Biogeochemical cycles involve
A. the movement of chemicals through ecosystems.
B. just those nutrients that are limiting for organisms.
C. the nutrients used solely by primary producers
D. all chemical elements plus light energy.
E. None of these choices are correct.
A. the movement of chemicals through ecosystems.
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Most mammals excrete _____; most aquatic animals excrete _____; birds, insects, and many reptiles excrete _____
A. uric acid; urea; ammonia B. uric acid; ammonia; urea C. urea; uric acid; ammonia D. urea; ammonia; uric acid E. ammonia; urea; uric acid
Which of the following bacteria is both photosynthetic and Gram-positive?
A. Purple bacteria B. Cyanobacteria C. Heliobacteria D. Green bacteria E. None of the choices are correct.
Zn + 2H+ = Zn2+ + H2 is an example of a redox reaction. What is happening to the hydrogen ions during this reaction, in which a bond is formed between the two H atoms?
A. Oxidation reaction and acceptance of an electron. B. Reduction reaction and acceptance of an electron. C. Reduction reaction and donation of an electron. D. Oxidation reaction and donation of an electron.
The gland that secretes fructose and prostagladins that become part of the semen is the
A. seminal vesicle. D. epididymus. B. bulbourethral gland. E. vas deferens. C. prostate gland.