In any environment, both biotic and abiotic factors influence the population size of each type of organism. Which of the following is a biotic limiting factor for populations living in a desert ecosystem?
A) daytime temperatures
B) water availability
C) nitrogen content in soil
D) available edible plant biomass
Ans: D) available edible plant biomass
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Darwin hypothesized that advantageous hereditary traits in nature would become more common in populations due to
the process of ____.
a. inheriting acquired traits b. use and disuse c. selective breeding d. artificial selection e. natural selection
Traditional taxonomy differs in what way or
ways from cladistics?
a. cladistics includes extinct species in its analysis b. cladistics is more accurate than traditional taxonomy c. traditional taxonomy may include genetic analyses whereas cladistics does not d. traditional taxonomy uses derived characters whereas cladistics does not e. more than one of these is a difference
Which of the following represents acclimation?
A) Deeper beaks evolve in a population. B) Marine lionfish are able to tolerate freshwater in estuaries. C) Tropical trees grow taller than temperate ones to compete for light. D) Poisonous animals are brightly colored to ward off predators.
A defining characteristic of eukaryotic organisms is that they
A. have their transcription occurring in the cytoplasm and translation in the nucleus. B. carry out protein synthesis only in the presence of the cAMP molecule. C. use the leucine zipper primarily for the production of the amino acid tryptophan. D. have only operons to assist in gene expression. E. have their transcription occurring in the nucleus and translation in the cytoplasm.