Which of the following describes a major component of the Staphylococcus aureus cell wall. It binds to the 'Fc' moiety (stem of the Y-shaped anitoby) of IgG, exerting an antiopsonin (and therefore strongly antiphagocytic) effect
A. capsule
B. protein A
C. cytolytic exotoxins
D. superantigen exotoxins
E. DNAse enzymes
Answer: B. protein A
Biology & Microbiology
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Indicate whether the statement is true or false.
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In horsetails, lycophytes, and whisk ferns, ____
a. spores give rise to gametophytes b. the main plant body is a gametophyte c. the sporophyte bears sperm- and egg-producing organs d. the gametophyte is the dominant stage in the life cycle e. the gametophyte produces spores
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Which chordate trait evolved first?
A) Calcium-hardened skeleton B) Amniotic egg C) Four limbs D) Skull and backbone
Biology & Microbiology
How are length, area, and volume related in terms of the three dimensions of space?
What will be an ideal response?
Biology & Microbiology