Microbial degradation of hydrocarbons cannot take place using ________ as the electron acceptor.
A. nitrate
B. carbon dioxide
C. sulfate
D. oxygen
Answer: B
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Match the following items with the correct phrases.
_______1. When two microorganisms occupying the same environmental niche have absolutely no effect upon each other, it is known as ____________________. _______2. Bacterial vaginosis is an example of ____________________. _______3. ____________________ is a symbiotic relationship of benefit to one of the symbionts, but neither beneficial nor harmful to the other. _______4. ____________________ is a symbiotic relationship of benefit to one of the symbionts, and detrimental to the other. _______5. A lichen is a classic example of ____________________. a. commensalism b. mutualism c. neutralism d. parasitism e. synergism
A DNA barcode is being developed for use in conservation biology based on ______
a. mitochondrial genes in plants b. chloroplast genes in plants c. nuclear genes in animals d. mitochondrial genes in animals e. bacterial genes
Name the labeled structures of the black bread mold pictured here and describe the function of these structures. 
a. ________b. ________c. ________d. ________e. ________
What will be an ideal response?
Refer to the accompanying figure. The component labeled as B is:
a. DNase.
b. DNA polymerase.
c. RNA primase.
d. RNA polymerase.
e. reverse transcriptase.