Microfilaments and microtubules are cytoskeletal elements that also function in
ID: 14546 • Letter: M
Question
Microfilaments and microtubules are cytoskeletal elements that also function in cell shape and cell movements. Determine whether each of the following statements describes microfilaments, microtubules, or both microfilaments and microtubules.polymer of globular subunits
structure is a double chain of subunits
monomers bind ATP
monomers bind GTP
13 protofilaments associate to form a hollow tube
dimers polymerize into protofilaments that then associate side by side
fibers polymerize and depolymerize quickly
subunits add more quickly to the (+) end than the (-) end
Explanation / Answer
polymer of globular subunits-BOTH
structure is a double chain of subunits-MICROFILAMENTS
monomers bind ATP-MICROFILAMENT
monomers bind GTP-MICROTUBULES
13 protofilaments associate to form a hollow tube-MICROTUBULES
dimers polymerize into protofilaments that then associate side by side-MICROTUBULES
fibers polymerize and depolymerize quickly-BOTH
subunits add more quickly to the (+) end than the (-) end-BOTH