A difference between a stem cell and a progenitor cell is that
A) a progenitor cell cannot self-renew and a stem cell can.
B) a stem cell cannot self-renew and a progenitor cell can.
C) progenitor cells are rare but stem cells are abundant.
D) progenitor cells are not present in embryos but stem cells are.
A) a progenitor cell cannot self-renew and a stem cell can.
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Factor(s) not found in abscesses is/are
A. pus. B. dead leukocytes. C. tissue remnants. D. blood vessels.
What phenomenon would violate the conditions for Hardy-Weinberg equilibrium?
A. The population is isolated from other populations. B. Females select males based on secondary sex traits. C. The population is large. D. No genotypes within the population have a reproductive advantage. E. Genetic drift within the population does not change allele frequencies.
The color of Siamese cats is controlled by
a. multiple alleles. b. quantitative inheritance. c. incompletely dominant genes. d. nondisjunction. e. variation in temperature, with cold temperature producing dark fur.
Dominant species tend to be more abundant than other species because they
A) prey upon or parasitize other species. B) outcompete other species. C) are preyed upon less than other species. D) reproduce more rapidly than other species.