UWL BIO 315 EXAM 3 QUESTIONS WITH
CORRECT ANSWERS
Unlike microtubules and microfilaments, intermediate filaments can grow from the
middle. - Correct Answers -true
If a dimeric myosin with a small protein cargo attached to the cargo binding site
interacts with a stable, fixed microfilament, which of the following events is most likely to
happen? - Correct Answers -The myosin and bound cargo will move to the "+" end of
the microfibril.
The "+" end of a microtubule carries a net positive charge relative to the "-" end. -
Correct Answers -false
The actin webs created to form and support the lamelipodia and pseudopdia of cells are
formed by which complex: - Correct Answers -Arp2/3 Complex
Muscle contraction in multicellular animals is a complex process, but at the core, the
contraction of muscles is similar to a much simpler process that occurs in most cells.
Which of the following processes is the simpler equivalent to muscle fiber contraction -
Correct Answers -Contraction of anti-parallel microfilaments in stress fibers
Which of the following cytoskeleton-related proteins is a GTPase? - Correct Answers -
Tubulin
Which of the following is NOT one of the functions of the cytoskeleton in cells?
A) tracks for motor proteins carrying cargo
B)all of these are functions
C) determining cell shape and structure
D) organization of cytosol
E) acting as a basis for cellular motility - Correct Answers -all of these are functions
CORRECT ANSWERS
Unlike microtubules and microfilaments, intermediate filaments can grow from the
middle. - Correct Answers -true
If a dimeric myosin with a small protein cargo attached to the cargo binding site
interacts with a stable, fixed microfilament, which of the following events is most likely to
happen? - Correct Answers -The myosin and bound cargo will move to the "+" end of
the microfibril.
The "+" end of a microtubule carries a net positive charge relative to the "-" end. -
Correct Answers -false
The actin webs created to form and support the lamelipodia and pseudopdia of cells are
formed by which complex: - Correct Answers -Arp2/3 Complex
Muscle contraction in multicellular animals is a complex process, but at the core, the
contraction of muscles is similar to a much simpler process that occurs in most cells.
Which of the following processes is the simpler equivalent to muscle fiber contraction -
Correct Answers -Contraction of anti-parallel microfilaments in stress fibers
Which of the following cytoskeleton-related proteins is a GTPase? - Correct Answers -
Tubulin
Which of the following is NOT one of the functions of the cytoskeleton in cells?
A) tracks for motor proteins carrying cargo
B)all of these are functions
C) determining cell shape and structure
D) organization of cytosol
E) acting as a basis for cellular motility - Correct Answers -all of these are functions
