Which of the following is the BEST description of evolution as currently understood by modern biologists?
a) Evolution is goal directed.
b) Evolution is influenced by the differential survival and reproduction of phenotypes.
c) Evolution includes the results of selection for acquired characteristics.
d) Evolution is synonymous with the process of mutation.
e) Evolution is synonymous with the process of gene flow.
Ans: b) Evolution is influenced by the differential survival and reproduction of phenotypes.
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Which one of the following statements about Chlamydia and Chlamydophila spp. is false?
A) They are obligate intracellular pathogens. B) They are considered to be “energy parasites.” C) The diseases they cause are all arthropodborne. D) They are considered to be Gram-negative bacteria.
All of the following are currently used to clean up oil spills except:
a. booms. b. naturally occurring bacteria. c. genetically engineered bacteria. d. straw. e. skimmers.
Based on the graph, how soon could another action potential be easily initiated (at the end of the relative refractory period) after the first stimulus?
A) less than 0.5 msec B) 1 msec C) 2 msec D) 3 msec E) 4 msec
What is the physical basis for the independent assortment observation that Mendel made?
A) Homologous chromosomes are randomly aligned and separated during meiosis. B) Recombination (crossing over) occurs in meiosis. C) Sister chromatids do not separate until meiosis II. D) Male and female gametes are produced in separate organs in separate individuals. E) There are two chromosome divisions in meiosis.