The variable in the butterfly experiment is
a. butterfly wing pattern color.
b. butterfly species.
c. bird predator species.
d. rainforest region used.
e. percentage of survivors.
Answer: a
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When a vector that employs the lacZ gene as a second marker is used in a cloning experiment, bacteria that harbor the recombinant DNA will give rise to
A. red colonies. B. white colonies. C. blue colonies. D. All of the choices are correct.
Which of the following best explains why food is not energy?
a. Energy is exhaustive, and food is not. b. Food is exhaustive, and energy is not. c. Food can make us fat, and energy cannot. d. Energy can make us fat, and food cannot.
What type of symbiotic relationship is exemplified by mycorrhizal fungi?
A. Atavism B. Parasitism C. Mutualism D. Commensalism
Because oxygen is more electronegative than hydrogen, the water molecule is
A. ionic. B. nonpolar. C. hydrophilic. D. hydrophobic. E. polar.