Final answer:
The described antibiotic is neomycin, a potent aminoglycoside produced by Streptomyces spp., included in neosporin, and primarily effective against gram-negative bacteria.
Step-by-step explanation:
The antibiotic described is produced by Streptomyces spp., has a cyclohexane ring plus amino sugar, is a part of neosporin, effective against a broad spectrum of mostly gram-negative bacteria, and it binds to the 30S subunit of bacterial ribosomes inhibiting protein synthesis which makes it bactericidal. Its toxicity can lead to deafness and constitutes about 3% of all antibiotics. The correct answer to this description is neomycin (c). Neomycin falls under the class of aminoglycosides, known for their ability to bind to the 30S subunit and malfunction the protein synthesis process leading to the death of bacterial cells. Other antibiotics such as streptomycin also belong to this class, but neomycin's inclusion in products like neosporin and its broad-spectrum activity, mainly against gram-negative bacteria, are distinguishing factors. Notably, neomycin's toxicity can result in ototoxic effects, potentially leading to hearing loss.