Chemotaxis refers to the ability to
A. move in response to light.
B. move in response to a chemical.
C. not move in response to a chemical.
D. transport desired molecules into cell.
E. None of the choices is correct.
Ans: B. move in response to a chemical.
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Urea agar is set up for quality control purposes using two Trichophyton spp.—T. mentagrophytes and T. rubrum. After the appropriate amount of incubation, both organisms are negative. Which one of the following statements explains this discrepancy?
a. The medium is most likely expired. b. These two Trichophyton spp. are poor choices for quality control. c. The phenol red indicator is not working because both organisms are positive for urea. d. No discrepancy is present; both organisms are negative for urease activity.
It is estimated that there are fewer than 100 genetic diseases caused by single gene mutations in humans.
Answer the following statement true (T) or false (F)
The figure listed above is known as
a. a book lung. b. a tracheal system. c. gills. d. a lung micrograph. e. none of these
Cryptosporidium parvum
A. Belongs to the phylum Retortamonada; extracellular; located in the small intestine; asexual reproduction; direct life cycle B. Belongs to the phylum Apicomplexa; intracellular; located in the blood; sexual and asexual reproduction; indirect life cycle C. Belongs to the phylum Apicomplexa; intracellular; located in the small intestine; sexual and asexual reproduction; direct life cycle D. Belongs to the phylum Retortamonada; intracellular; located in different body tissues; Aasexual reproduction; indirect life cycle