Which of the following results in a spontaneous mutation?
A. free radicals produced by cellular metabolism
B. exposure to ultraviolet light
C. exposure to benzo (a)-pyrene, a chemical substance found in cigarette smoke
D. exposure to ultraviolet light and benzo (a)-pyrene
E. exposure to X-rays
A. free radicals produced by cellular metabolism
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The _____ are mollusks with a hinged shell
a. bivalves b. barnacles c. gastropods d. cephalopods
In this diagram, which of the following numbers represents the actual event of egg activation?
A. I
B. II
C. III
D. IV
E. V
An ecologist conducts a greenhouse experiment to study the effect of nitrogen concentration on the productivity of sunflower seedlings. What is the independent variable in this experiment?
A) productivity of sunflowers B) concentration of nitrogen C) the number of sunflower seeds planted D) the daily amount of water given to each sunflower seed
Studies of Neurospora led to the ________ statement, whereas studies of human hemoglobin led to the ________ statement
Fill in the blank(s) with correct word