Approximately how many doublings can normal human fibroblasts undergo in culture?
a. 50 to 100
b. They will go on proliferating indefinitely.
c. They will not double at all but dispersing them in culture allows them to be studied in isolation from other cell types.
d. five
Ans: a. 50 to 100
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Eutrophication can lead to
a. an algal bloom. b. fish congregations. c. decreased water clarity. d. slow plant growth rates. e. a and c only.
The place where two plates meet and scrape past one another, creating stress that results in earthquakes, is a(n)
A. oceanic ridge. B. subduction zone. C. transform boundary. D. supercontinent.
Hemophilia is characterized by ____
a. defects in the mechanism of blood clotting b. an extremely low blood iron level c. jaundice of the eyes and skin d. muscular weakness and atrophy e. breathing difficulties
When an individual of African descent marries and has children with an individual of European descent, their children often have a mid-shade of skin color, but they could also have a light shade or a dark shade. This can best be described as
A. X-linked inheritance. B. the dominance of the gene for dark skin tone. C. pleiotropic inheritance. D. polygenic inheritance.