问题
单项选择题
关于硒的生理功能，以下描述不正确的是( )。
A．调节甲状腺激素代谢
B．甲基化硒化物可抑制癌细胞生长
C．活化各种酶系
D．可能有抗肿瘤作用
答案
参考答案：C
解析： 微量元素——硒
硒的生理功能包括：①构成含硒蛋白与含硒酶。②抗氧化作用。③对甲状腺激素的调节作用。④维持正常免疫功能。⑤抗肿瘤作用。⑥抗艾滋病作用。⑦维持正常生育功能。
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关于硒的生理功能，以下描述不正确的是( )。
A．调节甲状腺激素代谢
B．甲基化硒化物可抑制癌细胞生长
C．活化各种酶系
D．可能有抗肿瘤作用
参考答案：C
解析： 微量元素——硒
硒的生理功能包括：①构成含硒蛋白与含硒酶。②抗氧化作用。③对甲状腺激素的调节作用。④维持正常免疫功能。⑤抗肿瘤作用。⑥抗艾滋病作用。⑦维持正常生育功能。
| The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals, ff 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14-Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. ff there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act. |
Gold which is 10 Karats m proportion
A．represents the highest grade of gold in the U.S.
B．cannot be sold in the U.S.
C．never carries a Karat quality mark.
D．represents the lowest-grade gold marketable in the U.S.