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Cell Communication Chapter 9 set 1

front 1 ________ is the process through which cells can detect and respond to signals in their extracellular environment.	back 1 Cell communication
front 2 Which of the following types of molecules is LEAST involved in cell communication?	back 2 carbohydrates
front 3 A substrate binds an enzyme as a signal molecule binds a	back 3 receptor
front 4 During exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which would represent the yeast cell response?	back 4 both increased membrane glucose transporters and glucose transport into the cell

front 5 During exposure to elevated glucose, a yeast cell's membrane glucose transporters will rapidly increase so the cell can import glucose. Which would represent the signal for the yeast cell?	back 5 glucose
front 6 What type of cell communication is said to occur if a cell secretes a growth factor that then acts on neighboring cells to cause them to proliferate?	back 6 paracrine signaling
front 7 What type of signaling occurs when insulin is secreted from the pancreas and acts on muscle cells to increase glucose uptake?	back 7 endocrine signaling
front 8 What do we call molecules involved in long-distance signaling?	back 8 hormones

front 9 Which of the following represents a long-distance signaling mechanism?	back 9 endocrine signaling
front 10 What do synaptic signaling and paracrine signaling have in common?	back 10 Cells release a signal that affects neighboring cells.
front 11 Which of the following is not a common way signals are relayed between cells?	back 11 A. Contact-dependent signaling B. Autocrine signaling C. Direct intercellular signaling D. Paracrine signaling
front 12 The KD or dissociation constant between a receptor and its hormone/ligand is	back 12 both a measure of the binding affinity the receptor has for the hormone and the hormone concentration where half the receptors are bound to hormone.

front 13 What do G-protein coupled, enzyme-linked, and ligand-gated ion channel receptors have in common?	back 13 A. They are all linked to protein kinase activation. B. They associate with protein bound to guanidine phosphates. C. They open ion channels. D. They bind similar hormones.
front 14 A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to turning the key?	back 14 conformational change in the receptor once bound to the hormone
front 15 A key is placed into a keyhole then turned and the door opens. Which of the following components of cell signaling would best correspond to the keyhole?	back 15 the receptor
front 16 Once bound to a hormone, this receptor becomes active and catalyzes the transfer of a phosphate group to itself or intracellular proteins.	back 16 enzyme-linked receptor

front 17 Which of the following order of events is most accurate for activation of G-protein coupled receptor (GPCR) signaling pathways?	back 17 Hormone binds GPCR, GPCR binds with G protein, G protein loses GDP and gains GTP, G-protein alpha subunit activates intracellular proteins.
front 18 Following its initial activation, how does a G protein become inactivated?	back 18 The G-protein a subunit GTP is hydrolyzed to GDP allowing reassociation of the G-protein asubunit and bgdimer.
front 19 A G-protein coupled receptor associates with a G protein that contains how many subunits?	back 19 3
front 20 Which of the following is TRUE of ligand-gated ion channels?	back 20 They open upon binding the ligand to allow specific ions to pass through them.