The earliest oxygenic phototrophs are thought to be
A) purple sulfur bacteria.
B) green nonsulfur bacteria.
C) purple nonsulfur bacteria.
D) cyanobacteria.
E) green nonsulfur bacteria AND purple nonsulfur bacteria.
Correct Answer:
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Q2: Streptococcus pyogenes
A) is alpha-hemolytic.
B) is gamma-hemolytic.
C) is
Q13: Methanogens often grow in association with
A)nitrifying bacteria.
B)lithotrophic
Q14: The purple sulfur and green sulfur bacteria
A)both
Q15: Phycobiliproteins are
A)found in purple sulfur bacteria.
B)found in
Q17: Which of the following colonize the vagina
Q19: Propionibacterium
A)produces propionic acid.
B)produces lactic acid.
C)is responsible for
Q20: Endospores
A)are a form of reproduction.
B)are a dormant
Q21: Azotobacter
A)forms endospores.
B)forms cysts.
C)fixes carbon dioxide.
D)are used as
Q22: Which of the following structures would be
Q23: Rhizobium
A)fix nitrogen inside nodules on the roots
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