The use of a brief electrical shock to introduce DNA into bacterial cells is called ________
A) gene therapy
B) electroporation
C) electrophoresis
D) electrocution
E) chromatography
B
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Substances that induce an immune response are known as
A) immunogens. B) antigens. C) immunoglobins. D) antigen-presenting cells.
Biological membranes are held together mainly by
a. hydrogen bonds between lipid molecules. b. hydration layers over lipid molecules. c. exclusion of the nonpolar regions of lipids by water. d. hydrogen bonds between water molecules. e. surface tension at the interface between layers of water molecules.
A biomass pyramid illustrates the ____ of all organisms at each trophic level
a. size b. number c. dry weight d. total weight e. total utilization of materials
Sexual reproduction increases genetic variability through
a. the exchange of genetic information between male and female gametes during meiosis I. b. the random separation of homologous chromosomes. c. the union of male and female gametes. d. crossing over, independent assortment, and random fertilization. e. random assortment of male and female chromosomes.