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【单选题】
Tony spent three years _____ Chinese before he went to China to study. [ ]A.
learn
B.
to learn
C.
learning
D.
learns
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举一反三
【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
【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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