The bacteria Pseudomonas aeruginosa produces a protein that is secreted into its environment. The protein inhibits synthesis of elongation factor 2 (another protein) in humans. This effect may sound dangerous, but it has been considered as a possible
treatment for hepatitis B. The protein produced by P. aeruginosa is a(n)
A) endotoxin.
B) exotoxin.
C) biological weapon.
D) biofilm.
Answer: B
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In most human populations, lactase levels are highest soon after birth and drop off in middle-to-late childhood
a. True b. False Indicate whether the statement is true or false
Which of the following is not associated with mass extinctions?
a. After mass extinctions new species evolve to replace others. b. Mass extinctions do not affect species randomly. c. Species living in isolated areas are more susceptible to extinction. d. Mass extinctions take place over a very long geologic period of time. e. Although new species may evolve, it will take millions of years to replace the losses of a mass extinction.
Which group of mammals exhibits the widest
distribution and greatest diversity? a. marsupials b. monotremes c. placentals d. marsupials and monotremes e. placentals and monotremes
All chordates have a notochord, a postanal tail, segmental body wall muscles, a dorsal, hollow nerve cord, and a perforated pharynx
1.True 2.False