wild-type cells of the unicellular green alga chlamydomonas reinhardi have been grown for several generations in the presence of rifampicin , an inhibitor of chloroplast dna-dependent rna polymerase , spectinomycin and chloramphenicol , two inhibitors of protein synthesis on chloroplast ribosomes , and cycloheximide , an inhibitor of protein synthesis on cytoplasmic ribosomes .
C0010834
cytoplasmic
C0035553
ribosomes