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【单选题】
婴幼儿易患呼吸道感染的最主要免疫原因是（）A.
咳嗽反射差
B.
纤毛运动功能差
C.
分泌型IgA低下
D.
IgM低下
E.
细胞免疫功能低下
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举一反三
【简答题】mitosis
【简答题】mitosis (有丝分裂)
【简答题】作为拼箱运输人，货运代理人一般以自己的名义提供服务并签发自己的提单。
【多选题】How do different cytoskeletal assemblies carry out mitosis and cytokinesis?
A.
After the duplicated chromosomes have condensed, a pair of complex cytoskeletal machines assemble in sequence to carry out the two mechanical processes that occur in M phase.
B.
The mitotic spindle carries out nuclear division (mitosis), and, in animal cells and many unicellular eukaryotes, the contractile ring carries out cytoplasmic division (cytokinesis). Both structures disassemble rapidly after they have performed their tasks.
C.
The mitotic spindle is composed of microtubules and the various proteins that interact with them, including microtubule-associated motor proteins. In all eukaryotic cells, the mitotic spindle is responsible for separating the duplicated chromosomes and allocating one copy of each chromosome to each daughter cell.
D.
The contractile ring consists mainly of actin and myosin filaments arranged in a ring around the equator of the cell. It starts to assemble just beneath the plasma membrane toward the end of mitosis. As the ring contracts, it pulls the membrane inward, thereby dividing the cell in two. We discuss later how plant cells, which have a cell wall to contend with, divide their cytoplasm by a very different mechanism.
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