[Solved] The effectiveness of DNA vaccines stems from the effective production of antibodies against the naked DNA molecule. Representative: Someone or something that serves as a typical example or an agent for others. Population: In the context of statistics and research, it refers to the total group of individuals or items from which a sample may be drawn for study. Operational Definition: A clear, precise definition of a term in a study, based on measurable conditions or behaviors. Confusion: A state of perplexity or disorientation, often due to a lack of understanding or clarity.