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Biology exam 2 CH 7
bio
15
Biology
Undergraduate 1
10/04/2017

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Term
autocrine
juxtacrine
paracrine
hormones
Definition
chemical cell signals
Term
autocrine
Definition
signals affect the cells that made them
Term
juxtarine
Definition
signals affect only
adjacent cells.
Term
paraccrine
Definition
signals affect nearby cells
Term
hormones
Definition
travel to distant cells,
usually via the circulatory system.
Term
signal transduction pathway
Definition
is the
sequence of events that lead to a
cell’s response to a signal.
Term
crosstalk
Definition
Signal transduction
pathways can be interrelated.
Term
receptor, ligands
Definition
____ proteins have very specific
binding sites for chemical signal
molecules, or _____.
Term
dissociation constant
Definition
KD is the ____________, a
measure of the affinity of the receptor
for its ligand.
Term
agonists
Definition
have the same effect as
the ligand.
Term
antagonists
Definition
(inhibitors) bind to the
receptor and prevent the ligand from
binding.
Term
ion channel receptors
Definition
allow ions to
enter or leave a cell.
Term
protein kinase receptors
Definition
catalyze
phosphorylation of themselves and/or
other proteins.
Term
G protein coupled receptors
Definition
Signal
binding to receptor activates a G
protein, which then activates an
effector protein.
Term
intracellular receptors
Definition
respond to
signals such as light or chemicals
that can cross the cell membrane.
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