Which of the following describes a major component of the Staphylococcus aureus cell wall. It binds to the 'Fe' moiety (stem of the Y-shaped antibody) o rIgG, exerting an antiopsonin (and therefore strongly antiphagocytic) effect?
A. capsule
B. protein A
C. cytolytic exotoxins
D. superantigen exotoxins
E. DNAse enzymes
Ans: B. protein A
Biology & Microbiology
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This class of mollusk includes snails
a. Bivalvia b. Annelida c. Gastropoda d. Pseudopoda e. Cephalopoda
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Sharks belong to this kingdom
A) cartilagenous B) animalia C) chondrichthyes D) sharkilia
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Non-native species that are introduced to new environments, spread far beyond the original point of introduction, and cause damage are called
A) predators. B) pathogens. C) invasive species. D) herbivores.
Biology & Microbiology
How does gene expression differ in muscle and nerve cells?
What will be an ideal response?
Biology & Microbiology