[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fKRSTcw6NVWsuVjCcbARMJvrCOcV2R6miEBdwOTyc_wM":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2025-04-26 20:53:53",184750428,[8,9,10,11],"2","4","6","8",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},167,"ecb63186fd2348dd972900f765a15722","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fe91b8b9d3b83a0d6a9d655b826214095.jpg","Biochemistry 《生物化学》一 专业基础课（全英教学）","a81562dfa9724d4ba2439a7cf910c76f","Test 5 - Lecture 5","A single antibody molecule contains ___ antigen-binding sites, which are formed by the combination of variable domains from one light (VL) and one heavy (VH) chain",[21,32,35,44,53,62,70,79,84,93],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],184750427,[25,26,27,28],"2 α subunits + 2 β subunits","2 β subunits + 2 θ subunits","2 α subunits + 2 θ subunits","2 α subunits + 2 ε subunits","Hemoglobin is a tetramer containing ____________________________, and there are strong interactions between unlike subunits","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],184750429,[39,40,41,42],"IgA","IgE","IgG","IgM","______ is found principally in secretions such as saliva, tears, and milk",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],184750430,[48,49,50,51],"tropomyosin","troponin","camodulin","myosin","A nerve impulse causes release of Ca2+ ions from the sarcoplasmic reticulum. The released Ca2+ binds to ___________ and causes a conformational change in the tropomyosin-troponin complexes, exposing the myosin-binding sites on the thin filaments and causing muscle contraction",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],184750431,[57,58,59,60],"greatly reduce","greatly increase","slightly reduce","slightly increase","2,3-Bisphosphoglycerate (BPG) is known to ____________ the affinity of hemoglobin for oxygen — there is an inverse relationship between the binding of oxygen and the binding of BPG",{"answer":63,"createTime":64,"id":65,"options":66,"question":69,"source":30,"type":31},[],"2025-04-26 20:53:54",184750432,[8,67,9,68],"3","5","Myosin has 2 heavy chains and ___ light chains",{"answer":71,"createTime":64,"id":72,"options":73,"question":78,"source":30,"type":31},[],184750433,[74,75,76,77],"In an average, healthy individual, 1% or less of the total hemoglobin is complexed as COHb","Since CO is a product of tobacco smoke, many smokers have COHb levels in the range of 3% to 8% of total hemoglobin, and the levels can rise to 15% for chain-smokers","COHb levels equilibrate at 50% in people who breathe air containing 570 ppm of CO for several hours","Because of their higher base levels of COHb, smokers exposed to a source of CO often develop symptoms slower than nonsmokers","Which of the following statements about CO-bound hemoglobin (COHb) is wrong",{"answer":80,"createTime":64,"id":81,"options":82,"question":83,"source":30,"type":31},[],184750434,[41,39,42,40],"Intestinal mucosa produces and secrets _________",{"answer":85,"createTime":64,"id":86,"options":87,"question":92,"source":30,"type":31},[],184750435,[88,89,90,91],"myofibrils","myofibroil","fibrils","myomere","Each muscle fiber a single, very large, multinucleated cell, 20 to 100 μm in diameter, formed from many cells fused together; a single fiber often spans the length of the muscle. Each fiber contains about 1,000 _________, 2 μm in diameter, each consisting of a vast number of regularly arrayed thick and thin filaments complexed to other proteins",{"answer":94,"createTime":64,"id":95,"options":96,"question":101,"source":30,"type":31},[],184750436,[97,98,99,100],"Mg2+","Ca2+","Cu2+","Zn2+","Muscle contraction is stimulated by the release of ______ from the sarcoplasmic reticulum"]