Active transport of amino acids in plants at the cellular level requires _____
A) NADP and channel proteins
B) xylem membranes and channel proteins
C) sodium/potassium pumps and xylem membranes
D) ATP, transport proteins, and a proton gradient
Answer: D
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Imagine that a population of meerkats exhibits an exponential growth curve. What does this tell you about the intrinsic growth rate (r) of the meerkat population?
A. The intrinsic growth rate is steadily increasing. B. The intrinsic growth rate is steadily decreasing. C. The intrinsic growth rate has remained constant. D. The intrinsic growth rate is fluctuating. E. The intrinsic growth rate increased at first, but then decreased.
What is currently a main contaminate of beaches?
a. Legally dumped wastes b. Release of raw sewage c. Overflowing storm drains d. None of these choices
Which structure has both endocrine and exocrine functions?
a. gallbladder b. stomach c. small intestines d. liver e. pancreas
Alexander Fleming kept finding mold contamination that was killing his bacterial cultures. This observation eventually lead to the development of the antibiotic penicillin. Why would the fungi produce a compound that is selectively toxic to bacteria?
A. The bacteria produce toxins that can kill the fungi. B. The fungi and the bacteria have a symbiotic relationship. C. The fungi are parasites of the bacteria. D. The fungi compete with the bacteria for resources.