Keystone predators can maintain species diversity in a community if they _____
A) competitively exclude other predators
B) prey on the community's dominant species
C) allow immigration of other predators
D) reduce the number of disruptions in the community
E) prey only on the least abundant species in the community
Answer: B
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Many enzyme catalyzed reactions are freely reversible; however, some key steps require separate enzymes for the reverse step in order to provide for independent regulation of anabolic and catabolic pathways.
Answer the following statement true (T) or false (F)
After growth in tissue culture, the infected cells lyse and the virus may be harvested from
A. the lysate, the liquid supernatant after centrifugation. B. the remainder. C. the quantal layer. D. the monolayer.
Which of the following statements are true of xylem?
_____ It is found in all land plants. _____ It assists in conducting materials, such as water and minerals, throughout the plant. _____ It provides structural support to the plant. _____ It is found in the gametophyte generation, but not in the sporophyte. _____ It contains specialized cells known as tracheids.
Viral DNA inserted into a chromosome of the host is:
a. A carrier b. A phage c. A reservoir d. A prophage e. A lytic infection