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【单选题】
External economies of scaleA.
may be associated with a perfectly competitive industry
B.
cannot be associated with a perfectly competitive industry.
C.
tends to result in one huge monopoly.
D.
tends to result in large profits for each firm.
E.
None of the above
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【单选题】If the nerve supply to a newt limb is severed before amputation, how will this affect regeneration?
A.
A blastema will form but will not grow, and regeneration will fail.
B.
No regeneration occurs, and the stump heals over as it would in a mammal.
C.
Outgrowth will occur, but the identity of the limb will be lost and normal proximo-distal patterning will not occur.
D.
Regeneration of most tissues will occur normally, but regeneration of the nerves will not occur.
【判断题】After they sold the only car they owned, they felt uncertain how they might be able to maintain a relatively normal life without it.
A.
正确
B.
错误
【判断题】After they sold the only car they owned, they felt uncertain how they might be ale to maintain a relatively normal life without it.
A.
正确
B.
错误
【判断题】After they sold the only car they owned, they felt uncertian how they might be able to maintian a relatively normal life without it.
A.
正确
B.
错误
【单选题】糖酵解、糖异生、磷酸戊糖途径、糖原合成和糖原分解各条代谢途径交汇点的化合物是:
A.
葡糖-1-磷酸
B.
葡糖- 6-磷酸
C.
果糖-1,6-二磷酸
D.
果糖-6-磷酸
【单选题】糖酵解、糖异生、磷酸戊糖途径、糖原合成和糖原分解途径的共同代谢物是( )
A.
6-磷酸果糖
B.
1-磷酸葡萄糖
C.
3-磷酸甘油醛
D.
6-磷酸葡萄糖
E.
1,6-二磷酸果糖
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