QQuestionBiology
QuestionBiology
"Which phrase describes a gene in its simplest form?
A. a looped portion of RNA
B. a part of a protein
C. a molecule found in the endoplasmic reticulum
D. a segment of DNA"
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand the key characteristics of a gene
A gene is a fundamental unit of heredity that contains the instructions for making a specific protein or set of proteins. To identify its most basic description, we need to consider its core structural composition.
Step 3:: Analyze each option carefully
A. "a looped portion of RNA" - This is incorrect. While RNA is involved in gene expression, it is not the gene itself. B. "a part of a protein" - This is incorrect. Genes actually contain the instructions for making proteins, not a portion of a protein. C. "a molecule found in the endoplasmic reticulum" - This is incorrect. While proteins may be synthesized near the endoplasmic reticulum, genes are not located there. D. "a segment of DNA" - This is the correct answer. A gene is fundamentally a specific segment or sequence of DNA that contains the genetic instructions for a particular trait or function.
Step 4:: Confirm the scientific definition
In molecular biology, a gene is defined as a specific sequence of nucleotides in DNA that encodes the synthesis of a gene product, either RNA or protein.
Final Answer
D. a segment of DNA
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