Floods and fires are examples of ________, which can dramatically and unpredictably reduce populations
A) demographic factors
B) density-dependent factors
C) logistic growth factors
D) environmental resistance
E) biotic factors
D
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Centromeres split and sister chromatids migrate to opposite poles in meiosis _____
A) anaphase I B) telophase I C) anaphase II D) telophase II
Animals obtain minerals such as phosphorus
a. primarily dissolved in drinking water. b. by inhalation. c. by eating herbivores. d. by metabolic conversion of other minerals. e. by none of these.
A molecular biologist treats a 600-bp length of linear DNA with HindIII restriction endonuclease. Following gel electrophoresis, the biologist observes that there is only one band on the gel and it corresponds with the migration distance of the 200-bp molecular weight marker. Assuming that no procedural errors were made, what can be concluded from these results?
A. Three HindIII recognition sequences were present in the original DNA. B. One HindIII recognition sequence was present in the original DNA. C. There were no HindIII recognition sequences present in the original DNA. D. Two HindIII recognition sequences were present in the original DNA.
In a single individual, how might herbicide resistance occur?
a. natural selection b. development of a mutation in a gene c. evolution of a specific gene d. sharing of alleles among individuals in a population