Systemic lupus erythematosus is characterized by:
A.) absence of immune complexes.
B.) increase in cells lining the synovial membrane.
C.) presence of dsDNA antibodies.
D.) HLA-DR antigens expressed on thyroid epithelial cells.
Ans: C.) presence of dsDNA antibodies.
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One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons B. >1,000 Daltons, but <1,500 Daltons C. >1,500 Daltons, but <5,000 Daltons D. >5,000 Daltons, but <10,000 Daltons E. >10,000 Daltons
What is an area of the Earth's surface currently undergoing primary succession?
A. Volcanoes in Hawaii. B. Behind retreating glaciers in Canada and Alaska. C. Volcanoes in Iceland. D. The area around Mount St. Helens in Oregon. E. All of the answers are correct.
Nitrogen is generally available to plants in only two forms: ammonium and ________
Fill in the blank(s) with correct word
In the section "Investigating Life: Birds Do, Bees Do It", M. lewisii and M. cardinalis are different species for which reason?
A. If they breed they do not form viable offspring. B. If they breed they do not form fertile offspring. C. They live on different continents. D. They do not breed in the wild. E. They do not look alike.