Populations ____
a. are only limited by one factor at a time
b. increase arithmetically
c. may increase indefinitely
d. are limited by the carrying capacity
e. overcome limiting factors by increasing their biotic potential
ANSWER: d
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What type of procedure is appropriate to isolate revertants from a population of threonine auxotrophic cells?
A. Grow the auxotrophic cells on and agar plate with threonine; any colonies that form are presumed revertant. B. Grow the auxotrophic cells on an agar plate without threonine; any colonies that form are presumed revertant. C. Threonine auxotrophic revertants could not be isolated on any type of media. D. Grow the auxotrophic cells in broth with threonine; if the broth becomes cloudy, revertants are presumed present.
The genotypic definition of race states that races are populations of the same species in which allele frequencies differ by ____
a. 15%-20% b. 85% c. 1 in 1000 nucleotides d. 25%-30% e. 5%-10%
Diseases of short duration frequently followed by long-term immunity are referred to as
A. intermittent infections. B. chronic infections. C. acute infections. D. persistent infections.
The Kingdom Protista is populated by multi-celled eukaryotic organisms that lack tissue specialization.
A) True B) False