All of the following statements regarding stem cells are true, EXCEPT
A. Embryonic stem (ES) cells differentiate into pluripotent cells.
B. Pluripotent stem may be reverse-engineered from adult stem cells.
C. Totipotent stem cells differentiate into embryonic stem cells.
D. Totipotent stem cells may differentiate into placental cells.
E. Totipotent stem cells may only be harvested from the blastocyst stage.
Answer: E. Totipotent stem cells may only be harvested from the blastocyst stage.
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The number of offspring an individual organism could have under optimal conditions is called the
a. biotic potential. b. fertility rate. c. life expectancy. d. carrying capacity. e. fecundity.
An elk herd is observed over many generations. Most of the full-grown bull elk have antlers of nearly the same size, although a few have antlers that are significantly larger or smaller than this average size. The average antler size remains constant
over the generations. Which of the following effects probably accounts for this situation? A) directional selection B) stabilizing selection C) a bottleneck effect that resulted in low genetic diversity D) a high rate of gene flow
The microorganisms that do not have a nucleus in their cells are called
A. pathogens. B. eukaryotes. C. prokaryotes. D. fermenters. E. decomposers.
Which one of the following is not a variation of flowers frequently considered in investigations of flowers and their functions?
A. number of parts B. color C. shape D. fragrance E. preferred soil conditions