皮皮学，免费搜题
登录
搜题
【简答题】
细胞分化是生物界普遍存在的生命现象,是生物_______________________的基础。细胞分化的原因主要是在生物个体发育的过程中,不同细胞中__________________的执行情况不同所致,有的基因处于________________状态,而有的基因处于_______________状态。细胞分化使多细胞生物体中的细胞趋于专门化,有利于提高各种______________________________________________的效率。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Read the following paragraph from the introduction [paragraphs 1-5]. Three years ago, he had an idea. His parents gave him a pair of Toms shoes for Christmas. When Toms sells a pair of shoes, the comp...
A.
How did Michael get the idea for his bakery?
B.
What kinds of cupcakes does Michael give away?
C.
Where did Michael learn to bake cupcakes?
D.
How many cupcakes does Michael sell each month?
【简答题】根据投影面和地球球面相切位置的不同,透视投影可分为三类:( )、( )、( )。
【简答题】根据投影面和地球球面相切位置的不同，透视投影可分为三类：正轴方位投影、（ ）、（ ）。
【单选题】It works like this. First you call up a blueprint, a ______ model on your computer screen and tinker with its shape and color where necessary.
A.
code
B.
digital
C.
coded
D.
digit
【简答题】阅读理解 Boys and Girls, lets begin our English class now. This time I want to talk about my family. Then I want you to say something about your family. There are seven people in my family. They are my pa...
【单选题】It works like this. First you call up a blueprint, a ______ model on your computer screen and tinker with its shape and color where necessary.
A.
code
B.
digital
C.
coded
相关题目：