Could your lifestyle or the food you eat influence evolution? How?
What will be an ideal response?
Such influence can occur through epigenetics, which involves a stable alteration in gene expression without changes in DNA sequence. DNA methylation and histone acetylation alter gene expression by affecting how tightly packaged the DNA molecule is. DNA methylation (adding a methyl group to the cytosine bases in DNA) turns off the activity of a gene by bringing in proteins that act to compact DNA into a tighter form. Histone acetylation, in contrast, makes the DNA less tightly coiled and gene expression easier. DNA methylation patterns can be affected by environmental factors, cause disease, be transmitted through generations, and potentially influence evolution.
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The redness and induration found after a tuberculin skin test involve the action of
A. sensitized T cells. B. IgE. C. complement. D. basophil cells.
A behavioral pattern can be triggered by a(n):
a. circadian rhythm. b. environmental stimulus. c. positive reinforcement. d. psychological stimulus. e. sign stimulus.
For over ________ years, dinosaurs dominated the face of the earth.
A. 1 million B. 10 million C. 150 million D. 10 thousand E. 50 million
Tungsten is a reagent used in the
A) acid-fast stain. B) electron microscopy stain. C) endospore stain. D) flagellar stain. E) negative stain.