Polyribosomes .
protect the mRNA from degradation
increase the rate of polypeptide synthesis from a single mRNA
allow coupled transcription and translation
increase the rate of transcription

B. Increase the rate of polypeptide synthesis from a single mRNA.

Hope this helped.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?