Briefly describe 3 ecological roles of viruses
What will be an ideal response?
Viruses can suppress or cause declines in microbial blooms as they invade and lyses host cells. Viruses can alter biogeochemical cycles by bacterial lyses. This reduces the food available and releases nutrients. The dead bacteria also sink to ocean floor providing a source of food for benthic communities.
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Chromosomes exchange genetic information by
A. fertilization. B. mitosis. C. syngamy. D. DNA replication. E. crossing over.
To increase the sensitivity of direct Gram-stain examination of body fluid specimens, the specimens are usually:
a. incubated for 18 to 24 hours before stain-ing. b. centrifuged before staining. c. examined for at least 1 hour. d. stained for an additional 5 minutes.
A house plant that has been placed in the window will grow toward the source of light because auxin ____
a. becomes more concentrated on the illuminated side of the plant b. becomes less concentrated on the illuminated side of the plant c. becomes more concentrated in the roots of the plant d. inhibits the growth of cells on the shady side, so the cells on the sunny side grow faster e. is produced only when the sun shines
Which of the following is NOT one of the four major
intervals in the geologic time scale? a. Mesozoic b. Proterozoic c. Carboniferous d. Cenozoic e. Paleozoic