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【单选题】
酶不可逆抑制的机制是:( )A.
使酶蛋白变性
B.
与酶的催化中心以共价键结合
C.
与酶的必需基团结合
D.
与活性中心的次级键结合
E.
与酶表面的极性基团结合
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The general symptoms of beriberi DOES NOT Include:
A.
Tingling or loss of sensation
B.
Irregular heart rate
C.
Difficulty in walking
D.
Vomiting
【单选题】Marketable securities are:
A.
Originally recorded at cost less any broker's commission.
B.
Sold for a gain when cash received is less than the cost basis.
C.
Almost as liquid as cash.
D.
Listed immediately after Inventory on the balance sheet.
【单选题】社会主义社会存在着敌我之间的矛盾和人民内部的矛盾。下列关于这两类社会矛盾的说法，错误的是
A.
敌我之间的矛盾是对抗性的矛盾
B.
人民内部的矛盾是全体人民根本利益不一致的矛盾
C.
解决敌我矛盾应采用专政的、强制的方法
D.
解决人民内部矛盾应采用民主的、说服教育的方法
【单选题】The main idea in this passage is that ______.
A.
most marketable pearls are cultured because nature does not produce enough of its own to satisfy the market
B.
cultured pearls are of a higher quality than natural pearls
C.
there are two major methods of pearl-making
D.
a natural 'drought' of pearl production is taking place
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