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《遗传变异》一章是高中生物教学中的重点,而“遗传的物质基础”则是重点中的重点和难点。但教材中一些模糊的说法却会使学生乃至教师产生错误的理解。例如,前不久笔者从不同的练习册上看到两条相似的题目: 1、组成人噬菌体烟草花叶病毒中核酸的核苷酸分别有多少种? A、8,4,4 B、4,4,4 C、5,4,4 D、8,4,5 2、组成人噬菌体烟草花叶病毒中遗传物质的核苷酸分别有多少种? 供选答案相同。一些同学和老师认为这两条题目都应选A,因为教材(最
The chapter “Genetic Variants” is the focus of high school biology teaching, and the “genetic material basis” is the focus of the key and difficult. However, some obscure statements in the textbook will make students and teachers have a wrong understanding. For example, not long ago I saw two similar topics from different exercise books: 1. How many nucleotides do the nucleic acids in the adult phage tobacco mosaic virus have? A, 8, 4, 4 B, 4, 4,4 C, 5,4,4 D, 8,4,5 2 What is the nucleotide number of the genetic material of the human phage Tobacco mosaic virus? Some students and teachers think that these two topics should be selected A, because teaching materials (most