Explain why an individual lymphocyte clone that interacts with a specific LPS constituent of Salmonella will not react with the LPS of other bacteria
What will be an ideal response?
Answer: The adaptive response is inducible only when triggered by a unique antigen on a pathogen. The terminal sugars that constitute an antigen on the polysaccharides of Salmonella spp. are unique for the genus and are not shared by other bacteria.
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Match the infectious agent on the left with the appropriate cancer type on the right.
A) Burkitt's lymphoma B) cervical cancer C) bladder cancer D) liver cancer E) stomach cancer 1) Epstein-Barr virus 2) hepatitis B virus 3) human papilloma virus 4) Helicobacter pylori 5) parasitic flatworms
The distinctive mating signals that have evolved as part of an animal's courtship illustrate what type of reproductive
isolating mechanism? a. gametic isolation
b. temporal isolation c. behavioral isolation d. mechanical isolation e. communicative isolation
Reinforcement would eventually
A. reduce the formation of hybrids. B. increase the fitness of hybrids. C. favor and therefore increase the formation of hybrids. D. have no effect on hybrid formation.
A seal that just ate a clam is eaten by a shark. The shark is acting as a _____.
a. producer b. secondary consumer c. tertiary consumer d. detritivore e. primary consumer