QQuestionBiology
QuestionBiology
What phrase best defines a gene?
A. A segment of DNA that codes for a protein
B. A molecule that carries genetic information
C. The basic physical and functional unit of heredity
D. All of the above
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Answer
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Step 1:I'll solve this problem step by step:
Step 2:: Analyze the definition of a gene
A gene is a fundamental concept in genetics that encompasses multiple important characteristics. Let's examine each option carefully.
Step 3:: Evaluate Option A
"A segment of DNA that codes for a protein" is technically correct, but incomplete. While many genes do code for proteins, not all genes directly produce proteins.
Step 4:: Evaluate Option B
"A molecule that carries genetic information" is too broad. DNA and RNA are molecules that carry genetic information, but not all molecules carrying genetic information are genes.
Step 5:: Evaluate Option C
"The basic physical and functional unit of heredity" is the most comprehensive and accurate definition. This description captures the essential nature of a gene: - Physical unit: A specific sequence of nucleotides - Functional unit: Capable of being expressed and transmitted - Unit of heredity: Passed from parents to offspring
Step 6:: Evaluate Option D
"All of the above" suggests that all previous statements are correct and complementary.
Final Answer
The basic physical and functional unit of heredity The most precise and complete definition of a gene is that it is the basic physical and functional unit of heredity, which encompasses its structural and functional characteristics most comprehensively.
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