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AP Bio
4.3 Signal Transduction (II)
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Nana Hemans
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Cards (11)
The environment is not
static
and organisms need to regulate
pathways
to respond to changes in the environment.
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The ability to respond to
stimuli
is a necessary characteristic of life and key for survival.
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Signal transduction may result in changes in
gene expression
and
cell function.
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Signaling pathways
can change the amount of a particular protein produced and can also alter gene expression.
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Changes in protein type and/or amount can result in a
phenotype
change.
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Apoptosis
(cell death/suicide) can be a response of signal transduction.
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Signal Transduction can be used to respond to changes in the
environment.
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Quorum sensing
is a signal mechanism used by bacteria.
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In Quorum sensing bacteria releases signals to neighboring bacteria.
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Quorum
Sensing
is used to detect changes in
population density
so that food doesn’t run out and energy can be shared well enough (within a bacteria colony)
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Quorum Sensing allows bacteria to act as a group and respond to changes in the environment.
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