A 67-year-old diabetic man develops intense pain and swelling on his calf, which acquires a bronze discoloration and develops significant tissue necrosis with hemorrhagic bullae and gas production (gas gangarene). Which of the following is the important contributing agent?
A. Clostridium perfringens
B. Clostridium difficile
C. Clostridium botulinum
D. Clostridium tetani
Ans: A. Clostridium perfringens
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During which stage of interphase is DNA replicated?
A) G2 B) G1 C) S
The synthesis of ATP as a result of the light-dependent reactions of photosynthesis is an __________
reaction that is coupled to the diffusion of __________ down their concentration gradient. a. endergonic; protons b. energy-releasing; hydrogen ions c. exergonic; electrons d. energy-acquiring; electrons e. oxidation; water
The producers in hydrothermal vent communities are
A) coral. B) zooplankton. C) kelp. D) phytoplankton. E) sulfur bacteria.
The function of the "ciliary escalator" is to
A) propel inhaled dust and microorganisms toward the mouth, away from the lower respiratory tract. B) remove microorganisms from the gastrointestinal tract. C) remove microorganisms from the lower respiratory tract. D) trap microorganisms in mucus in the upper respiratory tract. E) trap inhaled dust and microorganisms in mucus and propel it away from the lower respiratory tract.