Describe how the Ames test is used to determine whether a particular chemical is mutagenic
What will be an ideal response?
Strains of the bacteria Salmonella typhimurium that are auxotrophic for histidine are plated on a histidine-lacking nutrient agar with rat liver cells. The unknown chemical is added to the agar plate, and the plate is observed for bacterial growth that would indicate reverse mutations caused by the chemical resulting in histidine prototrophy.
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Which of the following is NOT a process of aerobic respiration?
A. citric acid cycle B. glycolysis C. acetyl CoA formation D. oxidative phosphorylation E. lactate fermentation
Peripheral proteins are linked to either surface of the plasma membrane by:
a. covalent disulfide bonds. b. associating with fatty acids through hydrophobic interactions. c. associating with glycoproteins on the inner membrane surface. d. bonding to integral proteins through noncovalent interactions. e. embedding in one side of the membrane and, thus, not extending through to the other side.
Natural selection has led to the evolution of diverse natural history strategies, which have in common
A) many offspring per reproductive episode. B) limitation only by density-independent limiting factors. C) adaptation to stable environments. D) maximum lifetime reproductive success. E) relatively large offspring
Genetic recombination allows bacterial cells to receive small amounts of ________ from other cells or from the environment.
A) protein B) DNA C) RNA D) cytoplasm