Which activity can occur without the use of
energy?
(1) contraction of muscle tissue
(2) protein synthesis in a cell
(3) active transport of minerals
(4) movement of water across a membrane

Curare, a poison extracted from south america shrub, blocks the binding of each by muscle cells. what do you suppose would happen to your muscles, including the ones involved in breathing, if a toxic dose of curare entered your bloodstream?