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

Biology & Microbiology

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Ammonia (NH3) is converted to nitrite (--NO2) by 

A. decomposers. B. nitrogen-fixing bacteria. C. nitrifying bacteria. D. denitrifying bacteria.

Biology & Microbiology

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.

Biology & Microbiology

The term for the use of microorganisms to restore damaged environments is

A) epidemiology. B) bioremediation. C) chemotherapy. D) serology. E) ecology.

Biology & Microbiology

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

Biology & Microbiology