The chromosomal theory of inheritance was first proposed by ___________
A. Mendel
B. Boveri and Sutton
C. Darwin and Mendel
D. Weismann and Boveri
B
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Purple sulfur bacteria and filamentous sulfur-oxidizers both
A. accumulate sulfur as intracellular granules. B. fix nitrogen. C. produce oxygen from carbon dioxide. D. use gliding motility.
Moths have an immunoglobulin-family protein called ____, which binds to pathogens and enhances their
phagocytosis.
a. hemolysin b. cadherin c. interleukin d. hemolin e. defensin
Population size depends upon
a. deaths. b. births. c. migration. d. immigration. e. all of these.
During the last decade, the U.S. Fish and Wildlife Service has worked to reestablish the critically endangered California condor in its last stronghold, the mountains of southern California
Recently, the service has also tried to establish a second population in the Grand Canyon region of Arizona. Why would the Fish and Wildlife Service consider it a high priority to establish two populations that are geographically distant from each other? A) Multiple condor populations reduce inbreeding. B) Multiple condor populations provide more opportunities for people to view the endangered species, which may cause more people to be concerned with its fate. C) Multiple condor populations reduce genetic drift within each population. D) Multiple condor populations reduce the risk of extinction due to localized catastrophes.