which ion is required in Taq DNA pol activity ( )
A. K+
B. Na+
Ca2+
D. Mg2+
E. Cl-
查看答案
The largest family of membrane receptors is ( )
A. C protein-coupled receptor
B. G protein-coupled receptor
C. receptor-gated channels
D. enzyme-coupledreceptor
E. Ion-channel-coupled receptor
The chemical natures of most receptors are ( )
A. saccharides
B. glycerols
C. proteins
D. lipids
E. mineral
Protein kinase A is regulated by ( )
A. IP3
B. cGMP
Ca2+
DAG
E. cAMP
( ) will travel through the bloodstream to act on distant target cells.
A. Neurotransmitter
B. Paracrine
C. Autocrine signal
D. Cytokines
E. endocrine signal
微信支付 
支付宝支付