Small pox
a. kills up to a third of all people it infects.
b. kills over half of all people it infects.
c. is only found in subtropical climates.
d. was eradicated by 1850.
e. is not described by any of these.
A
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The cofactors required for enzyme activity often are
a. allosteric inhibitors. b. allosteric activators. c. charged amino acids. d. large, complex organic molecules. e. competitive inhibitors.
On which continent would you have seen the very earliest members of Homo sapiens?
A. Europe B. Africa C. Australia D. Asia
Both mitochondria and chloroplasts are
thought to have evolved by the process of
a. endosymbiosis. b. sexual selection. c. allopatric speciation. d. sympatric speciation. e. more than one of these.
Which of the following is a purine base found in nucleotides?
a. uricil b. steroid c. guanine d. cytosine e. thymine