A) Alexander Fleming.
B) Louis Pasteur.
C) Edward Jenner.
D) Robert Koch.
E) Paul Ehrlich.

A) resist denaturation.
B) react more efficiently with DNA.
C) are easily denatured.
D) have very few amino acids.
E) are larger than those of mesophiles.

A) Biofilms are very rarely involved in human bacterial infections.
B) Biofilms may protect organisms against harmful chemicals.
C) Biofilms are a peptidoglycan-encased community of microorganisms.
D) Biofilms may significantly inhibit bioremediation efforts.
E) Biofilms are very seldom found in a natural environment.