The EC50 for PTC
A. is the concentration of PTC that gives 50% of the maximal response
B. is determined in HEK cells by observing changes in cytoplasmic Ca +2
C. is determined by measuring the fluorescence of a molecule that changes its properties when bound to Ca+2
D. all of the above
Answer: D. all of the above
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Which of the following is NOT a characteristic of bacterial chromosomes?
A. They are single stranded. B. They are around 10? smaller than eukaryotic chromosomes. C. They contain gene coding regions and regulatory regions. D. They have 10-base-pair regions that control DNA folding. E. They have only one origin of replication.
The exposure of plants to low temperatures in order to stimulate flowering is called
a. cryptotropism. b. thigmotropism. c. vernalization. d. florigen. e. cryotropism.
The breakdown of pyruvate in the Krebs cycle
results in the release of a. energy. b. carbon dioxide. c. oxygen. d. hydrogen. e. all except oxygen.
The ________ model of population growth assumes that essential resources are unlimited and that the environment is constant
Fill in the blank(s) with correct word