You would like to test the hypothesis that ammonia-oxidizing Archaea are more active and abundant than ammonia-oxidizing Bacteria in coastal marine water. What technique(s) or experiment(s) could you use to test this hypothesis?

A) environmental proteomics
B) fluorescent in situ hybridization (FISH)
C) stable isotope probing using 15N labeled ammonia
D) stable isotope ratios of ammonia and nitrite


Answer: C

Biology & Microbiology

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Bacteria that can absorb light energy and convert it into ATP are commonly called

A. cytochromes. B. lysosomes. C. chemotrophs. D. phototrophs. E. cytochromes AND chemotrophs.

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Which structure conducts electrical signals from the apex of the heart to the ventricular myocardium, causing the ventricles to contract?

a. arterioles b. sinoatrial node c. Purkinje fibers d. atrioventricular node

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Which term refers to a flower that lacks either stamens or carpels?

a. perfect b. imperfect c. incomplete d. complete

Biology & Microbiology