Which technique is often used to determine the identity and abundance of microorganisms in an environment? (This technique is particularly useful because it does not require culture.)
a. nucleic acid hybridization
b. ribotyping
c. fluorescent in situ hybridization (FISH)
d. DNA chips
Answer: c. fluorescent in situ hybridization (FISH)
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Many species of ants "farm" aphids, protecting these insects and collecting concentrated sugars known as honeydew from them. The relationship between such an ant and its aphids is known as
A. mutualism. B. defensive mutualism. C. parasitism. D. predation. E. amensalism.
The concentration of ____ has the greatest influence on the regulation of breathing rate
a. O2 b. CO2 c. H+ d. N2 e. CO
One of the main functions of the hypothalamus is to produce ____ hormones, which affect the ____
pituitary.
a. releasing; posterior b. releasing; anterior c. activating; posterior d. amplification; anterior e. suppressing; anterior
How is tuberculosis transmitted?
A) by sexual contact B) by contaminated food C) by sneezes D) by infected blood products