Substances that are contained in vaccines to help induce a better immune response are called
A. primary substances.
B. secondary substances.
C. adjuvants.
D. adjuncts.
C
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Clostridium difficile is a bacterium that is often found in the gastrointestinal tract of healthy individuals. It is also a common cause of hospital-acquired infections
Most individuals who become ill with C. difficile do so following antibiotic treatment. This information suggests that: A. C. difficile is not pathogenic (diseasecausing) in healthy people. B. C. difficile is resistant to antibiotics and antiseptics used in the hospital setting. C. C. difficile is adapted to the human gastrointestinal tract. D. C. difficile rebels when other organisms are eliminated from their environment.
What is true of the Shannon diversity index? Select all that apply.
_____ Within a community, Its value increases as the number of species sampled increases. _____ Its value is independent of species relative abundance. _____ It does not take into account very rare species. _____ Its value increases when individuals are more evenly distributed among species
Discuss the role of protists in both primary and secondary serial endosymbiosis. What will be an ideal response?
In which of the following regions has human conversion of natural ecosystems to other uses resulted in severe erosion of soil by wind or water?
A) prairies of North America B) forests of the Amazon Basin C) forests of Queensland, Australia D) all of the above