A diabetic patient has developed gas gangrene of the right foot. The most likely anaerobe causing this infection is:
a. Clostridium tetani.
b. Clostridium perfringens.
c. Clostridium botulinum.
d. Clostridium difficile.
B
Of the Clostridium species listed, C. perfringens is capable of causing gas gangrene in diabetic patients as a result of the loss of circulation in the extremities caused by diabetes.
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During DNA replication, each new strand begins with a short
A. amino acid primer. B. lipid primer. C. hydrophilic primer. D. DNA primer. E. RNA primer.
The embryonic germ layer of tissue in animals that develops into the muscles and reproductive system is the
A. ectoderm. B. protoderm. C. pachyderm. D. endoderm. E. mesoderm.
The Krebs cycle produces
A. carbon dioxide. B. phosphate. C. acetyl. D. CoA.
The type of polio that involves the infection of the brain stem and medulla is
A) asymptomatic polio. B) postpolio syndrome. C) bulbar poliomyelitis. D) minor polio. E) nonparalytic polio.