A.) Microfilaments are composed of globularsubunits of the protein actin. In the presence of ATP actinpolymerizes to form helical filaments. Briefly describe the role ofATP and how necessary for microfilament assembly.
B.) All of the motors known to operate inconjunction with actin filaments are members of the myosinsuperfamily. Name the two major categories of myosin and their maindifferences.
C.) A cell is treated with a fluorescentlylabeled antibody against a specific form of myosin. In thefluorescence microscope, the antibody can be seen immediatelyunderlying the cell membrane and associated with somemembrane-bound organelles. What kind of myosin is it likely to be?Would this cell be able to carry out cytokinesis in the presence ofthese antibodies?
A.) Microfilaments are composed of globularsubunits of the protein actin. In the presence of ATP actinpolymerizes to form helical filaments. Briefly describe the role ofATP and how necessary for microfilament assembly.
B.) All of the motors known to operate inconjunction with actin filaments are members of the myosinsuperfamily. Name the two major categories of myosin and their maindifferences.
C.) A cell is treated with a fluorescentlylabeled antibody against a specific form of myosin. In thefluorescence microscope, the antibody can be seen immediatelyunderlying the cell membrane and associated with somemembrane-bound organelles. What kind of myosin is it likely to be?Would this cell be able to carry out cytokinesis in the presence ofthese antibodies?
