Module 3 Chapter 17 Multiple choice questions 17.7

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. Which of the following correctly describes how signalling molecules act in paracrine signalling?

Signalling molecules act back on the same cell which produced them. correct incorrect

Signalling molecules are released from one cell and travel to a nearby target cell by diffusion through the extracellular fluid. correct incorrect

Signalling molecules are instead expressed on the cell surface, where they meet adjacent target cells by direct cell-to-cell contact. correct incorrect

Signalling molecules travel to remote target cells via the blood stream. correct incorrect

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. The receptors used in cell signalling can be grouped into four ‘super families’. The members of which of the following groups respond to signalling molecules that can pass directly through the cell membrane unaided?

G-protein-coupled receptors correct incorrect

Kinase-linked receptors correct incorrect

Ligand-gated ion channels correct incorrect

Steroid receptors correct incorrect

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. Which of the following correctly describes the initial action after binding an appropriate ligand to a kinase-linked receptor?

Addition of a methyl group to either the receptor itself or an associated target protein correct incorrect

Addition of a phosphate group to either the receptor itself or an associated target protein correct incorrect

Removal of a methyl group from either the receptor itself or an associated target protein correct incorrect

Removal of a phosphate group from either the receptor itself or an associated target protein correct incorrect

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