Which specific cells are infected by the HIV virus?
A) Killer B cells
B) Helper T cells
C) Red blood cells
D) NK cells
B
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Hairlessness in dogs is inherited from a single dominant allele. Inheriting two dominant alleles is lethal for an embryo. Penelope, a hairless dog mates with Arnold, a dog with hair. The probability Penelope will have hairless puppies is
A) 3/4. B) 2/3. C) 1/4. D) 1/2.
Traditionally, chymosin used in the food industry to make cheese was extracted from ____
a. mold fermentation b. yeast fermentation c. sheep stomachs d. bacterial fermentation e. calf stomachs
Ammonia (NH3) is converted to nitrite (--NO2) by
A. decomposers. B. nitrogen-fixing bacteria. C. nitrifying bacteria. D. denitrifying bacteria.
The term for the use of microorganisms to restore damaged environments is
A) epidemiology. B) bioremediation. C) chemotherapy. D) serology. E) ecology.