On a road trip in the American West, you see a prairie dog town-a colony of related animals. There are hundreds of prairie dogs, but only a subset are scanning for predators at any time. If a predator is spotted, a prairie dog barks to warn the rest of the colony, who dart into their burrows. Prairie dogs have a complex vocabulary of alarm calls, which differ to indicate hawks, coyotes, or humans. What feature of group living is best illustrated by the prairie dog alarm system?
A. reciprocal altruism
B. haplodiploidy
C. the many-eyes hypothesis
D. the geometry of the selfish herd
E. optimality theory
Answer: C
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In recombinant DNA experiments, ______ is used to cut pieces of DNA, and ______ joins these segments to form recombinant DNA
A. restriction enzyme; DNA ligase B. a transposon; a restriction enzyme C. a plasmid; DNA ligase D. DNA ligase; a restriction enzyme E. DNA ligase; a plasmid
Organisms usually have only a single transport system for any nutrient.
Answer the following statement true (T) or false (F)
Salinity is more variable in the intertidal zone of rocky shores than in sandy and muddy shores
Indicate whether the statement is true or false
What type of cells are joined end-to-end, conduct water and are connected to each other with strips of wall material?
A. tracheids B. vessel members C. sieve cells D. sieve tube members E. companion cells