What is the recommended range of weight gain, in lbs, during pregnancy for an underweight woman?
a. 15-25
b. 28-40
c. 42-50
d. 55-62
e. 65-80
ANS: B
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Cells regulate the osmotic pressure between their internal and external environments by
A. transmitting signals to the hypothalamic thirst mechanism prompting us to drink. B. "drinking" in fluid via pinocytosis or expelling fluid via exocytosis. C. using transport proteins to pump electrolytes across the cell membrane. D. allowing passive diffusion of sodium and potassium across the cell membrane.
Why are some raisins brown-colored and some raisins golden-colored?
A. Dark-colored raisins are darker because of heat treatment, which changes the pH of the fruit, thus darkening it. B. Dark-colored raisins are treated with metal salts. C. Light-colored raisins are often treated with sulfur dioxide, which prevents enzymatic browning. D. Light-colored raisins are treated with ethylene gas to facilitate ripening.
Which of the following accurately describes minerals?
a. When a food is burned, all the minerals are found in the ash. b. The body absorbs each mineral from foods in much the same way. c. Minerals in food can be destroyed by acid. d. The body needs about 200 milligrams of each trace mineral each day. e. Major minerals are more important than trace minerals.
Which type of absorption requires the use of a carrier protein but not energy?
A. passive diffusion B. facilitated diffusion C. active transport D. endocytosis