The typical osmolarity of most body fluids in humans and other mammals is about ____ mOsm/L
a. 5
b. 225
c. 300
d. 1000
e. 1500
ANSWER: c
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_____ selected species have a low rate of per capita growth.
A. r- B. S- C. K- D. ?- E. J-
A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid influences the movement of potassium ions out of the guard cells. C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. E. Abscisic acid causes the guard cells to become more turgid.
Most digestion in humans occurs in the first 25 centimeters of the 6-meter length of the small intestine called the _________________.
A. cecum B. duodenum C. jejunum D. colon E. omasum
Which of the following statements concerning bacterial growth at low temperatures is not true?
A) Low temperatures slow growth of cells B) Low temperatures reduce the rate of chemical reactions C) Low temperatures decrease the rate at which nutrients cross the cell membrane D) Low temperatures destroy lipids that make up the cell membrane E) Low temperatures reduce the fluidity of the cell membrane