下列关于限制酶的说法不正确的是( )
A:限制酶广泛存在于各种生物中,微生物中很少分布
B:一种限制酶只能识别一种特定的核苷酸序列
C:不同的限制酶切割DNA的切点不同
D:限制酶的作用是用来提取目的基因
Come and see the India elephants and the new tigers from Amercia. The bears are waiting to meet you, and the monkeys from China are waiting to throw things to you. The lovely dogs from Australia are waiting to laugh at you. The giraffes from Brazil are waiting to look down on(俯瞰)you.
Tickets Open time
Children :over 12 $1.00 Except(除)Friday
Under12 Free 10:00a.m—3:00p.m
Grown-up:(成人)$2.00 9:00a.m—4:00p.m
Keep the zoo clean!
Don't touch , give good food or go near the animals!
某同学学习了“种子萌发的外界条件”后,自己动手设计了一个实验。他将三粒大豆种子用细绳系在玻璃棒上,放在盛有水的烧杯中,实验装置如图所示。请回答下列问题: