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

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All microscopes have objective "lenses."

a. True b. False

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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