When scientists described the sequences of the proteins of Haemophilus influenzae based on its DNA sequence, what did they find to be the major difference between noninfective strains and highly infective strains?
A) The infective strains have genes for glycolysis that the noninfective strains lack.
B) The noninfective strains lack the enzymes needed to synthesize amino acids.
C) Only the infective strains have surface proteins that attach the bacterium to respiratory tracts.
D) The noninfective strains lack open reading frames.
E) The strains have different regulatory sequences.

Question

Quizplus · Accepted Answer

The scientists found that only the infective strains of Haemophilus influenzae have surface proteins that attach the bacterium to respiratory tracts. This is a major difference between the two types of strains.

When Scientists Described the Sequences of the Proteins of Haemophilus