Test 2 - 9 Quiz Questions Flashcards
(20 cards)
All of the following are cytoskeletal fibrous structures except?
Dynein filaments
Which of the following is not true of kinesins?
Each kinesin-1 molecule is a heterodimer
T/F Dynein move materials along microtubules in the plus direction
False
Select all which are features of a microtubule-organizing center (MTOC)
Control the number of microtubules
Control the number of protofilaments
Specifies the time and location of their assembly
Which of the following can be used to differentiate cilia and flagella
Their number and method of locomotion
Which of the following can be used to differentiate microtubules from intermediate filaments?
The polymers from which they are constructed
Their size
Functions include muscle contraction
Which best describes the structure of actin filaments (Microfilaments)?
Comprised of actin monomers polymerized in a helical filament
Which of the following is an example of non-muscle motility?
Cell Locomotion
Which of the following is not a cellular event involving actin filaments
Formation of nuclear lamina
T/F Kinesins move to the plus end of intermediate filaments
false
Which features would you expect to find in a microtubule-associated protein?
A domain for microtubule attachment
A domain that projects outward as a tail from the microtubule’s surface
Which of the following is an example of a plus end-directed microtubular motor?
kinesin -1
Which of the following is a true statement regarding Dynein?.
Implicated in the anterograde movement of microtubules .
Which of the following occur during the actinomyosin contractile cycle?
ATP is hydrolyzed prior to myosin binding to actin
ATP binding promotes release of actin by the myosin head
Release of a phosphate from the myosin active site triggers a conformational change
Which best describes the role of ϒ-tubulin in Micro tubule Nucleation?
Forms a ring-shaped template on which the first row of alpha/beta tubulin dimers assemble
T/F The centrosome is a complex structure that contains two barrel-shaped centrioles surrounded by amorphous, electron-dense pericentriolar material
True
Which of the following is NOT a type of Actin-Binding Protein?
Monomer-depolymerizing proteins
Which of the following proteins would not be found in an intermediate filament
Axoneme
Which of the following is true regarding skeletal muscle contraction?
The H and I-bands shrink during contraction
Some features of Actin polymerization are…
In low ATP concentration new actin monomers are added only to the plus end
