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【单选题】
Which of the following statements about the structure of myosin is wrong?A.
Myosin (Mr 520,000) has six subunits: two heavy chains (each of Mr 220,000) and four light chains (each of Mr 20,000).
B.
The heavy chains account for little of the overall structure. At their carboxyl termini, they are arranged as extended α helices, wrapped around each other in a fibrous, left-handed coiled coil similar to that of α-keratin. At its amino terminus, each heavy chain has a large globular domain containing a site where ATP is hydrolyzed.
C.
The light chains are associated with the globular domains.
D.
When myosin is treated briefly with the protease trypsin, much of the fibrous tail is cleaved off, dividing the protein into components called light and heavy meromyosin.
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【简答题】简述革兰氏染色的操作步骤及原理。
【单选题】听力原文：M: Could you tell me something about yourself? W: Yes. I worked in a computer company for three years. Q: Where did the woman work for three years? (9)
A.
In a factory.
B.
In a company.
C.
In a travel service.
D.
In a university.
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