Question

A gel electrophoresis migration pattern displaying polymerase chain reaction (PCR) products shows four strong bands. The lengths of the four pieces of DNA are approximately in the ratio of 1:2:3:4. The longest band is cut out of the gel, and PCR is repeated with the same primers. Again, a ladder of the same four bands appears in the gel. What does this result reveal about the structure of the encoded protein? A) The protein is a tetramer of a single peptide. B) Up to four copies of the DNA ligate to form circular DNA molecules. C) Four copies of the protein-coding gene occur in the genome. D) The encoded protein contains four repeats of a specific sequence. E) Portions of the protein are encoded by four different genes.

          A gel electrophoresis migration pattern displaying polymerase chain reaction (PCR) products shows four strong bands. The lengths of the four pieces of DNA are approximately in the ratio of 1:2:3:4. The longest band is cut out of the gel, and PCR is repeated with the same primers. Again, a ladder of the same four bands appears in the gel. What does this result reveal about the structure of the encoded protein? A) The protein is a tetramer of a single peptide. B) Up to four copies of the DNA ligate to form circular DNA molecules. C) Four copies of the protein-coding gene occur in the genome. D) The encoded protein contains four repeats of a specific sequence. E) Portions of the protein are encoded by four different genes.

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