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据不完全统计,新编高中生物必修本有70余处关于“主要”的叙述。为帮助同学们正确理解这些“主要”问题,从而加深对课本知识的理解,培养分析问题和解决问题的能力,现将部分“主要”问题浅析于下: 1、原生质的主要成分是蛋白质和核酸。原生质的化学组成除蛋白质、核酸外,还有水、脂类、糖类、其他有机物和无机物。为什么说原生质的主要成分是蛋白质和核酸呢?可作如下理解:在组成原生质的各种化合物中,虽然水是含量最多的物质,是生命活动的最重要的介质,地球表面出现了液态水时,才具备了生命发生的条件。但是只有当原始地球出现了原始的新陈代谢
According to incomplete statistics, the newly edited high school biology book has more than 70 narratives about “main”. In order to help students understand these “major” problems correctly, so as to deepen the understanding of textbook knowledge and cultivate the ability to analyze problems and solve problems, we now analyze some of the “major” problems as follows: 1. The main component of protoplasm is protein and Nucleic acid. The chemical composition of the protoplasm, in addition to proteins and nucleic acids, includes water, lipids, sugars, other organics, and inorganic substances. Why do you say that the main components of protoplasm are proteins and nucleic acids? It can be understood as follows: Among the various compounds that make up protoplasm, although water is the most abundant substance, it is the most important medium for life activities, and when liquid water appears on the surface of the earth Only with the conditions of life happen. But only when the original planet appeared the original metabolism