The purple sulfur and green sulfur bacteria
A) both use hydrogen sulfide as a source of electrons.
B) generate oxygen.
C) preferentially use organic molecules as an electron source.
D) both lack gas vesicles.
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Q2: Streptococcus pyogenes
A) is alpha-hemolytic.
B) is gamma-hemolytic.
C) is
Q9: Cyanobacteria
A)are a form of algae.
B)are prokaryotes.
C)use hydrogen
Q10: The lactobacilli,in their role as normal flora
Q11: Anoxygenic phototrophs
A) produce oxygen.
B) use water as
Q12: Comparatively greater energy is released when
A)carbon dioxide
Q13: Methanogens often grow in association with
A)nitrifying bacteria.
B)lithotrophic
Q15: Phycobiliproteins are
A)found in purple sulfur bacteria.
B)found in
Q17: Which of the following colonize the vagina
Q18: The earliest oxygenic phototrophs are thought to
Q19: Propionibacterium
A)produces propionic acid.
B)produces lactic acid.
C)is responsible for
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