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【简答题】
读“美国山脉、水系图”，回答下列问题： （1）写出图中数字表示的海域：① ② ③ （2）写出图中字母表示的地理事物名称： 山脉：A B 河流、湖泊：C E
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皮皮学刷刷变学霸
举一反三
【单选题】The passage is mainly concerned with ______.
A.
the feasibility of life existing on other planets
B.
the description of Mars's physical environment
C.
the comparison between the physical features of Mars and the Earth
D.
the feasibility of men's migrating onto Mars
【单选题】Which is not the chemical component of microtubule?
A.
a-tubulin
B.
β-tubulin
C.
histone
D.
microtubule associated proteins(MAP)
【判断题】Other microtubule plus-end tracking proteins may use EB1 to “hitchhike” onto the growing microtubule.
A.
正确
B.
错误
【简答题】微管组织中心(microtubule organizing center)
【单选题】Which description about microtubule and MTOC is false?
A.
MTOC is the specialized organizing center for microtubule growing
B.
The best studied MTOC is the centrosome in plant cells.
C.
The γ-tubulin ring of MTOC serves as the starting point or nucleation site for the growth of one microtubule.
D.
The plus end of each microtubule face outward where further growth can occur.
【简答题】微管(microtubule)
【单选题】About the assembling of microtubule, which is correct?
A.
dimer→protofilament→α、βtubulin→microtubule
B.
α、βtubulin → dimer → protofilament → 13 protofilament →microtubule
C.
α、βtubulin → 13 protofilament →microtubule
D.
α、βtubulin → dimer → protofilament →microtubule
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