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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Ammonia (NH3) is converted to nitrite (--NO2) by
A. decomposers. B. nitrogen-fixing bacteria. C. nitrifying bacteria. D. denitrifying bacteria.
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.
The term for the use of microorganisms to restore damaged environments is
A) epidemiology. B) bioremediation. C) chemotherapy. D) serology. E) ecology.
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