Robert Koch's studies on Bacillus anthracis established a sequence of experimental steps to prove that microbes __________.
a. cause disease
b. recycle elements such as nitrogen
c. produce antiviral compounds
d. control insect pests
e. can be altered to produce products such as human insulin
Answer: a. cause disease
You might also like to view...
Research dealing with which human blood disorder was instrumental in linking the genotype to a specific phenotype, and what conclusion was reached?
What will be an ideal response?
Which of the following is a neurotransmitter that triggers a contraction of a voluntary muscle?
A) synapse B) action potential C) sodium D) acetylcholine
Which fungal phylum includes organisms that are of significant value to humans, such as the yeast Saccharomyces cerevisiae, antibiotic-producing species of Penicillium, truffles, and morels?
a. Ascomycota b. Basidiomycota c. Chytridiomycota d. Glomeromycota
Vibrio cholerae lives in water and gets toxin genes from a virus by phage conversion. The toxin kills the intestinal epithelial cells in the human host, resulting in massive diarrhea. Untreated cholera has about a 50% mortality rate. How do the bacteria benefit?
A. They don't -- humans are not the main host and their symptoms are maladaptive for the bacteria. B. The bacteria reproduce faster in a dead human. C. Diarrhea helps the bacteria to spread from person to person. D. Killing humans provides nutrients for the bacteria.