Impetigo is caused by
A. Propionibacterium acnes
B. Corynebacterium diphtheriae
C. Staphylococcus aureus
D. Streptococcus pyogenes
E. both Staphylococcus aureus and Streptococcus pyogenes
Ans: E. both Staphylococcus aureus and Streptococcus pyogenes
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The coupled G protein most likely interacts with this receptor _____
A) at the NH3 end B) at the COO– end C) along the exterior margin D) at the loop between H5 and H6
Staphylococcus saprophyticus causes TOXIN-mediated infections of the urinary tract
a. true b. false
Laboratory experiments about bacterial mutation rates have demonstrated which of the following?
A) Bacterial mutation rates rarely evolve in short-term laboratory experiments; they are a relatively fixed feature of a species biology. B) In short-term laboratory experiments, bacterial mutation rates often evolve to be higher because higher mutation rates result in higher fitness. C) In short-term laboratory experiments, bacterial mutation rates often evolve to be lower because mutations are typically deleterious for organisms. D) Depending on the experiment, bacterial mutation rates sometimes evolve to higher rates, and other times evolve to lower rates.
An animal lives in an environment where there are few predators, but the population is very dense. They likely have a life-history that is
A. r-selected, meaning there is rapid exponential increase in population growth B. K-selected, meaning that the species will likely be well-adapted to crowded conditions C. r-selected, meaning that the ability of individuals to compete with others is favored D. K-selected, meaning high fecundity is favored