What type of signaling works over great distances, for a long duration, and over a diffuse area? Compare and contrast endocrine and paracrine signaling. How do hormones travel to their targets in animal cells and in plant cells? What do cells use to communicate when they are in direct contact with one another? What are the three stages of the cell signaling process? Briefly describe each. Define the term Ligand. What is the difference between a protein kinase and a protein phosphatase? Draw a G-protein receptor and diagram its signaling cascade. Draw a Tyrosine-kinase receptor and diagram its signaling cascade. Draw a ligand-gated ion channel and diagram its signaling cascade. What types of molecules bind to intracellular receptors? When testosterone binds to a receptor in the cytoplasm, the complex goes into the nucleus of the cell and then does what? Sketch this intracellular receptor signaling cascade.
Added by Stephanie H.
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Step 1: Endocrine signaling works over great distances and for a long duration, while paracrine signaling works over a diffuse area in close proximity to the signaling cell. Show more…
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When a cell releases a signal molecule into the environment and a number of cells in the immediate vicinity respond, this type of signaling is a. typical of hormones. b. autocrine signaling. c. paracrine signaling. d. endocrine signaling. e. synaptic signaling. 7. The receptors for a group of signaling molecules known as growth factors are often a. ligand-gated ion channels. b. G-protein-linked receptors (GPCR). c. cyclic AMP (cAMP) d. receptor tyrosine kinases (Trk). e. neurotransmitters. 8. Binding of a signaling molecule to which type of receptor leads directly to a change in distribution of ions on opposite sides of the membrane? a. receptor tyrosine kinase b. G protein-coupled receptor c. phosphorylated receptor tyrosine kinase dimer d. ligand-gated ion channel e. intracellular receptor
Sri K.
The type of cell signaling in which a signal is secreted into the extracellular environment and acts locally on neighboring cells up to a few cell diameters away is called paracrine signaling. In contrast, endocrine signaling involves sending the signal, which in this case is called a hormone, to the entire body. An important class of signaling molecules called steroid hormones bind to the receptor proteins that translocate into the nucleus upon activation. A common regulatory mechanism in cell signaling is the addition of a phosphate to a target protein, which is carried out by enzymes called kinases. G proteins are activated when they bind a molecule of GTP. During G protein-coupled receptor signaling, one of the key activated proteins is the enzyme adenylyl cyclase, which makes cyclic AMP from ATP. A common mechanism of GPCR inactivation is internalization of the receptor from the cell surface. During the process, the receptor is incorporated into the endosome.
Dominador T.
Paracrine signaling is characterized by ligands that are a. produced by the cell itself. b. secreted by neighboring cells. c. present on the plasma membrane of neighboring cells. d. secreted by distant cells.
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