Another Isolate of Streptococcus Pneumoniae from a Patient with Meningitis

Another isolate of Streptococcus pneumoniae from a patient with meningitis is also incubated with low-dose radioactive ceftriaxone and subjected to protein electrophoresis.  Only two bands are detected using radioautography.  Which of the following best explains the observed finding?

A) Action of beta-lactamases
B) Change in protein structure
C) Salvage metabolic pathway
D) Transmembranous efflux pumps
E) Upregulation of protein synthesis

Correct Answer:

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