Short regions of α helix are especially abundant in proteins that are embedded in cell __________, such as transport proteins and receptors.

The receptors for EGF, NGF, IGF and PDGF are essentially enzymes.

The receptors for EGF, NGF, IGF and PDGF are essentially enzymes. A: 正确 B: 错误

Tachycardia is more common observed in phentolamine than prazosin because the former A: has some M-agonist action B: has some β1-agonist action C: blocks postsynaptic α₂-receptors D: blocks presynaptic α₂-receptors E: stimulates heart directly

Which receptors do not adapt at all or adapt slowly A: tactile B: nociceptors C: smell D: taste

Which of the following components can be recognized by phages as receptors for Escherichia coli? (). A: Lipopolysaccharide B: Peptidoglycan C: Flagellum D: Pili

The envelope of an animal virus is derived from the ______ of its host cell. A: cell wall B: glycoproteins C: membrane D: receptors

The envelope of an animal virus is derived from the ( ) of its host cell. A: cell wall B: membrane C: glycocalyx D: receptors

It can be inferred from the passage that______. A: scientists have discovered the working mechanism of the nose B: humans detect odors with a large number of receptors responsive to the odorous molecules themselves C: the receptors integrate various responses to the characteristics of an odor and store them in the brain D: e-noses operate on principles totally different from those of a real nose

The envelope of an animal virus is derived from the____of its host cell.( ) A: cell wall B: cell membrane C: glycolyx D: receptors