Most plants absorb nitrogen in the form of ____
a. NH4+.
b. CN.
c. N2.
d. NH3.
e. NO3-.
ANSWER: e
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What is the closest parallel in animal structural levels of complexity to the branches, buds, flowers, seeds, and fruits of flowering plants?
A. Subcellular, specialized organelles. B. Bone cells, muscle cells, skin cells, nerve cells. C. Muscle tissue, connective tissue, nervous tissue, epithelial tissue. D. Heart, lungs, stomach, kidney, reproductive organs. E. Digestive system, reproductive system, skeletal system.
Species interactions between members of a community include __________, which benefits both
species. Fill in the blank(s) with the appropriate word(s).
Biochemical testing used for identification of pathogens involves each of the following, except
A). inoculation of additional media, incubation, and observation for a color change. B.) quick tests that take just a few seconds. C.) examining organisms through the microscope.
After several weeks of exercise, a human athlete's resting heart rate is typically lower than before because
A) the body needs less oxygen than before. B) the body temperature has increased. C) the stroke volume has increased. D) the cardiac output has decreased. E) the body produces less carbon dioxide than before.