4-23. Which of the following statements (A-D) about the enzyme system that converts threonine toisoleucine is FALSE? If statements A-D are true, then choose E.A. This system is regulated by negative feedbackB. The enzyme threonine deaminase has both an active site and an allosteric siteC. The concentration of isoleucine can affect the activity of threonine deaminaseD. Both threonine and isoleucine can easily bind to the enzyme at the same timeE. All of the above statements about the enzyme system that converts threonine toisoleucine are TRUE24. Plant cells contain mitochondriaA. True B. False25. Which of the following is not a component of all cells?A. DNA B. Ribosomes C. Endomembrane systemD. Cytoplasm E. All of the above