Which of the following accurately represents how intermediate filaments differ from actin filaments and microtubules? a. only intermediate filaments associate with motor proteins. b. only intermediate filaments are composed of the same protein subunits in all cells. c. only intermediate filaments play a purely structural role. d. only intermediate filaments are polar with plus and minus ends.

Match the following terms describing electrical events with the correct phases of the cardiac cycle. the ventricular muscle cells depolarize at the start of this phase. during this phase, na+ entry through the funny channels causes the pacemaker potential of sa nodal cells to gradually become less negative until it reaches threshold. the ventricular muscle cells repolarize right before this phase. the cytosolic concentration of calcium in the contractile cells of the ventricle is highest during this phase. a. isovolumetric relaxation b. ventricular ejection c. isovolumetric contraction d. ventricular filling

Agenus is a taxonomic grouping that identifies a collection of species. when a scientist discovers a new species, how is this species assigned to a genus

What is the name of the type of cell division that occurs in the prokaryotic cell cycle