下列有关细胞生命历程中各种现象的叙述,错误的是( )
A:有丝分裂的不同时期,细胞内mRNA的种类及含量都相同
B:正常人体的浆细胞和胰岛B细胞的核基因相同,mRNA不完全相同
C:细胞衰老最终表现为细胞形态、结构和功能发生变化
D:细胞凋亡是细胞内的遗传物质所控制的,在生长发育中有重要作用
2012年和2016年的夏季奥运会分别在英国伦敦(51°30′N,0°7′W)和巴西的里约热内卢(22°54′S,43°12′W)举行,下面甲乙两图分别是当地的气候资料统计图。据此完成下面小题。
用一把刻度尺测某一物体的长度时,一般要测三次或更多次,这样做的目的是 ( )
Hello! My name is Zhou Aiguo. I'm from Wuhan. I live (居住) at Zhongshan Road. My English name is Tim. I like drawing pictures. I'm now studying at No. 1 Secondary School. Peter is my good friend. He is in Class 8, Grade 7. We are in the same class. My telephone number is 8329746. You can write letters to me. Remember (记住) my post code is three one zero zero one two. You can send e-mails to me. My address is ZhouAiguo@126.com. I like to be your friend.
Personal Information
Name: Zhou Aiguo. English name: Tim
Class: Class 8, Grade 7 School: ____
Home address: Zhongshan Road, Wuhan
E-mail address: ____
Phone: ____ Hobby: ____