Final answer:
Tertiary structure in DNA is known as supercoiling, which allows DNA molecules to be compacted within a cell. This should not be confused with the tertiary protein structure formed from the folding of alpha-helix and beta-pleated sheet secondary structures.
Step-by-step explanation:
The tertiary structure in DNA is also known as supercoiling. In proteins, the primary structure refers to the sequence of amino acids, which forms secondary structures such as alpha-helix (a-helix) and beta-pleated sheets (B-pleated). These secondary structures fold onto themselves or combine in various ways to form the tertiary structure, which is crucial for the protein's function.
Please note that while the question seems to be about DNA, it actually involves concepts related to protein structure. In DNA, supercoiling is a form of tertiary structure that enables the long molecules to be compacted and fit within a cell.