Chapter 11 - Cell Communication

In a signal transduction phase, phosphatases
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In a signal transduction phase, phosphatases
inactivate protein kinases and turn off the signal transduction
For a protein to be an integral membrane protein, it would have to be _____.
amphipathic, with at least one hydrophobic region.
A G-protein receptor with GTP bound to it _____.
is in its active state
steroids hormones like testosterone, estrogen, and cortisol are lipids. The receptors for steroid hormones are located inside the cell instead of on the membrane surface like most other signal receptors. This is not a problem for steroids because
steroid hormones can readily diffuse through the lipid bilayer of the cell membrane.
which of the following correctly describes the order of the cell signal pathway?
reception, transduction, response.
paracrine signaling is characterized by ligands that are
secreted by neighboring cells.
one of the major categories of receptors in the plasma membrane reacts by forming dimers, adding phosphate groups, and then activating relay proteins. Which type does this?
receptor tyrosine kinase.
binding of a signaling molecule to which type of receptor leads directly to facilitated diffusion of ions from one side of a membrane to another?
ligand gated ion channel.
Image: binding of a signaling molecule to which type of receptor leads directly to facilitated diffusion of ions from one side of a membrane to another?
phosphorylation cascades involving a series of protein kinases in which each protein kinase molecule activates multiple molecules of the next protein in the sequence are useful for cellular signal transduction because they
amplify the original signal many times.
a ligand can produce a response in a cell if the cell has the correct
receptor