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 antibody) of IgG, exerting an anti-opsonin (and therefore strongly antiphagocytic) effect
A. capsule
B. protein A
C. cytolytic exotoxins
D. superantigen exotoxins
E. DNAse enzymes
Answer: B. protein A
You might also like to view...
A researcher is comparing atmospheric CO2 levels in Earth's northern and southern hemispheres during June-August. As more terrestrial plants are present in the northern hemisphere, what do you expect she will find?
A. Atmospheric CO2 measurements will be greater in the northern hemisphere. B. Atmospheric CO2 measurements will be greater in the southern hemisphere. C. As atmospheric CO2 measurements represent global amounts, measurements in the northern and southern hemispheres will be (approximately) the same.
In vertebrates, the CNS consists of the
a. brain and spinal cord. b. brain and gray matter. c. spinal cord and gray matter. d. brain and reflexes. e. spinal cord and nerves.
Which of the following are decomposers?
A) mushrooms B) mites C) millipedes D) all of the above
The roots of monocots are generally ________, whereas the roots of dicots are generally ________
A) thick taproots; thin and fibrous B) spread out laterally; deep C) deep; spread out laterally D) covered in root hairs; lacking root hairs