Hereditary nonpolyposis colon cancers (HNPCC) ____
a. are rare in the United States, but common in Europe
b. begin with a mutation in the APC gene
c. are caused by one-of-a-kind DNA sequences called microsatellites
d. are caused by one mutation in a single gene
e. are caused by several mutations in several different genes
e
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Birds generate a lot of heat, especially during flight. Yet the adipose tissue under their skin and the feathers atop their skin make it difficult to eliminate excess heat across the skin
Which of the following alternatives can absorb body heat and eliminate it from the bird most effectively? A) air in the air sacs B) lymph in the lymphatic vessels C) blood in the vessels D) blood in the heart E) urine in the bladder
Two kinds of mice live in the same area but one is black and the other is brown. Which of the following questions would be most valuable in determining if they are of the same species?
A. Do members of the two kinds mate with one another and have offspring that reproduce? B. Do the two kinds have other physical differences other than color? C. Are the brown mice eaten more often by owls than black mice? D. Do the brown mice climb trees more often than black mice?
Clonal selection
A) determines the pool of mature leukocytes that will be stimulated by macrophages. B) requires the activation of natural killer cells. C) describes the proliferation of B and T lymphocytes after they have been activated by an antigen. D) requires the presence and activation of complement.
When you give J.O. the tetanus injections, you find J.O. in the position shown in the illustration. Are any of these findings of concern to you? If so, how would you fix it?
What will be an ideal response?