Which of the following is a feature shared by Staphylococcus aureus and Staphylococcus epidermidis?

A. slime layer (capsule)
B. protein A
C. coagulase
D. staphylokinase
E. hyaluronidase


Answer: A

Biology & Microbiology

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If a cell has the partial diploid genotype lacI+ lacO- lacZ+ lacY+ ______________________ lacI- lacO- lacZ+ lacY- , how will its gene expression function in the presence of allolactose?

Fill in the blank(s) with correct word

Biology & Microbiology

Nerve fibers that are larger in diameter and heavily myelinated (A? fibers) will depolarize before smaller, unmyelinated nerve fibers (C fibers). Which of the following would you expect to occur first when applying electrical stimulation to a muscle with a high frequency (100 Hz), but low pulse duration (100 µs)?

a. Intermittent muscle contraction (unfused tetanus) b. Consistent muscle contraction (fused tetanus) c. "Pins and needles" sensation d. Pain

Biology & Microbiology

In a population, allele S is strongly favored. However, over time, the frequency of the s allele does not significantly decrease, but rather is maintained. What evolutionary process(es) could be responsible for countering the effect of selection for the S allele? (Select all that apply.)A) mutationB) genetic driftC) gene flowD) assortative mating

What will be an ideal response?

Biology & Microbiology

Which of the following antimicrobial agents is the most toxic to humans?

A) 70% alcohol B) ethylene oxide C) quaternary ammonium compounds D) chloramines E) iodophors

Biology & Microbiology