Which taste buds are the most sensitive?
a. umami
b. sweet
c. sour
d. bitter
e. salty
D
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Rickettsias enter host cells by inducing ________.
Fill in the blank(s) with the appropriate word(s).
The nematode Caenorhabditis elegans is important to human medicine because:
A. It causes elephantiasis, a disease of the lymph glands that causes the legs of humans to swell. B. It is an intestinal parasite in human digestive tracts. C. It has programmed cell death and therefore is useful in cancer and AIDS research. D. It causes an infection that produces severe anal itching. E. It is transmitted by mosquitoes and causes high fevers.
Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in the original sample?
A) 36 B) 9 C) 18 D) 4 E) 72
Quorum sensing is used by bacterial cells to determine which of the following?
A. the size of the population B. the availability of nutrients C. the speed of water flow D. the density of the population