Which one of the following is believed to have served as the first electron donor?
A. Mg2+
B. 18O2
C. Fe2+
D. NADPH
E. 35S
C
Biology & Microbiology
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An insect population that becomes resistant to a commonly used insecticide is an example of _____.
A. natural selection B. a founder effect C. disruptive selection D. gene flow E. genetic drift
Biology & Microbiology
All microscopes have objective "lenses."
a. True b. False
Biology & Microbiology
A base ________
A) removes H2O molecules from a solution B) decreases the pH of a solution C) removes OH— ions from a solution D) removes H+ ions from a solution
Biology & Microbiology
In what way are a human and a crab similar?
A. Both have muscles that pull against rigid skeletons. B. Vertebrates and arthropods are deuterostomes. C. Both have closed circulatory systems. D. Both have a continuous growth pattern.
Biology & Microbiology