Which of the following best defines a gene?

Question

BlackTom AI · Accepted Answer

To begin, let's restate what's being asked: the question asks for the definition of a gene.
Option provided: 'A segment of DNA that codes for a specific protein or RNA molecule.'
Analysis of this option: this definition aligns with the core molecular biology concept of a gene as a discrete DNA stretch that contains the information to produce a functional product—typically a protein or a molecule of RNA. It captures the key idea that genes are the hereditary units encoded in DNA responsible for transcoding biological function.
Note on missing options: the original item set includes an empty list for answer_options, so there are no alternative statements to evaluate here. In a typical multiple-choice context, one would compare multiple definitions to determine which best matches the scientific consensus. The absence of distractors means we can only assess the correctness of the provided statement.
Misconceptions to avoid when evaluating gene definitions in general: some might think a gene is simply a long stretch of DNA, or that it always codes for a protein; however, genes can code for RNA molecules that are not translated into proteins (such as tRNA or rRNA), and regulatory elements may influence gene expression without encoding a product themselves. This option explicitly mentions protein or RNA, which covers both protein-coding and some RNA-coding genes, aligning with accepted definitions.
In sum, given the content provided, the statement accurately defines a gene as a DNA segment that encodes a specific product (protein or RNA), which matches standard genetic definitions.

AGRI10051_2025_SM2 Revision Questions Weeks 1-4 UNMARKED

Which of the following best defines a gene?

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