[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-331850-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-331850-en":131},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","exam-i-final-answers","Exam I - Final Answers","","Biochemistry I Exam I question set focused on enzyme catalysis, amino acid structure and ionization, peptide bond formation, and solution chemistry. The assessment covers solvent properties of water, hydrogen bonding behavior, hydrophobic effects in membranes and proteins, phase-change density changes in water/ice, and carbohydrate-like acid dissociation equilibria. It also includes gel filtration and SDS-PAGE concepts, isoelectric point determination via pH gradients, and comparative acid strength reasoning for glycine versus acetic acid.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/exam/","Exam",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/exam-i-final-answers/331850/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/exam-i-final-answers/331850.png","ImageObject",300,407,{"name":42,"@type":43},"Jacob","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-25","2026-09-21",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",14,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What does it mean for an enzyme to increase reaction rate?","Question",{"text":63,"@type":64},"Enzymes affect reactions by changing the pathway so that the rate increases, even though they do not change the overall free energy change of the reaction.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"Which statement about hydrogen bonds is not true?",{"text":68,"@type":64},"The question asks for the incorrect statement among options describing bond strength, boiling point effects, lifetimes in water, and average hydrogen-bond coordination.",{"name":70,"@type":61,"acceptedAnswer":71},"How is the isoelectric point of a protein determined in the described approach?",{"text":72,"@type":64},"A gel is first established to create a stable pH gradient using ampholytes in an electric field, and the protein migration pattern is used to identify the isoelectric point.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},331850,1790189117,{"code":4,"msg":82,"data":83},"success",[84,88,92,95,100,105,110,115,120,123,127],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":93,"slug":94},70,"exam",{"id":96,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},5,"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":102,"show_sort_weight":103,"slug":104},6,"Technology",50,"technology",{"id":106,"doc_module":4,"doc_module_name":25,"category_name":107,"show_sort_weight":108,"slug":109},7,"Healthcare",40,"healthcare",{"id":111,"doc_module":4,"doc_module_name":25,"category_name":112,"show_sort_weight":113,"slug":114},8,"Research & Report",30,"research-report",{"id":116,"doc_module":4,"doc_module_name":25,"category_name":117,"show_sort_weight":118,"slug":119},9,"Religion & Spirituality",20,"religion-spirituality",{"id":118,"doc_module":4,"doc_module_name":25,"category_name":121,"show_sort_weight":118,"slug":122},"World Cup","world-cup",{"id":124,"doc_module":4,"doc_module_name":25,"category_name":125,"show_sort_weight":124,"slug":126},10,"Lifestyle","lifestyle",{"id":128,"doc_module":4,"doc_module_name":25,"category_name":129,"show_sort_weight":96,"slug":130},19,"General","general",{"code":4,"msg":82,"data":132},{"doc_id":79,"user_id":133,"nickname":42,"user_avatar":134,"doc_module":4,"category_id":33,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":124,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":144,"read_time":145,"preview_page_count":4},962084931830,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","Exam I  \nSeptember 25, 2023 Biochemistry I  \nBI/CH 421/621  \nNAME: For GradeScope, please write your FIRST and  \nLAST name in CAPITAL letters WITHIN the box:  \nI ._________________ /48  \nII ._________________ /12  \nIII ._________________ /30  \nIV ._________________ / 10  \nTOTAL ________________ /100  \nI . MULTIPLE CHOICE . (48 points; 3 pts each)  \nChoose the BEST answer to the question and write the letter in the appropriate box to the left .  \n1. Enzymes are biological catalysts that affect a reaction by:  \nA . increasing the amount of free energy released .  \nB . decreasing the amount of free energy released .  \nC . increasing the change in entropy .  \nD . increasing the rate .  \nE . decreasing the rate .  \n2. The reaction of two amino acids to form a dipeptide is a(n):  \nA . cleavage .  \nB . condensation .  \n[C. group](C. group) transfer.  \nD . oxidation-reduction .  \nE . rearrangement .  \n3. The enthalpy change ∆H for the formation of ammonia from hydrogen and nitrogen is-46.11 kJ/mol . This reaction is:  \nA . exergonic .  \nB . endergonic .  \nC . exothermic .  \nD . endothermic .  \n[E. at](E. at) equilibrium  \n4. Water is generally a good solvent for polar molecules and a poor solvent for nonpolar molecules . These solvent properties are best explained by  \nA . the high density of liquid water relative to polar solvents  \nB . the ability to form intermolecular hydrogen bonds  \nC . the density of solid water being less than the density of liquid water  \nD . high surface tension  \nE . high heat of vaporization  \n5. The properties of water include  \nA . the ability to form hydrophobic interactions with itself  \nB . a disordered structure in the liquid state  \nC . a low dielectric constant  \nD . being a strong dipole, with a partially negative end at the O atom  \nE . a diameter of 5 Å  \nPage 2  \n6. Which of the following pairs of molecules could NOT hydrogen bond with eachother?  \n(A)  \n(B)  \n(C)  \n(D)  \n(E)  \n7 . The hydrophobic effect can make important energetic contributions to:  \nA . membrane structure .  \nB . folded protein structures .  \nC . micelles of SDS and protein .  \nD . enzyme-substrate interactions .  \nE . oil droplets coming together .  \nF . all of the above .  \n8 . Phosphoric acid is tribasic, with pKa s of 2 . 14, 6.86, and 12.4. The ionic form that predominates at pH 3.2 is:  \nA . H 3PO 4 . B . H 2PO 4- . C . HPO 42- . D . PO 43- .  \n9 . As the phase changes from water to ice, the decreased density of the water is due to:  \nA . the loss of hydrogen bonds  \nB . the gain of ionic bonds  \nC . the gain of more van der Waals contacts  \nD . the spacial arrangement of the assymetrical water molecules as they form the maximum number of hydrogen bonds possible  \nE . the hydrophobic effect, which is driven by electrostatic interactions  \n10 . Which of these statements about hydrogen bonds is not true?  \nA . Individual hydrogen bonds are much weaker than covalent bonds .  \nB . Hydrogen bonds account for the anomalously high boiling point of water .  \nC . Individual hydrogen bonds in aqueous water exist for many seconds and sometimes for minutes .  \nD . In liquid water, the average water molecule forms hydrogen bonds with 3 to 4 other water molecules .  \nPage 3  \n11. Which of the following amino acids has a sulfur atom in its side chain?  \nA . Asn B . Glu C . Phe  \nD . Met E . Tyr F . Thr  \n12 . Of the 20 standard amino acids, only   is not optically active . The reason is that its side chain   .  \nA . proline; forms a covalent bond with the amino group .  \nB . alanine; is a simple methyl group .  \nC . glycine; is unbranched .  \nD . alanine; contains only hydrogen .  \nE . glycine; is a hydrogen atom .  \n~~ ~~13 . In a mixture of the five proteins listed below, which should elute second in size-exclusion (gel filtration) chromatography?  \nA . cytochrome c , Mr = 13,000  \nB . immunoglobulin G, Mr = 145,000  \nC . ribonuclease A, Mr = 13,700  \nD . RNA polymerase, Mr = 450,000  \nE . serum albumin, Mr = 68,500  \n14 . By addin","cbCaiuQBVgBMvylg","https://ap.wps.com/l/cbCaiuQBVgBMvylg","pdf",859353,"English","# Multiple Choice\n## Enzymes and thermodynamics\n## Amino acids, peptides, and pKa\n## Water, solvents, and hydrogen bonding\n## Hydrophobic effect\n## Chromatography and electrophoresis\n## Protein microenvironment and ionization\n## Acid strength comparisons","[{\"question\":\"What does it mean for an enzyme to increase reaction rate?\",\"answer\":\"Enzymes affect reactions by changing the pathway so that the rate increases, even though they do not change the overall free energy change of the reaction.\"},{\"question\":\"Which statement about hydrogen bonds is not true?\",\"answer\":\"The question asks for the incorrect statement among options describing bond strength, boiling point effects, lifetimes in water, and average hydrogen-bond coordination.\"},{\"question\":\"How is the isoelectric point of a protein determined in the described approach?\",\"answer\":\"A gel is first established to create a stable pH gradient using ampholytes in an electric field, and the protein migration pattern is used to identify the isoelectric point.\"}]","Exam I - Final Answers | PDF",1789995485,25]