Please match the virulence factor of Streptococcus pyogenes to its description.
Hyaluronidase
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
F) Enzyme that promotes invasion into tissues by breaking down the binding substance in connective tissues
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In eudicots the endosperm is usually stored in which of the following seed parts?
A. cotyledons B. embryos C. wall D. membrane E. None of these is correct
The domestic dog has 39 pairs of homologous chromosomes. A dog's somatic cells have ________ chromosomes and gametes have ________ chromosomes.
A) 78; 78 B) 78; 39 C) 39; 15 D) 156; 78 E) 39; 39
The epipelagic refers to the location of pelagic animals that can extend down to:
a. 10 m. b. 20 m. c. 100 m. d. 200 m. e. 1000 m.
A __________ is a virus that infects only bacteria. Fill in the blank(s) with the appropriate word(s)