The true border between land and sea in the tropics is called the ____ zone
a. brown
b. white
c. gray
d. black
e. yellow
B
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Which of the following types of experimental evidence suggests that a particular organism thought to be part of the human microbiome is, in fact, just a laboratory contaminant?
A. Absence of ribosomal RNA evidence in a specific host location where the organism was not expected to have colonized B. Absence of ribosomal RNA evidence in a specific host location where the organism was believed to have colonized C. Presence of ribosomal RNA evidence in a specific host location where the organism was believed to have colonized D. Presence of ribosomal RNA evidence in a specific host location where the organism was not expected to have colonized
Why haven't humans evolved a resistance to the common cold?
A) Colds are effectively killed by antibiotics, so there's no need. B) Cold viruses haven't been in existence long enough to exert selective pressure. C) Colds are not serious enough to remove nonresistant variants from the population. D) We could evolve resistance if we stopped taking so many over-the-counter medications for colds.
After fermentation in human cells, lactate is converted to pyruvate in the
A) bone marrow. B) heart. C) muscles. D) lungs. E) bloodstream.
Imagine that you are about to give blood for the first time. While watching other donors around you, you become pale and have to sit down before you faint. Which vessels constricted to produce this nervous side effect?
A) Arterioles B) Veins C) Capillaries D) Arteries E) Venules