The ____ drives inhalation by stimulating contraction of the diaphragm and intercostal muscles
a. ventral interneuron group
b. pons interneuron groups
c. carotid bodies
d. dorsal respiratory group
e. aortic bodies
ANSWER: d
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The most fundamental and important molecule that distinguishes living systems from nonliving matter
is ____.
a. DNA b. deoxyribonucleic acid c. glucose d. fructose e. a and b only
A ____ is required to transfer genes from one organism to another
a. vector b. reverse transcriptase c. transport molecule d. genetic probe e. PCR device
DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?
A) All habitats should have received applications of DDT at about the same time. B) The frequency of DDT application should have been higher. C) None of the insect pests would have genetic variations that resulted in DDT resistance. D) DDT application should have been continual.
Consider each of the following crosses and determine which pair of animals belongs to the same species.
A. Horse ´ donkey—does not occur naturally; offspring sterile B. Eastern milk snake ´ coastal plain milk snake—occurs naturally; offspring fertile C. Lion ´ Tiger—does not occur naturally; offspring sterile D. None of these answers is correct.