According to the text, which antibiotic(s) can pass easily through the gram-negative bacterial cell wall and interfere with protein synthesis?

streptomycin

Explanation:

Streptomycin is also known as protein synthesis inhibitor. It also have the ability to cross the cell wall of bacteria and interfere with the machinery of bacterial protein translation machinery. Streptomycin bind to the 16S rRNA of the 30S subunit of ribosomes which will results in the loss of its ability to read the codon and thus stop the protein synthesis. the protein synthesis will lead to the death of bacterial cell.

streptomycin is useful against both gram positive and gram negative bacteria.

allowed for the prediction of the properties of missing elements.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.