The ultimate source of energy for humans comes from what source?
A. The sun
B. Plants
C. Water
D. Air
E. Animals
A. The sun
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Release of cross-bridges depends most directly on
A. calcium ions. B. potassium ions. C. adenosine diphosphate. D. adenosine triphosphate. E. creatine phosphate.
An animal with bilateral symmetry
a. has left and right sides. b. usually displays cephalization. c. produces mirror images regardless of the number of "cuts" through the central axis. d. has left and right sides and usually displays cephalization. e. has left and right sides, usually displays cephalization, and produces mirror images regardless of the number of "cuts" through the central axis.
Into what type of energy does the process of photosynthesis transform solar energy?
A) chemical B) mechanical C) heat D) kinetic
Salt is often used to melt ice on roads during the winter because it lowers the freezing/melting point of water. When salt dissolves in water, individual Na+ and Cl- ions break away from the salt lattice and become surrounded by water molecules. Why would this cause ice to melt?
A. Hydrogen bonds are formed, and the salt ions bond with O. As a result, it is more difficult for water molecules to bond and form ice. B. Hydrogen bonds are broken, and the salt ions interfere with interactions between H and O. As a result, it is more difficult for water molecules to bond and form ice. C. Hydrogen bonds are broken, and the salt ions bond with O and H respectively. As a result, it is more difficult for water molecules to bond and form ice.