GMAT阅读是GMAT考试中相对较难的一个单项，主要是因为GMAT阅读涉及到不同的文章类型和题目类型，结论说明类就是其中一种。本文为大家带来的是GMAT阅读结论说明套路OG12真题解析，希望对大家的阅读备考有帮助。
结论说明套路的文章会在文章开头抛出一个明确的结论，一般在首句都会出现topic sentence。然后在下文中围绕这一结论进行详细论述，并且在讨论的过程中不断抛出论据通过摆事实和分析论据来证明结论的正确性或可行性。这类文章可以通过对论据的分析很准确的判断作者的态度，对接下来的题目练习做好铺垫。考生在平时练习的时候一定要养成分析文章套路的习惯，文章的展开通常会以“总-分”的形式来呈现。下面小编将结合OG12中的文章为大家详细介绍一下：
All the cells in a particular plant start out with the same complement of genes. How then can these cells differentiate and form structures as different as roots, stems, leaves, and fruits? The answer is that only a small subset of the genes in a particular kind of cell are expressed, or turned on, at a given time. This is accomplished by a complex system of chemical messengers that in plants include hormones and other regulatory molecules. Five major hormones have been identified: auxin, abscisic acid, cytokinin, ethylene, and gibberellin. Studies of plants have now identified a new class of regulatory molecules called oligosaccharins. Unlike the oligosaccharins, the five well-known plant hormones are pleiotropic rather than specific; that is, each has more than one effect on the growth and development of plants. The five have so many simultaneous effects that they are not very useful in artificially controlling the growth of crops. Auxin, for instance, stimulates the rate of cell elongation, causes shoots to grow up and roots to grow down, and inhibits the growth of lateral shoots. Auxin also causes the plant to develop a vascular system, to form lateral roots, and to produce ethylene.
The pleiotropic of the five well-studied plant hormones is somewhat analogous to that of certain hormones in animals. For example, hormones from the hypothalamus in the brain stimulate the anterior lobe of the pituitary gland to synthesize and release many different hormones, one of which stimulates the release of hormones from the adrenal cortex. These hormones have specific effects on target organs all over the body. One hormone stimulates the thyroid gland, for example, another the ovarian follicle cells, and so forth. In other words, there is a hierarchy of hormones. Such a hierarchy may also exist in plants. Oligo¬saccharins are fragments of the cell wall released by enzymes: different enzymes release different oligosaccharins. There are indications that pleiotropic plant hormones may actually function by activating the enzymes that release these other, more specific chemical messengers from the cell wall.更多相关内容请点击》GMAT阅读取非题OG13真题解析。
1. 确定文章类型：
结论说明型---生物，结论---说明----解释。
2. 确定主题：植物中的五个H和一个O的作用介绍。
3. 理清逻辑结构：
为什么相同基因的植物细胞能表现不同?是因为一个包含H和其他的复杂系统达到的。重点介绍五中H和一个OLI。
五种H每个都有多种作用，以A为例。植物中的H和动物中的很像：动物来自hy的H刺激AL以释放很多种拥有具体作用的H。而在植物中，H激活E并让E释放OLI，不同的E释放不同的OLI，而OLI是具有集体作用的。
以上是关于GMAT阅读结论说明套路OG12真题解析的详细内容，希望大家也能从中受益，不断改进自己的备考方法提升备考效率，从而写出漂亮的文章获得满意的成绩。更多相关内容百利天下小编会持续为大家送上，祝大家都能早日梦圆名校。
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