The third line of defense, or adaptive mechanisms, are different from innate mechanisms in
that ____________________.
a. white blood cells engulf antigens
b. physiological barriers play a larger role in the defense
c. antigens are involved
d. B- and T-cells target specific antigens
D
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Since quantitative traits can be described by a plot of the frequency vs value of the trait since
A. the trait can have a range of values B. the traits are discrete. C. the traits are discontinuous D. the traits are frequently the result of a single gene with more than two alleles.
Why do we so frequently use mutant alleles to determine structure and/or function of the wild type?
What will be an ideal response?
Many worker bees give their lives to save a bee hive from an attack by bears or other animals. In such cases, we now know that
A. each female worker is waiting to get her chance to reproduce. B. this is a case of bees consciously understanding the need to preserve the nest for their individual benefit-they might survive if all work together. C. These worker bees will have a reproductive benefit if the members of the hive survive. D. this is a case of sexual selection.
In early 2014, West African countries began diagnosing and reporting cases of Ebola for the first time in their history. This is an example of a(n) (endemic/epidemic/sporadic) disease
What will be an ideal response?