QQuestionBiology
QuestionBiology
Which phrase correctly defines a gene?
A. a complete protein
B. a segment of DNA
C. a segment of a protein
D. a part of the cell membrane
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Answer
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Step 1:I'll solve this biology problem step by step:
Step 2:: Understand the Definition of a Gene
A gene is a specific segment of DNA that contains the instructions for making a specific protein or set of proteins. This genetic information is encoded in the DNA sequence and serves as a blueprint for protein production.
Step 3:: Analyze the Given Options
Let's evaluate each option: A. "a complete protein" - Incorrect. A protein is the product of a gene, not the gene itself. B. "a segment of DNA" - Correct. This accurately describes a gene's fundamental nature. C. "a segment of a protein" - Incorrect. Proteins are made from genes, not the other way around. D. "a part of the cell membrane" - Incorrect. Genes are located in the cell nucleus (in eukaryotes) or nucleoid region (in prokaryotes), not in the cell membrane.
Step 4:: Provide Scientific Context
Genes are composed of nucleotide sequences that: - Contain genetic instructions - Can be transcribed into RNA - Can be translated into proteins - Are located on chromosomes - Determine inherited characteristics
Final Answer
B. a segment of DNA
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