1. Why do you suppose Streptomyces griseus produces an enzyme that inactivates streptomycin? Why is this enzym

Answer 1

Boo to Wikipedia cut and pasters. Thumbs down, you could at least try to summarize in a way that addresses the question.

Streptomycin is an antibiotic, it kills many bacteria including most streptomyces strains. If a bacteria that was susceptible to streptomycin mutated to produce an enzyme that inactivated it would have a huge advantage over other bacteria that it normally competes with. It would reproduce more, especially if streptomycin was frequently around in the environment. A higher percentage of the future generations would have the DNA of this strain, including the streptomycin inactivating enzyme. This is natural selection and evolution.

As to the second part of your question, I can't answer it. If you're getting your homework done for free would it kill you to type out the whole question?

Answer 2

Streptomycin/Streptomyces griseus

Streptomycin is an antibiotic drug, the first of a class of drugs called aminoglycosides to be discovered, and was the first antibiotic remedy for tuberculosis. It is derived from the actinobacterium Streptomyces griseus. Streptomycin stops bacterial growth by damaging cell membranes and inhibiting protein synthesis. Specifically, it binds to the 16S rRNA of the bacterial ribosome, which prevents the release of the growing protein (polypeptide chain). Humans have structurally different ribosomes than bacteria, thereby allowing the selectivity of this antibiotic for bacteria. Streptomycin cannot be given orally, but must be administered by regular intramuscular injection. An adverse effect of this medicine is ototoxicity. It can result in permanent hearing loss.