An example of signal transduction amplification that occurs as a result of a single receptor binding to a ligand is: a. The receptor is itself a receptor tyrosine kinase which becomes active and phosphorylates a substrate every 10 milliseconds. b. When the receptor causes a release of sequestered calcium stores in the endoplasmic reticulum. c. The universal change in a receptor when it binds to a ligand. d. Two of the above. None of the above.
Added by Kenneth L.
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signal transduction pathways involving phosphorylation of a series of proteins is generally associated with which of the following events? a. production of cAMP in the process of signal transduction b. structure changes to each protein in the series, leading to changes in function c. release of Ca 2+ into the cytosol d. activation of a ligand-gated ion channel e. binding of a hormone to an intracellular receptor
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During signal transduction (a) the cell converts an extracellular signal into an intracellular signal that leads to a change in some cell process (b) a signaling molecule directly activates or represses several genes (c) each enzyme catalyzes production of one molecule of product (d) enzymes in the signal cascade remain active until the last component of the pathway alters a cellular process (e) the signal is terminated by cyclic AMP
Binding of a signaling molecule to which type of receptor leads directly to a change in the distribution of substances on opposite sides of the membrane? (A) intracellular receptor (B) G protein-coupled receptor (C) phosphorylated receptor tyrosine kinase dimer (D) ligand-gated ion channel
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