In order for the theory of common descent and the theory of natural selection to both be supported, what can we infer about the genetic material for all life?
A) It must change very rarely.
B) It must vary spontaneously and randomly.
C) It must be transferable between adults.
D) It must be transferable between different species.
B
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Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent B. they never differentiate into muscle cells in a normally developing animal C. they can differentiate into muscle cells in a normally developing animal D. they express a limited number of genes E. they have a small genome
A mark-recapture program marked 10 individuals in the first catch. The second catch has a total of 8 individuals, 4 of which were recaptures. What is the estimate of total population size?
A. 22 B. 24 C. 42 D. 20 E. 40
Loss of the cell wall is required for the endosymbiotic theory.
a. true b. false
The skin lesions characteristic of cutaneous infections with Bacillus anthracis are
A) eschars. B) acne. C) impetigo. D) scarlatina. E) pus-filled ulcers.