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Questions and Answers
Which of the following proteins promotes lamellipodia and filopodia formation?
Which of the following proteins promotes lamellipodia and filopodia formation?
- Rho, Rac, Cdc42 (correct)
- Fascin and Villin
- Filamin
- All of the above
Microtubules are inherently unstable unless they____.
Microtubules are inherently unstable unless they____.
- bind to cap proteins (correct)
- are stabilized by minus end attachments.
- are bound to kinesin.
- are assembled in the nucleus.
Most microtubules are made up of 13 ___________ that are linear chains of ____and _____ dimers.
Most microtubules are made up of 13 ___________ that are linear chains of ____and _____ dimers.
- tubulin centrioles; gamma tubulin
- actin rings; alpha and beta tubulin
- protofilaments; alpha and beta tubulin (correct)
- microfilaments; gamma and beta tubulin
Shown below is a diagram of a centrosome and associated microtubules. What is the identity of the structure in red, indicated by the black dashed arrow?
Shown below is a diagram of a centrosome and associated microtubules. What is the identity of the structure in red, indicated by the black dashed arrow?
At the leading edge of a cell, ARP proteins help form new branches on actin filaments to push the leading edge forward using the force of the polymerization, as shown in the figure below. What type of structure is being formed?
At the leading edge of a cell, ARP proteins help form new branches on actin filaments to push the leading edge forward using the force of the polymerization, as shown in the figure below. What type of structure is being formed?
Which of the following motor proteins has one head domain, moves along actin toward the plus end, and is found in all cell types?
Which of the following motor proteins has one head domain, moves along actin toward the plus end, and is found in all cell types?
Which end of a microtubule assembles more rapidly?
Which end of a microtubule assembles more rapidly?
The absence of ADP and ATP causes______.
The absence of ADP and ATP causes______.
Calcium is released from the___upon t-tubule activation.
Calcium is released from the___upon t-tubule activation.
Which of the following images shows microtubules? A=left, B=middle, C=right
Which of the following images shows microtubules? A=left, B=middle, C=right
Study Notes
Microtubules and Cell Motility
- ARP proteins promote lamellipodia and filopodia formation at the leading edge of a cell.
- Microtubules are inherently unstable unless they are capped at their plus end.
- Most microtubules are made up of 13 protofilaments that are linear chains of α-tubulin and β-tubulin dimers.
- The structure in red, indicated by the black dashed arrow in the diagram, is a centriole.
- ARP proteins help form new branches on actin filaments to push the leading edge forward using the force of polymerization.
- The type of structure being formed at the leading edge is lamellipodia or filopodia.
- The motor protein that has one head domain, moves along actin toward the plus end, and is found in all cell types is Myosin I.
- The plus end of a microtubule assembles more rapidly.
- The absence of ADP and ATP causes microtubule depolymerization.
- Calcium is released from the sarcoplasmic reticulum upon t-tubule activation.
- Image C (right) shows microtubules.
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