Which Chemical is Synthesized by Some Sponges and Acts as an Antibiotic

Question

Which chemical is synthesized by some sponges and acts as an antibiotic?
A)streptomycin
B)spongin
C)calcium carbonate
D)silica
E)cribrostatin

Accepted Answer

Cribrostatin is a chemical synthesized by some sponges that acts as an antibiotic. The other choices, streptomycin, spongin, calcium carbonate, and silica, are not synthesized by sponges as antibiotics.