Final answer:
The leader sequence in both heavy and light chain DNA sequences of antibodies has the same function in both cases; it facilitates the synthesis process and is not translated into protein, making the answer to the statement true.
Step-by-step explanation:
The leader sequence in the heavy and light chain DNA of antibodies indeed has the same function in both cases. The leader sequence is a part of the DNA sequences that is not translated into the amino acid sequence of the protein. Instead, it serves as a signal for the cellular machinery responsible for protein synthesis, such as the identification of the starting point for transcription and the process of directing the nascent polypeptide to the correct location within or outside the cell.
In the context of the question, it's true that these leader sequences are present in both heavy and light chain DNA sequences and have the same role in guiding the antibody's synthesis process. Thus, the correct answer to the question is (a) True.