题目内容

which ion is required in Taq DNA pol activity ( )

A. K+
B. Na+
Ca2+
D. Mg2+
E. Cl-

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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

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