If a region of DNA contained numerous mismatches due to a modifying agent that caused methylation of guanine, which of the following mutagens is most likely the cause?
A. Ionizing energy such as gamma radiation
B. A DNA modifier such as an alkylating agent
C. A deaminating base such as nitrous oxide
D. An intercalating agent such as acridine orange
Answer: B
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The reactions in the pathways of glycolysis and the citric acid cycle harvest the high-energy electrons stored in glucose. Therefore, these pathways _______________
A. are catabolic pathways B. are anabolic pathways C. take place in animal cells, but not in plant cells D. involve the reduction of glucose and its metabolic intermediates
Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What will be an ideal response?
Select the plant behavior that arises from internal stimuli.
A. Phototropism. B. Thigmotropism. C. Cytokinins promoting cell division. D. Nondevelopmental formation of aerenchyma.
Cell-cycle checkpoints temporarily block key events from being initiated during the cell cycle
__________________ Indicate whether the statement is true or false.