Who formalized a set of criteria for determining the cause of infectious diseases. He proposed that for concluding that a microbe causes a particular disease, these criteria must be fulfilled.
A. Alexander Fleming
B. Louis Pasteur
C. Ignatz Semmelweis
D. Robert Koch
E. Joseph Lister
Ans: D. Robert Koch
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Because of the high requirement for reducing power in nitrogen fixation, the nitrogenase enzyme that carries out the reaction is very sensitive to the presence of ________.
A. oxygen B. carbon dioxide C. light D. None of the choices are correct.
Angiosperms
a. are the most successful of all plants. b. are the most diverse of all plants. c. produce seeds inside an enclosed structure. d. have embryos that are provided with endosperm. e. have all of these characteristics
Which of the following STDs can infect the nervous system?
A) gonorrhea B) chlamydia C) syphilis D) HPV infection
The terms "run" and "tumble" are generally associated with
A) cell wall fluidity. B) taxic movements of the cell in response to attractants or repellents. C) clustering properties of certain rod-shaped bacteria. D) cell membrane synthesis.