Exam 3 Bio 272 Questions with correct
Answers
Transcription factors - Correct Answers -bind to specific DNA regulatory sites to
promote (or inhibit) transcription of specific target genes.
RGS protein - Correct Answers -regulator of G protein signaling, protein can act as a
GAP on the α subunit of the G protein to increase the rate of hydrolysis.
Adenylyl cyclase - Correct Answers -converts ATP into cyclic amp
Sarcoplasmic reticulum - Correct Answers -is a specialized ER found in muscle cells,
contains a very high concentration of Ca2+, muscle contraction is triggered by sudden
release of Ca2+ from here into the cytosol in response to a signal from a motor nerve.
Tropomysosin - Correct Answers -binds along the groove of an actin filament,
specifically blocking the Myosin II binding sites
Troponin - Correct Answers -interacts with the end of a Tropomyosin molecule and
contains a Ca2+ sensitive protein
lamellipodia - Correct Answers -actin meshwork at leading edge of cell, nucleated by
Arp2/3, Rac1 promotes the formation of these
Phospholipase C - Correct Answers -inositol triphosphate and diacylglycerol
cyclic AMP (cAMP) - Correct Answers -Activates protein kinsase A (PKA)
diacylglycerol (DAG) - Correct Answers -activates protein kinase C (PKC)
inositol triphosphate (IP3) - Correct Answers -opens Ca2+ channels in the ER
Actin filaments - Correct Answers -Cell shape, cell migration, cytokinesis
Microtubules - Correct Answers -organelle position, intracellular traffic, mitosis
Intermediate filaments - Correct Answers -mechanical strength
Transverse tubules (t-tubules) - Correct Answers -invaginate inward from the plasma
membrane toward each myofibril, transmit the action potential from a motor neuron to
the sarcoplasmic reticulum.
Answers
Transcription factors - Correct Answers -bind to specific DNA regulatory sites to
promote (or inhibit) transcription of specific target genes.
RGS protein - Correct Answers -regulator of G protein signaling, protein can act as a
GAP on the α subunit of the G protein to increase the rate of hydrolysis.
Adenylyl cyclase - Correct Answers -converts ATP into cyclic amp
Sarcoplasmic reticulum - Correct Answers -is a specialized ER found in muscle cells,
contains a very high concentration of Ca2+, muscle contraction is triggered by sudden
release of Ca2+ from here into the cytosol in response to a signal from a motor nerve.
Tropomysosin - Correct Answers -binds along the groove of an actin filament,
specifically blocking the Myosin II binding sites
Troponin - Correct Answers -interacts with the end of a Tropomyosin molecule and
contains a Ca2+ sensitive protein
lamellipodia - Correct Answers -actin meshwork at leading edge of cell, nucleated by
Arp2/3, Rac1 promotes the formation of these
Phospholipase C - Correct Answers -inositol triphosphate and diacylglycerol
cyclic AMP (cAMP) - Correct Answers -Activates protein kinsase A (PKA)
diacylglycerol (DAG) - Correct Answers -activates protein kinase C (PKC)
inositol triphosphate (IP3) - Correct Answers -opens Ca2+ channels in the ER
Actin filaments - Correct Answers -Cell shape, cell migration, cytokinesis
Microtubules - Correct Answers -organelle position, intracellular traffic, mitosis
Intermediate filaments - Correct Answers -mechanical strength
Transverse tubules (t-tubules) - Correct Answers -invaginate inward from the plasma
membrane toward each myofibril, transmit the action potential from a motor neuron to
the sarcoplasmic reticulum.
