Although all of the following microbes are of serious concern, which one is ranked as urgent on the CDC's list of top drug-resistant pathogens?
A) Candida
B) Clostridium
C) Mycobacterium
D) Campylobacter
E) Pseudomonas
Answer: B
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Protein synthesis on the primordial Earth may have been catalyzed by ____ before the evolution of enzymes
a. lightning b. RNA c. carbohydrates d. amino acids e. DNA
What is the specific role of cyanobacteria (or green algae) in lichens?
A. to help attach the lichens to surfaces B. to synthesize defensive compounds C. to provide fungi with nutrients in usable forms D. to transport water throughout lichens E. Cyanobacteria and green algae play no role in lichens, as lichens consist of fungi.
The use of salt and sugar in preserving various types of foods is an application of which of the following concepts?
A. nitrogen fixation B. osmotic pressure C. pH D. hydrostatic pressure E. quorum sensing
The dominant plant species closest to the water line of salt marsh communities is:
a. cordgrass. b. pickleweed. c. spike grass. d. salt wort. e. mangroves.