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第14章 货币(1 / 1)

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王哲将墙上的画面换成三个巨大的字母:A-T-P!

ATP一个既懵懂又陌生的名字。ATP的中文名是“三磷酸腺苷”,一种能量载体,在所有生命中存在。

王哲认真说:“你们手表上显示的数字只是一个单位,代表相同数量ATP所具有的电能。并不是说你们手表里真的存有ATP分子。

“世界上的能量载体有很多,但细胞学院只选用ATP作为货币单位。因为在所有生命体中,ATP是所有生命的通用货币。我们所有的生命活动都依赖于能量转化与能量消耗,所以生命必须用一种通用货币来实现这一过程。”

墙上字母变换,王哲挨个念出墙上的新单词:“GTP,NADH,FADH2。这些物质也是能量载体,但是生命活动越复杂,链式反应步骤越多,生命就越需要一种单一的货币来保证稳定的能量传递。

“这个很好理解,在欧元出现以前,欧洲不同的国家各自使用不同的货币。法国用法郎,德国用马克,奥地利用先令。一个人去往的国家越多,他需要兑换的币种就越多。

“有时候有些小币种很难兑换到,去到某些小国甚至存在一种情况——钱包里全是钱,却买不到当地商品。后来欧盟发行欧元以后,这一问题得到很大改善。到本世纪初有19个国家使用欧元。

“19个地区使用不同货币尚且存在诸多不便,我们每个人身上有37.2万亿个细胞[1]。如果没有一种通用货币,我们从嘴里吃进去的营养物质可能根本无法送到我们脚上。”

王哲看着全班十双眼睛说:“线粒体的工作机制很复杂,这个学期你们有一半的时间都要学习线粒体的养殖。

“你们会学到线粒体的构造,线粒体是如何工作的,还有人造线粒体的发电机制。

“那些都是后话,以后我会慢慢教给你们。这节课,我们要学习如何让线粒体发电。”

“发电?!”台下响起几声窃笑,“线粒体要会发电,那每个人都该是个皮卡丘。”

王哲并没有在意学生的调侃,他再抛出一个问题:“为什么我们需要线粒体?”

“进行有氧呼吸。”这次全班都能回答这个问题。

这个问题让吴穹想起他在健身房办的有氧运动健身卡,每次想起这事吴穹就觉得亏。

以前吃了文盲亏,吴穹以为有氧运动是带着氧气面罩做运动。第一次去参加有氧运动的时候教练没发氧气面罩,他还以为是教练疏漏了。后来吴穹才知道,有氧运动根本就不是他想得那个意思。

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文献[1]RoseEveleth.Thereare37.2TrillionCellsinYourBody[N],smithsonian..October24,2013

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