Which statements are true? Explain why or why not.1 The role of ATP hydrolysis in actin polymerizationis similar to the role of GTP hydrolysis in tubulin polym-erization: both serve to weaken the bonds in the polymerand thereby promote depolymerization.2 Motor neurons trigger action potentials in musclecell membranes that open voltage-sensitive Ca2+ channelsin T tubules, allowing extracellular Ca2+ to enter the cyto-sol, bind to troponin C, and initiate rapid muscle contrac-tion.3 In most animal cells, minus-end directed microtu-bule motors deliver their cargo to the periphery of the cell,whereas plus-end directed microtubule motors delivertheir cargo to the interior of the cell.

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Cell Signaling

It allows cells to perform various cellular activities, coordinate, and interact with other cells. All cells of an organism receive signals from their environments and respond accordingly. Even the unicellular eukaryotes receive signals secreted by other cells and respond. In the case of yeast, mating takes place by signaling between the yeast cells. Communication by cell signaling in a multicellular organism has become a vast and important part of various fields of biology.