CELL PHYS TEST 3 |2024 COMPLETE QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS ) A RATED.
What would you expect to happen to a cell with a high proportion of
phosphatidylserine on the exoplanet face of the membrane? -
ANSWER -It would undergo apoptosis
Small transient structures rich in sphingomyelin and cholesterols that
concentrate particular proteins in the membrane are called __?__ -
ANSWER -Lipid rafts
Which group of transmembrane proteins selectively bind to particular
molecules & transport them down their concentration gradient? -
ANSWER -Carrier proteins
What type of ion channel opens in response to a change in electrical
charge across the membrane in which it sits? - ANSWER -
Voltagegated
The movement of which ion across the membrane contributes most to
the resting membrane potential? - ANSWER -Potassium
How many molecules of Na+ and K+ are moved across the membrane
by the Na+/K+ pump and in which direction? - ANSWER -3 Na+ out
and 2 K+ in
, What is the major functional difference between primary active and
secondary active transporters? - ANSWER --Primary active transport
proteins directly hydrolysis ATP to fuel active transports.
-Secondary active transport proteins use the steep sodium gradient
established by the Na+/K+ pump to fuel transport of molecules.
Which type of endocytosis is an example of a clathrin-independent
mechanism? - ANSWER -Macropinocytosis
Membrane receptors engulfed during endocytosis are most often
__?__ - ANSWER -Recycled
Which phospholipids are most commonly found on the cytosolic face
of the plasma membrane? - ANSWER --Phosphatidycholine
-Phosphatidyserine
-Phosphatidylethanolamine
-Sphingomyelin
What is the importance of having ATP bound to a G-actin monomer as
opposed to ADP? - ANSWER --ATP bound G-actin is more stable &
more likely to polymerize (good)
-ADP bound G-actin is more likely to dissociate from the filament
(Bad)
Actin—based cell surface extensions that are stable, not exploratory,
are called __?__ - ANSWER -Microvilli
ANSWERS (VERIFIED ANSWERS ) A RATED.
What would you expect to happen to a cell with a high proportion of
phosphatidylserine on the exoplanet face of the membrane? -
ANSWER -It would undergo apoptosis
Small transient structures rich in sphingomyelin and cholesterols that
concentrate particular proteins in the membrane are called __?__ -
ANSWER -Lipid rafts
Which group of transmembrane proteins selectively bind to particular
molecules & transport them down their concentration gradient? -
ANSWER -Carrier proteins
What type of ion channel opens in response to a change in electrical
charge across the membrane in which it sits? - ANSWER -
Voltagegated
The movement of which ion across the membrane contributes most to
the resting membrane potential? - ANSWER -Potassium
How many molecules of Na+ and K+ are moved across the membrane
by the Na+/K+ pump and in which direction? - ANSWER -3 Na+ out
and 2 K+ in
, What is the major functional difference between primary active and
secondary active transporters? - ANSWER --Primary active transport
proteins directly hydrolysis ATP to fuel active transports.
-Secondary active transport proteins use the steep sodium gradient
established by the Na+/K+ pump to fuel transport of molecules.
Which type of endocytosis is an example of a clathrin-independent
mechanism? - ANSWER -Macropinocytosis
Membrane receptors engulfed during endocytosis are most often
__?__ - ANSWER -Recycled
Which phospholipids are most commonly found on the cytosolic face
of the plasma membrane? - ANSWER --Phosphatidycholine
-Phosphatidyserine
-Phosphatidylethanolamine
-Sphingomyelin
What is the importance of having ATP bound to a G-actin monomer as
opposed to ADP? - ANSWER --ATP bound G-actin is more stable &
more likely to polymerize (good)
-ADP bound G-actin is more likely to dissociate from the filament
(Bad)
Actin—based cell surface extensions that are stable, not exploratory,
are called __?__ - ANSWER -Microvilli
