Members of which of the following genera are the most common sexually transmitted bacteria in the United States?
A) Bacteroides
B) Rickettsia
C) Chlamydia
D) Helicobacter
E) Treponema
C
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In the history of human population growth, the earliest stage is referred to as the
a. agricultural phase. b. technological phase. c. hunting and gathering phase. d. industrial phase. e. prehistoric phase.
Why are lichens a good indicator of environmental quality?
A. Toxins inhibit their reproduction. B. If the air is polluted, they cannot get enough sunlight for photosynthesis. C. If the soil is polluted, they cannot produce roots. D. They cannot absorb toxins. E. They cannot excrete absorbed toxins.
Which of the following statements concerning living phytoplanktonic organisms are true?
1. They are important members of communities surrounding deep-sea hydrothermal vents. 2. They are important primary producers in most aquatic food webs. 3. They are important in maintaining oxygen in Earth's seas and atmosphere. 4. They are most often found growing in the sediments of seas and oceans. 5. They can be so concentrated that they affect the color of seawater. A) 1 and 4 B) 1, 2, and 4 C) 2, 3, and 4 D) 2, 3, and 5 E) 3, 4, and 5
If a DNA samples contains 13% adenine, what percentage of the sample contains cytosine?
A. 13% B. 37% C. 26% D. 74%