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【单选题】
Definition of Kinesin ( )A.
It is a major site in which t he γ-tubulin s combine with several other associated proteins to act as a scaffold for α - β tubulin dimers during the nucleation process .
B.
It is a cytoskeletal component composed of a family of related proteins sharing common structural and sequence features , which are cytoplasmic and nuclear localization .
C.
It is composed of a double-helical polymer of the protein actin, and play s a key role in virtually all types of contractility and motility within cells.
D.
It comprise s a superfamily of ATP -dependent motor proteins which are responsible for actin -based motility.
E.
It is composed of three distinct types of fibrous structures: microtubules, intermediate filaments, and microfilaments, which participate in a number of cellular activities.
F.
It is a protein belonging to a class of motor proteins found in eukaryotic cells . Most of them walk towards the positive /minus end of a microtubule .
G.
It is a family of cytoskeletal motor proteins that move toward the microtubules' plus end .
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【简答题】分配(按生产工人工作比例)并结转本月制造费用,填入下表。 产品名称 分配标准(生产工人工资) 分配率 分配金额 A 产品 B 产品 合计
【单选题】用过滤机处理某悬浮液,先等速过滤20min,得到滤液2m3,随即保持当时的压差等压过滤40min,则共得到多少滤液(忽略介质阻力)?
A.
2.47
B.
3.47
C.
4.47
D.
6.47
【多选题】共阳极译码驱动芯片（7447）驱动共阴极数码管（sm4205）时
A.
输入0001，显示E
B.
输入0001，显示1
C.
输入1000，显示8
D.
输入0111，显示9
E.
输入0011，显示1（位置偏移）
F.
无论输入什么，数码管都不亮
【单选题】如果把人类诞生以来的300多万年比作一天，那么前面23个多小时，人类都在________ 中，依靠采集植物和狩猎动物来维生。直到23点55分钟，才开始种植粮食和饲养家畜，有了家的________。农业的诞生与发展，不仅为人类提供了丰富的食物来源，更是促进了社会复杂化 和文明的起源。 依次填入划横线部分最恰当的一项是：
A.
颠沛流离概念
B.
风餐露宿安稳
C.
居无定所港湾
D.
东奔西走欲求
【单选题】某船开始看见灯塔在南偏东30°方向，后来船沿南偏东60°的方向航行45km后，看见灯塔在正西方向，则这时船与灯塔的距离是（ ）
A.
15 3 km
B.
30km
C.
15km
D.
15 2 km
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