The mornings in the forest throb with the dawn chorus of scores of bird voices. Which of the following expessions has the same meaning with the underlined part?
A. are covered with
B. vibrate with
C. deal with
D. are connected with
查看答案
体内硫酸根主要来自哪种氨基酸
A. Met
B. Cys
C. Trp
D. Phe
白化病是由于先天性缺乏
A. 脯氨酸羟化酶
B. 苯丙氨酸羟化酶
C. 色氨酸羟化酶
D. 酪氨酸酶
S-腺苷甲硫氨酸的重要生理作用是
A. 提供能量
B. 合成胸腺嘧啶
C. 合成非必需氨基酸
D. 甲基供体
经分解代谢可生成一碳单位的氨基酸是
A. 组氨酸
B. 谷氨酸
C. 甘氨酸
D. 色氨酸