Why doesn't your immune system attack your own cells?
What will be an ideal response?
Immature lymphocytes that respond to "self" antigens (self MHCs) are destroyed before they reach maturity. Any self-reactive lymphocytes that escape apoptosis are prevented from attacking self body cells by regulatory T cells.
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Mendel chose to study pea plants because they have a long life cycle that offers ample time for analysis
a. True b. False Indicate whether the statement is true or false
The study of dentition tells the researcher what about an animal?
a. its diet only b. its lifestyle only c. its intelligence only d. its diet and lifestyle e. its diet, lifestyle, and intelligence
Cavener and Clegg (1981 ) demonstrated natural selection by observing the cumulative change in allele frequencies in populations of Drosophila melanogaster that were subjected to high levels of ________
A) mercury B) carbon dioxide C) alcohol D) sugar E) nitrous oxide
Refer to the paragraph on scarlet gilia. Some plants changed their flowers to lighter colors, and some retained the same darker color all season. Which plants do you expect produced more fruit?
A) those that changed their color to a lighter shade B) those that stayed darker C) the same numbers of fruit on both