How much of Europe’s population was wiped out by the Black Death?
a. 1/2
b. 1/3
c. 1/4
d. 1/5
e. 1/6
ANSWER: b
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Forests and other natural ecosystems, such as wetlands, exhibit the "sponge effect," meaning that they
A) soak up water from runoff and rainfall, and thus accumulate pollutants B) soak up pollutants from runoff and rainfall, releasing it quickly into streams and rivers and raising their levels C) soak up water from runoff and rainfall, saturating nearby ecosystems D) soak up water from runoff and rainfall, releasing it at a regular rate that moderates flooding of streams and rivers E) draw water away from rivers and streams, lowering their levels
The best definition of antigen is
A) Something foreign in the body. B) A chemical that elicits an antibody response and can combine with these antibodies. C) A chemical that combines with antibodies. D) A pathogen. E) A protein that combines with antibodies.
Which of the following antibiotics is an inhibitor of DNA gyrase?
A) ethambutol B) ciprofloxacin C) tobramycin D) neomycin
DNA replication involves the synthesis of an RNA primer on one strand of the DNA
Indicate whether the statement is true or false.