An injection of pooled human gamma globulin may provide passive immunity to humans from hepatitis A because it contains __________.

A) antibodies
B) T helper cells
C) T cytotoxic cells
D) B cells


Ans: A) antibodies

Biology & Microbiology

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If RNA polymerase is missing in E coli _____, then transcription initiation would not occur at the appropriate initiation sites

A) amino acids B) mRNA C) sigma D) the holoenzyme

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How are the gastric glands in the stomach protected from digestion by the enzyme they produce?

What will be an ideal response?

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Approximately, what percentage of CO2 is converted to bicarbonate ions before it is transported by blood?

A. 70% B. 50% C. 10% D. 0% E. 100%

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In sanitary landfills, the primary safeguard against groundwater contamination is to:

a. do nothing as groundwater contamination is not a problem with landfills. b. line the landfill with impermeable clay and plastic. c. design the landfill to use the natural slope of the land so water runs downhill without being contaminated. d. locate landfills on industrial sites where groundwater is not used for drinking.

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