已知AUG、GUG为起始密码子,UAA、UGA、UAG为终止密码子,某信使RNA的碱基排列顺序如下:AUUCGAUGAC——(40个碱基)——CUCUAGAUCU,此信使RNA控制合成的蛋白质中含有的肽键个数为 A.20 B.15 C.16 D.18 答案:B
There are over ________ students in our school.
[ ]
A.
five hundred of
B.
five hundreds
C.
five hundred
D.
five hundreds of