The __________ species concept defines a species as a population whose members do not interbreed
in nature.
a. genetic
b. ecological
c. morphological
d. biological
e. evolutionary
D
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Cloning a gene involves all of the following except
A. introducing ligated DNA into E. coli cells. B. insertion of the gene into an appropriate vector. C. expression of the vector and the gene in a cell-free environment. D. isolating the fragment of DNA containing the desired gene.
Clay compounds were thought to be original
sites for the formation of
a. nucleotide strands. b. fat globules. c. short polysaccharides. d. amino acid chains. e. sugar-protein complexes.
The three antibodies that are monomers include
__________, __________, and __________. Fill in the blank(s) with the appropriate word(s).
Which plant tissue did the first observed cells come from?
a. cork b. pollen c. a maple leaf d. human skin