An unknown organism grows at the top of a tube in thioglycolate broth. This organism is best described as a(n) _______ for its oxygen requirements
Fill in the blank(s) with the appropriate word(s).
Answer: obligate aerobe
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Which would be the best way to directly test the hypothesis that
C. stellatus (a species of barnacle) is competitively excluded from the lower intertidal zone by B. balanoides (another species of barnacle)? A) Place individuals of each species in a jar and see which species survives. B) Remove all B. balanoides from the lower intertidal zone. C) Transplant B. balanoides to the upper intertidal zone. D) Clear rocks in an entire area and document recolonization events. E) Remove all C. stellatus from the upper tidal zone.
The presence of specific ________ signals that a given water source might be contaminated with pathogens
A) exotoxins B) chemical compounds C) endotoxins D) indicator microorganisms
What nucleic acid is subject to alternative splicing?
A. DNA B. rRNA C. pre-mRNA D. mRNA E. tRNA
Which tree of the North American eastern
forests has had its population decimated by a fungal disease?
a. chestnut b. maple c. oak d. eastern pine e. dogwood