The source of variation among microorganisms that were once identical is
A. antibiotic resistance.
B. virulence factors.
C. sigma factors.
D. mutation.
D
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Which of the following laboratory procedures is used for culturing animal viruses in the laboratory?
A) cell cultures B) broth cultures C) embryonated eggs D) both cell cultures and embryonated eggs E) synthetic cytoplasm
A. Ecological function
A. Yeast cells suck in air when trapped in dough. B. Carbon dioxide is produced during fermentation. C. Multiplication of yeast physically expands the dough. D. The fungal cells burst causes the dough to expand.
A keloid is defined as a(n):
a. excessive collage formation that often results in a hard, raised scar b. fibrous bands that can form internally after surgery c. tissue separation d. part of the healing process of larger scars
The volcanic island Selkirk arose from the North Atlantic off Iceland in 1948. The first organisms to start living there are said to be ________
A) rogue organisms B) climax species C) central species D) pioneer species