Carriers of Staphylococcus aureus have no symptoms, and don’t know they are carriers unless they have a culture performed.
A) True
B) False
A) True
Feedback: This statement is true, no harm comes to persons who are colonized with Staphylococcus aureus.
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Rhizobium
A. fix nitrogen inside nodules on the roots of legumes. B. resemble fungi. C. produce antibiotics. D. produce a gall in plants.
Why do you think four sperm cells are produced as a result of gametogenesis but only one ovum is produced?
What will be an ideal response?
Why are conifers and cycads considered gymnosperms?
A. They have true vascular tissue but do not form seeds. B. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination. C. The fruit is not fleshy. D. The pollen is wind dispersed. E. Pollination and fertilization occur at different times.
Pyocyanin, a greenish-blue pigment produced by pseudomonads, acts as a virulence factor by
A) digesting lipids in tissues. B) forming a biofilm. C) breaking down reactive oxygen species. D) lysing red blood cells. E) generating reactive oxygen species.