Plants became erect, taller, and branched as a result
of their ability to produce
a. cutin.
b. lignin.
c. cellulose.
d. complex carbohydrates.
e. suberin.
Answer: b
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Vibrio cholerae is the bacterium responsible for cholera, a GI tract infection. Normally, it takes the ingestion of over one million bacterial cells to cause infection, but the consumption of antacids signficantly lowers this number. What does this tell you about the likely classification of V. cholerae in terms of pH preference?
It is likely an acidophile. It is likely an alkaliphile. It is likely an neutrophile.
Which of the following is NOT a factor in determining the potential of a new antimicrobial?
A. cost of production B. duplication of existing antimicrobial mechanism of action C. spectrum of action D. route of administration E. stability
The number of organisms necessary to insure infection is termed the
A. infectious dose. B. fatal number. C. minimum lethal dose. D. pathogenic number.
In which of the following cases will a Barr body be seen?
A) only XX B) XY C) XO D) only XXY E) both XX and XXY