下载APP
举一反三
【单选题】真核细胞内的膜系统,如核膜、质膜与内质网膜相连,这种结构的特点说明内质 网的重要功能之一是( )
A.
扩大膜的面积
B.
提供细胞内物质运输通道
C.
核糖体附着的支架
D.
参与代谢反应
【单选题】在物质的跨细胞膜转运中，________是指物质从质膜的高浓度侧通过质膜分子间隙向低浓度侧进行的跨膜扩散。
A.
单纯扩散
B.
易化扩散
C.
主动转运
D.
膜泡运输
【单选题】Mars Global Surveyor is the oldest of five NASA robotic devices, which is designed to find out signs that Mars once had water;and it had been taking detailed pictures of the red planet for a decade. U...
A.
its life
B.
its orbit
C.
its power
D.
its position
【单选题】全麻药对脂质膜的相互作用，哪项是正确的()
A.
膜通透性增加及进入膜内水分增加
B.
膜容积增加，通道受挤压
C.
外界压力增加时细胞膜的侧向压力增加，促进通道关闭
D.
温度升高使膜容积增加
E.
使跨膜电场发生改变并使离子经通道流到膜外
【单选题】Kenya Wildlife Safari from ￡995DAY 1 LONDON/NAIROBIDaylight flight to Nairobi．On arrival, check in at the Holiday Inn Mayfair Court.DAY 2-4 SAMBURU AND TREETOPSSet off on safari, driving north, to the...
A.
traveling long distance
B.
spending nights outdoors
C.
watching animals in the wild
D.
seeing different kinds of plants