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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

70. The definition of a cistron, which is often used interchangeably with the structural term “gene,” is a segment of DNA that

A. Codes for a single functional transfer RNA molecule only
B. Specifies the complete nucleotide sequence of a single polypeptide chain
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C. Regulates the packing of histones in chromatin
D. Initiates DNA replication at a fixed chromosomal origin

📝 Explanation

A cistron is a genetic unit defined by the cis-trans position test, matching the DNA sequence needed to build one polypeptide.

📖 Additional Information

  • Codes for a single functional transfer RNA molecule only
  • Specifies the complete nucleotide sequence of a single polypeptide chain
  • Regulates the packing of histones in chromatin
  • Initiates DNA replication at a fixed chromosomal origin

A cistron is a genetic unit defined by the cis-trans position test, matching the DNA sequence needed to build one polypeptide.

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