细胞质泵动学说 ( cytoplasmic pumping theory )

Choose the correct sentence below. A: First nuclear division, then cytoplasmic Division B: First, the cytoplasm is divided, then the nucleus is divided C: Simultaneous nuclear and cytoplasmic Division D: Only nuclear division

Which words have different meaning as extranuclear inheritance: A: Mendelian inheretance B: extra-chromosomal inheritance C: cytoplasmic inheritance D: maternal inheritance

Which words have different meaning as extranuclear inheritance: ( ) A: Mendelian inheritance B: extra-chromosomal inheritance C: maternal inheritance D: cytoplasmic inheritance

Immature thymocytes (DN developing T cells) share what surface proteins with germ cells <br/>and neural crest cells? A: the C-Kit receptor B: class II MHC molecules C: B7 D: the cytoplasmic signaling peptides (ζ, ε, etc.) of the CD3 E: CD8 and CD4

Which function is not a tight junction? A: The mechanical action of tightly integrating epithelial cells. B: It determines the direction of material transport. C: To limit the free diffusion of larger molecules at the top and base side of the epithelium cytoplasmic membrane. D: It mediates cellular interactions that are regulated by calcium ions.

关于桥粒连接，下列叙述中哪项是错误的 A: 是细胞间一种紧密连接结构，有强的抗张和抗压作用 B: 在上皮细胞位于粘着带下方，相邻细胞间有30nm的间隙 C: 桥粒区胞质面有盘状致密的粘着斑(adhesion plaque) D: 跨膜连接糖蛋白附于胞质斑(cytoplasmic plaque)上