在蛋白质生物合成中,催化肽键形成的酶是
A.转肽酶
B.氨基肽酶
C.羧基肽酶
D.氨基酸合成酶
E.氨基酸连接酶
参考答案:A
解析:催化蛋白质肽键形成的是核蛋白体大亚基上的转肽酶。
The boss was _____ with the speech _____ by the graduate. Thus, he determined to give him a job offer.
A.impressed; delivered
B.impressing; delivered
C.impressed; confirmed
D.impressing; confirmed
已知函数f(x)=x2-(a+2)x+alnx+2a+2,其中a≤2.
(Ⅰ)求函数f(x)的单调区间;
(Ⅱ)若函数f(x)在(0,2]上有且只有一个零点,求实数a的取值范围.