analysis of the fractions for mrna specific for the lac and trp operons by rna-deoxyribonucleic acid hydridization showed somewhat larger amounts on membrane than on free polyribosomes , but enrichment for nascent alkaline phosphatase ( a secreted protein ) on membranes was consistently greater , suggesting that polyribosomes making secreted proteins are more tightly bound to membranes .
C0035696
mrna
C0035668
rna