本题目来源于试卷: Continuity and Change D.8 Inheritance，类别为 IB生物学
[单选题]
Which of these statements is a correctfb;,15qy cfc uci+q,t definition for a gene?/giyq)yx yf)-+e9l 6fgj 0qu p
A. A gene is the length of chromosome
B. A gene is a length of DNA that is wrapped around histones
C. A gene is a heritable factor made of DNA that influences a specific characteristic
D. Genes control all characteristics of an organism
参考答案: C
本题详细解析:
Choice C is a correct definition of a gene. Chromosomes are made of DNA and protein (Choice A), while genes are only made of DNA. When DNA is at various levels of supercoiling, it is wrapped around histone proteins. However, the presence of histones is not part of the definition of a gene (Choice B). Genes control some characteristics, but some characteristics are also affected by the environment (Choice D).
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