Histone codes are important because: (Select all correct choices)
A. they are associated with chromatin
remodeling and are therefore thought to
affect gene transcription.
B. they are associated with CpG island
methylation and are therefore thought to
affect gene transcription.
C. they are associated with cancer genes and
their regulation by gene transcription.
D. they are associated with the environmental
and developmental cues that determine
whether viral genes and genes in
transposable elements are turned off and on.
A
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A basal body anchors what part of a cell?
a. ribosome b. thylakoid
c. centriole d. flagellum e. lysosome
Frederick Griffith did experiments on genetic transformation. Which of the following statements about his experiments is accurate?
a. Griffith used only pathogenic bacteria in his experiments. b. The combination of living nonencapsulated bacteria and heat-killed encapsulated bacteria did not cause disease. c. Griffith used bacteria in which the nonpathogenic strain was encapsulated but the pathogenic strain was not. d. Griffith found that DNA released from dead (virulent) bacteria entered live (avirulent) bacteria and changed them genetically, causing them to become virulent.
For what reason might scientists change the most current classification system?
A) if more species became extinct B) if more types of vertebrates were discovered C) if more information became available on the evolutionary history of existing species D) if new species evolved
Based on the accompanying figure, the decline in the moose population in 1996 was most likely due to a(n):
a. predictable increase in the wolf population.
b. unpredictable increase in the wolf population.
c. decrease in the intrinsic rate of increase for the moose population.
d. decline in the food supply.
e. unknown disease organism.