Which of the following is NOT a risk factor for hypertension?
a. smoking
b. obesity
c. chronic stress
d. excessive salt intake
e. diet high in sources of potassium and calcium
ANSWER: e
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Organic molecules store _________ energy in their ______________ bonds
A. potential; ionic B. potential; covalent C. kinetic; ionic D. kinetic; covalent E. kinetic; hydrogen
The Burgess Shale preserves a remarkable fossil record of:
A. delicate flowers and mushrooms from the early invasion of land plants. B. marine life during initial diversification of animals in the Cambrian Period 505 million years ago. C. plants, insects, and mammals around 50 million years ago, as the age of mammals began. D. the tracks of dinosaurs walking on land. E. molecular evidence of bacteria and other organisms.
When salt dissolves in water as illustrated in the figure above, the water molecules form ____ around
the Na+ and Cl? ions.
a. covalent bonds b. hydration layers c. nonpolar interactions d. membranes e. ionic bonds
The contracting of a muscle to move a body part or digesting food is an example of potential energy.
a. true b. false