Which of the following hemolysins is a phospholipase?

A) lecithinase
B) Streptolysin-O
C) Staphylococcal -toxin
D) leukocidin


Answer: A

Biology & Microbiology

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The human b-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. Which type of selection is occurring with the b-globin gene?

A. stabilizing B. directional C. disruptive D. balanced E. negative frequency dependent

Biology & Microbiology

Which disease involves transmission by aerosolized water from whirlpool spas, air conditioners, cooling towers, and supermarket vegetable misters?

A. Pertussis B. Legionellosis C. Brucellosis D. Traveler's diarrhea E. Plague

Biology & Microbiology

Fishes' lateral line is comprised of multiple ____ that allow fish to detect vibrations and water currents

a. statoliths b. neuromasts c. statocysts d. stereocilia e. cupulas

Biology & Microbiology

The production of second messengers in signal transduction offers at least two advantages, speed and

A. reversibility. B. amplification. C. one-to-one stoichiometry. D. specificity. E. affinity.

Biology & Microbiology