[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fCWseZ6XxXm1W_EAed81PEMcqYwOMl8kX1LUDCdkdA8c":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":31,"type":32},[],"2025-04-26 20:53:54",184750436,[8,9,10,11],"Mg2+","Ca2+","Cu2+","Zn2+",{"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","Muscle contraction is stimulated by the release of ______ from the sarcoplasmic reticulum",[21,33,42,51,60,69,76,85,90,99],{"answer":22,"createTime":23,"id":24,"options":25,"question":30,"source":31,"type":32},[],"2025-04-26 20:53:53",184750427,[26,27,28,29],"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":34,"createTime":23,"id":35,"options":36,"question":41,"source":31,"type":32},[],184750428,[37,38,39,40],"2","4","6","8","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",{"answer":43,"createTime":23,"id":44,"options":45,"question":50,"source":31,"type":32},[],184750429,[46,47,48,49],"IgA","IgE","IgG","IgM","______ is found principally in secretions such as saliva, tears, and milk",{"answer":52,"createTime":23,"id":53,"options":54,"question":59,"source":31,"type":32},[],184750430,[55,56,57,58],"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":61,"createTime":23,"id":62,"options":63,"question":68,"source":31,"type":32},[],184750431,[64,65,66,67],"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":70,"createTime":5,"id":71,"options":72,"question":75,"source":31,"type":32},[],184750432,[37,73,38,74],"3","5","Myosin has 2 heavy chains and ___ light chains",{"answer":77,"createTime":5,"id":78,"options":79,"question":84,"source":31,"type":32},[],184750433,[80,81,82,83],"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":86,"createTime":5,"id":87,"options":88,"question":89,"source":31,"type":32},[],184750434,[48,46,49,47],"Intestinal mucosa produces and secrets _________",{"answer":91,"createTime":5,"id":92,"options":93,"question":98,"source":31,"type":32},[],184750435,[94,95,96,97],"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":100,"createTime":5,"id":6,"options":101,"question":19,"source":31,"type":32},[],[8,9,10,11]]