问题
单项选择题
雄激素转化为雌激素需要下列哪种酶
A．3β-羟甾脱氢酶
B．Δ4，5异构酶
C．17α-羟化酶
D．芳香化酶
E．21-羟化酶
答案
参考答案：D
解析：睾酮经过去甲基和芳香化作用后转化为雌二醇，此过程需要芳香化酶的作用。
搜题请搜索小程序“爱下问搜题”
雄激素转化为雌激素需要下列哪种酶
A．3β-羟甾脱氢酶
B．Δ4，5异构酶
C．17α-羟化酶
D．芳香化酶
E．21-羟化酶
参考答案：D
解析：睾酮经过去甲基和芳香化作用后转化为雌二醇，此过程需要芳香化酶的作用。
| 完型填空。 |
| Mike didn't live too far away from school. He liked to 1 to school every day. When it rained, like many 2 boys, Mike liked playing in the water. One afternoon, when the boy came 3 , he was all wet. His mother became very 4 and said, " 5 play in the water after school." The next day he was very 6 again, and his mother became 7 angrier. "I'll tell your father if you go to play in the water again." she said. The 8 day the boy was dry (干的) when he came back from school. "You are a 9 boy today." His mother said 10 . "You didn't play in the water." "No." Mike answered, "Because there were so many older boys in the water, I couldn't play in it." |
| ( )1. A. have ( )2. A. other ( )3. A. house ( )4. A. angry ( )5. A. Not ( )6. A. late ( )7. A. very ( )8. A. two ( )9. A. good ( )10. A. angrily | B. walk B. others B. family B. happy B. Can't B. early B. more B. second B. well B. happy | C. fly C. more C. home C. good C. Don't C. dry C. much C. three C. bad C. luckily | D. come D. much D. room D. sad D. No D. wet D. many D. third D. worse D. happily |