Streptococcus pyogenes is one of the most pathogenic microorganisms to human. Which of the following virulence factors produced by this organism can destroy both RBC and WBC?
A. Streptolysin
B. Streptokinase
C. Hemolysin
D. Leukocidin
E. More than one of the above answers are correct
Ans: A. Streptolysin
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The function of eukaryotes membranes include
_____ barriers separating extracellular and intracellular environments. _____ cell-to-cell adhesion. _____ ATP synthesis. _____ cell signaling. _____ unselective transportation.
A fire has swept through a mature forest and devastated the area. Virtually all vegetation is burned and considered a complete loss. Foresters, however, realize that plants will soon colonize the area starting the successional process that will eventually restore the forest. Will the pioneer plants that first colonize the area most likely be r-selection strategists or K-selection strategists?
Explain your answer. What will be an ideal response?
When fisheries managers move fish from one lake to another, this causes gene ________.
A. dominance B. blending C. mutation D. flow
Salmonella typhi
A. multiplies within phagocytes. B. is not a coliform. C. can be treated with antimicrobics. D. causes invasive infection of the small intestine. E. All of the choices are correct.