The biome with the most complex diversity of life forms is the:
a. tundra
b. taiga
c. tropical rain forest
d. desert
e. grassland
c
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A protein region with a specific function and structure is called a
A) conserved site. B) domain. C) locale. D) motif.
Of the following, which is an explanation of why the partial pressure of oxygen is lower in the lung than in the external air?
a. Humidified air in the lungs causes oxygen to precipitate out. b. Lungs exert pressure on the air, reducing oxygen pressure. c. Oxygen in the lungs diffuses into the blood through alveoli. d. Oxygen cools within the lungs, exerting lower partial pressure.
In ponds and lakes, the zone beneath the depth of effective light penetration but above the bottom is referred to as the
A) littoral zone. B) limnetic zone. C) profundal zone. D) benthic zone.
Which of the following factors influences the efficiency of an antimicrobial agent?
A) Contact time B) Concentration of the antimicrobial agent C) Composition of the microbial population D) All of the above