Pus formation in skin lesions caused by Staphylococcus aureus infections is in part due to production of

A) coagulase.
B) hemolysins.
C) leukocidin.
D) catalase.


Answer: C

Biology & Microbiology

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Which of the following were the first vertebrates to live and reproduce in dry environments?

A. fish B. amphibians C. birds D. reptiles E. mammals

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Nematodes and rotifers have a body cavity that is

a. called a coelom. b. called a pseudocoelom. c. completely lined by tissues derived from mesoderm. d. both a and c.

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________ environmental change is a direct result of the organisms within the community

Fill in the blank(s) with correct word

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DNA replication occurs

a. during both mitosis and meiosis. b. only during mitosis. c. only during meiosis. d. during the S phase. e. during G2.

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