All of the following are foodborne pathogens except
A. Streptococcus.
B. Campylobacter.
C. Salmonella.
D. Staphylococcus aureus.
E. Clostridium.
Answer: A
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Muscle contraction occurs in a cyclic process. Which of the following sequences is in the correct order?
A) power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin B) cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin C) cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation D) cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke E) cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin
The ____ gives structure to many unwalled, single-celled protists
a. contractile vacuole
b. pellicle c. Golgi body d. endoplasmic reticulum e. nucleus
The letter "F" from the above figure represents
a. complement. b. MHC markers with antigen expressed to the surface of a cell. c. lysosome fusing with a phagosome. d. plasma membranes fusing. e. MHC recycling
Which of the following characteristics distinguish Darwin's theory from earlier explanations of biological diversity and adaptive traits?
a. Darwin provided purely spiritual, rather than physical, explanations for the origins of biological diversity. b. Darwin recognized that evolutionary change occurs in groups of organisms rather than in individuals: some members of a group survive and reproduce more successfully than others. c. Darwin described evolution as a single-stage process: variations arise within groups, natural selection eliminates unsuccessful variations, and the next generation inherits successful variations. d. Like Lamarck, Darwin understood that evolution does not occur because some organisms function worse than others in a particular environment.