Amanda was successfully treated for the P. aeruginosa infection, but on a subsequent visit to
the hospital, she was infected again. With this second infection, her immune system would
____________________.
a. respond more quickly to the antigen
b. immediately start to produce memory cells
c. have a reduced response due to recognizing the antigen
d. not be able to fight off the infection
A
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Which relationship is MOST likely to be observed between species of different classes?
A) A deltaproteobacterium oxidizes hydrogen sulfide into sulfate, which is then reduced by an epsilonproteobacterium. B) An epsilonbacterium oxidizes the hydrogen sulfide produced by a sulfur-reducing deltaproteobacterium. C) A sulfate-reducing epsilonbacterium produces sulfite, which a deltaproteobacterium reduces to hydrogen sulfide. D) Syntrophic metabolism of sulfur by a deltaproteobacterium and an epsilonproteobacterium occurs.
Which of the following characteristics of membranes does the term "selective permeability" refer to?
a. permits some molecules to cross the membrane while preventing others from crossing b. restricts the passage of polar molecules c. provides an anchor between adjacent cells d. allows membrane proteins to float freely within the membrane
Radiometric dating
a. is based on the premise that each isotope decays at a constant rate. b. is unpredictable because changes in temperature and pressure alter the results. c. can be used to date sedimentary rock. d. has a large error factor. e. is used for dating only recent fossils.
Excluding humans, which group of organisms is most likely to change the abiotic factors within an ecosystem?
A. producers B. detritivores C. herbivores D. None of these can change the abiotic factors within an ecosystem. E. All of these can change the abiotic factors within an ecosystem.