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. An intercalating agent such as acridine orange
C. A DNA modifier such as an alkylating agent
D. A deaminating base such as nitrous oxide
Answer: C
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A main function of a plant's root system is to:
a. photosynthesize. b. absorb dissolved nutrients and water. c. absorb atmospheric carbon dioxide. d. capture sunlight. e. bear seed-containing fruits.
A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 8 picograms of DNA per nucleus. How many picograms would be found at the end of S and the end of G2?
A) 8; 8 B) 8; 16 C) 16; 8 D) 16; 16
Suppose you cross a pea plant with yellow, smooth seeds with one that has green, wrinkled seeds
You examine the seeds of 967 offspring and find that some have yellow, smooth seeds and some have yellow, wrinkled seeds, but no green seeds of either type show up. What is the genotype of the yellow-seeded parent? (Y = yellow, y = green; S = smooth, s = wrinkled) A) YYSS B) YySS C) YySs D) YYSs E) YYss
Some fungi postpone cytokinesis, producing
A) coenocytes. B) cysts. C) merozoites. D) schizonts. E) trophozoites.