Which of the following proteins is not polar? a. A tubulin heterodimer b. A micr

ID: 68026 • Letter: W

Question

Which of the following proteins is not polar?

a. A tubulin heterodimer

b. A microtubule

c. An actin filament

d. An intermediate filament subunit (a monomer)

e. A tetramer of intermediate filament subunits

Which of the following microtubules is most likely to be shrinking (i.e. tubulin subunits are dissociating from it)?

a. GTP-bound tubulin is bound at the plus end of the microtubule

b. GDP-bound tubulin is bound at the plus end of the microtubule

c. The microtubule is bound to a capping protein

d. The cell has been treated with taxol

Which of the following depend on dynein for their location in the cell?

a. The nuclear lamina

b. The endoplasmic reticulum

c. A synaptic vesicle that is translated in the cell body of a neuron

d. The Golgi apparatus

The function of the monomer-sequestering proteins such as thymosin in the cell is___

a. To prevent actin monomers from spontaneously forming actin

filaments

b. To nucleate the assembly of actin filaments

c. To promote branching of actin filaments

d. To bind to the cell cortex

Cytoskeletal filaments drive the leading edge of a lamellipodium forward by___

a. The movement of dynein along the filaments

b. The movement of myosin along the filaments

c. The assembly of actin filaments at the front, towards the membrane, and the disassembly of actin filaments further back

d. The assembly of microtubules at the front, towards the membrane, and the disassembly of microtubules further back

Which of the following proteins is not polar

A = Tubulin heterodimer ; tubulin assesmbly is polar in nature not the subunits.

Which of the following depend on dynein for their location in the cell?

A = Endoplasmic reticulum; the vesicles emerging from ER are carried by dynein.

Cytoskeletal filaments drive the leading edge of a lamellipodium forward by-

A = The assembly of actin filaments at the front, towards the membrane, and the disassembly of actin filaments further back

Which of the following microtubules is most likely to be shrinking (i.e. tubulin subunits are dissociating from it)

A = b. GDP-bound tubulin is bound at the plus end of the microtubule

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