Which two types of cells form myelin sheaths?
A. Schwann cells and microglia
B. astrocytes and oligodendrocytes
C. microglia and oligodendrocytes
D. oligodendrocytes and Schwann cells
E. microglia and astrocytes
Answer: D
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What is one function of the structure labeled A in the accompanying figure?
a. attachment b. locomotion c. protein-making d. breathing e. communication
The stage of an infectious disease when specific signs and symptoms are seen and the pathogen is at peak activity is
A. convalescent stage. B. incubation period. C. prodromal stage. D. period of invasion. E. All of these choices are correct.
Why are most autotrophs referred to as the producers of the biosphere?
What will be an ideal response?
E. coli 0157:H7 characteristics include all the following except
A. it only causes occupational illness in people who work with animals. B. it is transmitted by ingestion of contaminated, undercooked food, especially hamburger. C. it causes a bloody diarrhea. D. it is reservoir is cattle intestines. E. some cases go on to hemolytic uremic syndrome (HUS) with possible kidney failure.