The defining characteristic of a stem cell is
A) self-repair.
B) self-renewal.
C) the ability to turn into a cancer cell.
D) its origin from a progenitor cell.
B) self-renewal.
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It takes very few molecules of a hormone to cause changes in a target cell. This may be explained by the fact that: (Select all correct answer options.)
A. transcriptional activation produces many copies of mRNA, each of which is translated many times. B. the mechanism of hormonal action involves the replication of the hormone within the target cell to quickly magnify the hormone's effect. C. hormones are large molecules that persist for years and can repeatedly stimulate the same cell. D. the mechanism of hormonal action may involve an enzyme cascade that amplifies the response to a hormone. E. the mechanism of hormonal action involves memory cells that have had prior contact with the hormone and immediately respond to its presence.
In which of the following would it be possible to find the most dilute urine?
1.proximal tubule 2.loop of Henle 3.distal tubule 4.collecting duct
Life probably would never have emerged on
Earth if the ancient atmosphere had been the same as the present one in regard to a. carbon dioxide. b. hydrogen. c. oxygen. d. nitrogen. e. carbon monoxide
In the images below, which contains a disconformity?