Question

what must happen to a strand of polypeptides before it becomes a functioning protein?
a. a poly - a tail must be placed on its end.
b. its amino acids must be activated.
c. it must be folded into its proper shape.
d. its introns must be removed.

Explanation:

Proteins' functions depend on their three - dimensional shapes. Polypeptide chains need to fold correctly. A poly - A tail (A) is for mRNA. Amino acid activation (B) is for translation initiation. Intron removal (D) is for mRNA processing. Only folding (C) is crucial for a polypeptide to become a functional protein.

Answer:

C. It must be folded into its proper shape.