1|Page
CELL BIOLOGY 112 EXAM 2 PCC EXAM LATEST 2026-2027 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY GRADED A+|
||PROFESSOR VERIFIED|| ||BRANDNEW!!!||
For kinesin motors, the direction of movement along a
microtubule is specified by the motor's: - ANSWER-neck region
Which of the following membrane-associated proteins in platelets
(thrombocytes) crosslink cellular actins in blood clot formation? -
ANSWER-Gp1b-IX
the plasma membrane of eukaryotic cells is supported by: -
ANSWER-actin filaments
Which of the following is FALSE? - ANSWER-The myosin with the
largest step size is myosin II, which is used for muscle
contraction.
Intermediate filaments are distinct from microtubules in all of the
following EXCEPT: - ANSWER-intermediate filaments are more
dynamic
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All of the following statements about actin assembly are correct
EXCEPT: - ANSWER-actin (-) ends assemble more rapidly than
actin (+) ends.
Microtubule assembly requires: - ANSWER-a tubulin
concentration in excess of the Cc (critical concentration)
Which of the following is NOT a function of myosin-powered
movements? - ANSWER-flagellum-mediated cell motility
Which of the following is true of both kinesin and dynein? -
ANSWER-Both are two-headed motor proteins
Membrane extension during cell locomotion is driven by: -
ANSWER-actin polymerization
The EB1 protein has several functions. Which statement is TRUE
regarding EB1? - ANSWER-It can bind further back from the blunt
end of microtubules.
, 3|Page
Other microtubule plus-end tracking proteins use EB1 to
"hitchhike" onto the growing microtubule.
It promotes microtubule growth by enhancing polymerization at
the (+) end.
At ATP-G-actin concentrations that are intermediate between the
Cc for the (+) end and the Cc for the (-) end,
________will be observed. The Cc needed for elongation at the
(+) end is _____ than that at the (-) end of actin microfilaments. -
ANSWER-treadmilling; lower
Lamellipodia are located: - ANSWER-at a moving cell's leading
edge
Which of the following is a G-actin sequestering protein that
allows cells to maintain a relatively high G-actin concentration in
cells? - ANSWER-Thymosin β4
CELL BIOLOGY 112 EXAM 2 PCC EXAM LATEST 2026-2027 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS (100% VERIFIED ANSWERS) |ALREADY GRADED A+|
||PROFESSOR VERIFIED|| ||BRANDNEW!!!||
For kinesin motors, the direction of movement along a
microtubule is specified by the motor's: - ANSWER-neck region
Which of the following membrane-associated proteins in platelets
(thrombocytes) crosslink cellular actins in blood clot formation? -
ANSWER-Gp1b-IX
the plasma membrane of eukaryotic cells is supported by: -
ANSWER-actin filaments
Which of the following is FALSE? - ANSWER-The myosin with the
largest step size is myosin II, which is used for muscle
contraction.
Intermediate filaments are distinct from microtubules in all of the
following EXCEPT: - ANSWER-intermediate filaments are more
dynamic
,2|Page
All of the following statements about actin assembly are correct
EXCEPT: - ANSWER-actin (-) ends assemble more rapidly than
actin (+) ends.
Microtubule assembly requires: - ANSWER-a tubulin
concentration in excess of the Cc (critical concentration)
Which of the following is NOT a function of myosin-powered
movements? - ANSWER-flagellum-mediated cell motility
Which of the following is true of both kinesin and dynein? -
ANSWER-Both are two-headed motor proteins
Membrane extension during cell locomotion is driven by: -
ANSWER-actin polymerization
The EB1 protein has several functions. Which statement is TRUE
regarding EB1? - ANSWER-It can bind further back from the blunt
end of microtubules.
, 3|Page
Other microtubule plus-end tracking proteins use EB1 to
"hitchhike" onto the growing microtubule.
It promotes microtubule growth by enhancing polymerization at
the (+) end.
At ATP-G-actin concentrations that are intermediate between the
Cc for the (+) end and the Cc for the (-) end,
________will be observed. The Cc needed for elongation at the
(+) end is _____ than that at the (-) end of actin microfilaments. -
ANSWER-treadmilling; lower
Lamellipodia are located: - ANSWER-at a moving cell's leading
edge
Which of the following is a G-actin sequestering protein that
allows cells to maintain a relatively high G-actin concentration in
cells? - ANSWER-Thymosin β4
