(B) : $A$ cistron (or gene) is a segment of $DNA$ that contains the information for coding a specific polypeptide chain or a functional $RNA$ molecule

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(B) : $A$ cistron (or gene) is a segment of $DNA$ that contains the information for coding a specific polypeptide chain or a functional $RNA$ molecule (i.e.,transfer $RNA$ or ribosomal $RNA$).Hence,a cistron is considered a unit of function.In modern genetics,such a gene is referred to as a structural gene.