Which is not correct about the G protein（）
A. It can bind GTP or GDP
B. It is made up of α、βand γsubunits
C. G protein has the GTPase activity
D. G protein is active when the 3 subunits bind together
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About the membrane signal receptors, which statment is not correct（）
A. They can recognize the extracellular signal molecules
B. They can bind to the signal molecules and intitate the cellular responses
C. All membrane receptors are transmembrane glycoproteins
D. There are several different types of membrane receptors in the same cell membrane
There are some well-known theories about the origin of language, among which______ proposes an extremely specific connection between physical and oral gesture（）
A. the oral-gesture theory
B. the bow-wow theory
C. the pooh-pooh theory
D. the yo-he-ho theory
Chomsky made the distinction between___（）
A. competence and performance
B. comparative linguistics and historical linguistics
C. langue and parole
D. microlinguistics and macrolinguistics
holds that language originated from people’s imitations of animal cries and other sounds heard in nature（）
A. The pooh-pooh theory
B. The bow-wow theory
C. The divine-source theory
D. The yo-he-ho theory
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