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单选题 ______ is found principally in secretions such as saliva, tears, and milk
学科：Biochemistry 《生物化学》一 专业基础课（全英教学）
时间：2025-04-26 12:53:53
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题目1单选题
Hemoglobin is a tetramer containing ____________________________, and there are strong interactions between unlike subunitsA. 2 α subunits + 2 β subunitsB. 2 β subunits + 2 θ subunitsC. 2 α subunits + 2 θ subunitsD. 2 α subunits + 2 ε subunits
题目2单选题
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) chainA. 2B. 4C. 6D. 8
题目3单选题
______ is found principally in secretions such as saliva, tears, and milkA. IgAB. IgEC. IgGD. IgM
题目4单选题
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 contractionA. tropomyosinB. troponinC. camodulinD. myosin
题目5单选题
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 BPGA. greatly reduceB. greatly increaseC. slightly reduceD. slightly increase
题目6单选题
Myosin has 2 heavy chains and ___ light chainsA. 2B. 3C. 4D. 5
题目7单选题
Which of the following statements about CO-bound hemoglobin (COHb) is wrongA. In an average, healthy individual, 1% or less of the total hemoglobin is complexed as COHbB. 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-smokersC. COHb levels equilibrate at 50% in people who breathe air containing 570 ppm of CO for several hoursD. Because of their higher base levels of COHb, smokers exposed to a source of CO often develop symptoms slower than nonsmokers
题目8单选题
Intestinal mucosa produces and secrets _________A. IgGB. IgAC. IgMD. IgE
题目9单选题
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 proteinsA. myofibrilsB. myofibroilC. fibrilsD. myomere
题目10单选题
Muscle contraction is stimulated by the release of ______ from the sarcoplasmic reticulumA. Mg2+B. Ca2+C. Cu2+D. Zn2+
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