Please match the virulence factor of Streptococcus pyogenes to its description.
Streptolysin
A) Surface antigen that serves as the basis for alphabetical grouping; protects bacterium from lysozyme
B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host
C) Enzyme that plays a role in invasion by leading to the digestion of fibrin clots
D) Projecting surface antigen that facilitates adherence and resists phagocytosis
E) Chemical surface layer that prevents an immune response by the host
F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues
B) Toxin that causes beta-hemolysis on blood agar and injures cells of the host
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A recombinant DNA was constructed by inserting the DNA of interest into the AmpR gene of a pBR322 vector. The vector also contains a TetR gene that is not interrupted
After introducing the recombinant DNA into bacterial cells, the resulting transformants were tested on a variety of media. Which of the following results would be expected? A. growth on both ampicillin containing media and tetracycline containing media B. growth on ampicillin but not tetracycline containing media C. growth on tetracycline but not ampicillin containing media D. no growth on either ampicillin or tetracycline containing media E. growth only on media containing both antibiotics
What is the type of speciation that can occur in
an instant with a change in chromosome number? a. temporal b. mechanical c. behavioral d. ecological e. polyploidal
Air is continuously forced through tubes that thread
through vascularized tissue in a pair of inelastic lungs in a. some fish. b. amphibians. c. birds. d. reptiles. e. some small mammals.
Which method of birth control prevents follicle development?
A) diaphragm B) birth control pill C) female condom D) intrauterine device