A solution with a pH of 7.4 ____
a. is considered an acid
b. has more H+ than OHc.
has equal numbers of H+ and OHd.
has a pH similar to ammonia
e. is similar in acidity to normal body fluids
ANSWER: e
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Answer the following statement true (T) or false (F)
The disease caused by Streptococcus mutans is
A. plague. B. trachoma. C. dental decay or caries. D. atypical pneumonia.
Black-bellied seedcrackers have either small beaks (better for eating soft seeds) or large beaks (better for hard seeds). There are no seeds of intermediate hardness; therefore, which kind of selection acts on beak size in seedcrackers?
A. Stabilizing selection B. Directional selection C. Disruptive selection
The earliest discovered fossils are of ________ dating back to ________ years ago
A) single-celled eukaryotes; 4.5 billion B) prokaryotes; 3.5 billion C) algae; 1 billion D) fish; 600 million