A cistron represents ________?
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Answer: C. Functional unit gene
Explanation
A cistron is defined as the functional unit of inheritance corresponding to a gene that encodes a specific polypeptide. Molecular geneticists use this term to describe a DNA sequence that specifies a functional RNA or protein product. It represents the genetic unit tested by the complementation test in classical genetics. Genes are composed of long sequences of nucleotides organized into coding and non-coding regions. Transcription converts the DNA cistron sequence into messenger RNA inside the cell nucleus. Genetic code translation then uses this mRNA template to assemble amino acids into proteins.
Understanding cistron structure helps researchers study gene expression and hereditary disease mechanisms. Mutations within a cistron can alter the resulting protein structure and cause phenotypic changes. Genetic engineering relies on isolating functional cistrons to express recombinant proteins in hosts. Structural of gene is a vague phrase poorly describing the precise functional definition of a cistron. Functional unit of RNA is too narrow since cistrons primarily encode functional proteins. Replication unit of gene refers to replicons rather than the functional polypeptide-coding cistron.
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