In comparison to the upper intertidal zone, species in the lower intertidal zone are more apt to
A) be desiccation tolerant.
B) have a lower metabolic rate.
C) have lower resource requirements.
D) be better competitors.
D
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Bacteria in the genus Salmonella are frequent causes of serious food contamination. Which of the following methods would provide rapid confirmation that a Salmonella species was a contaminant in food suspected of causing food "poisoning"?
A) phage typing B) biochemical tests C) physical characteristics D) analysis of nucleic acids E) serological tests
Which of the following is NOT a valid difference between traditional and modern forms of biotechnology?
A) Modern biotechnology can isolate and manipulate individual genes. B) Traditional biotechnology was based solely on selective breeding. C) Modern forms of biotechnology are slower than traditional forms of biotechnology. D) Traditional biotechnology can produce cloned animals with new genes.
E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged
What density distribution of DNA would you expect in this experiment? A) one high-density and one low-density band B) one intermediate-density band C) one high-density and one intermediate-density band D) one low-density and one intermediate-density band E) one low-density band
Species interactions between members of a
community include __________, which harms both species. Fill in the blank(s) with the appropriate word(s).