The concept that human and animal diseases are caused by microorganisms is called the
A. disease theory.
B. causative theory.
C. germ theory.
D. cell theory.
Answer: C
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Plants usually grow best in sandy soils
a. True b. False
Some amphibians:a
may exchange gases across their body surfaces. b. all have fairly simple, book lungs. c. all have gills and swim bladders, homologous to those found in fishes. d. are characterized by having parabronchi across which most of the gas exchange occurs. e. have a large oxygen demand that is met by using a countercurrent gas exchange mechanism
Compared to small cells, large cells have more trouble
A) dividing. B) producing daughter cells. C) storing needed materials and waste products. D) moving needed materials in and waste products out.
The envelope of a mumps virus
A) helps the virus enter the cell. B) is coded by host genes. C) helps the virus insert its DNA into the host cell genome. D) accounts for viral resistance to antibiotics.