Even though all people are exposed to potential carcinogens on a daily basis, we do not all develop cancer. Why?
a. The carcinogens only affect tumor suppressor genes.
b. Human cells are resistant to carcinogens until we are approximately 50 years old.
c. DNA repair mechanisms through pathways activated by tumor suppressor genes are able to correct some of the mutations that occur.
d. Humans' oncogenes protect us from most of the carcinogens we are exposed to.
Answer: c. DNA repair mechanisms through pathways activated by tumor suppressor genes are able to correct some of the mutations that occur.
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a. perfect b. imperfect c. complete d. incomplete e. irregular
In an inflammatory response, the direct effect of histamine is to ____
a. dilate blood vessels causing increased blood flow to the area of infection b. decrease heat accumulation in the area of infection c. directly kill bacteria d. attack cytotoxic T cells e. cause B cells to release antibodies
Which animals use air sacs to ventilate their lungs?
a. reptiles b. horses c. birds d. frogs
In comparing the chromosomes of humans, chimpanzees, gorillas, and orangutans, what type of genomic evolution has occurred in chromosome 2 in the human, as compared with the other three species?
A. fusion. B. duplication. C. inversion. D. inversion followed by duplication. E. fragmentation.