thr refers to a gene that governs a cells ability to synthesize threonine from inorganic precursors. The
designation thr+ indicates:
a. that the allele is normal.
b. that the allele is the mutant allele.
c. that the bacterium is biologically active.
d. that the bacterium is biologically inactive.
e. that the bacterium cannot make its own threonine.
A
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