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If you haven’t checked out our previous videos, please check them out before you watch this. This time we’re gonna go into the last part. Anyway let’s listen first. this part. The previous summary; (1)She speaks in Akkadian with Babylonian dialect(With loan-words of Sumerian) (2)Addanika=attention,listen,heed in Akkadian (3)Dingir=god in Sumerian Sumerian language was rarely spoken

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PROFESSOR: Good morning. Come on down. All right. So last time, we talked about the first couple of steps of the central dogma. The central dogma is this name given to the statement DNA goes to DNA by replication. DNA goes to RNA by the process of transcription. We call it transcription because it’s such

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Captioning is on. To turn off, click the CC button at bottom right. Follow us on Twitter @amoebasisters and Facebook! Lately, we have been talking about DNA, and how AWESOME DNA is. But what we have not talked about is how DNA actually codes for your traits. Say, for example, we’re talking about your eye

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Hey Crazies. There this thing that mathematicians and physicists like to say: Math is the language of the universe. You’ve probably heard it so many times that you’ve just accepted it as truth. But rule #8 here at the Science Asylum is Question Everything? Is math really the language of the universe? Answering this question

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Alright. This is totally easy once you understand the physics. Watch this. Left, yep right, go back to the right. It’s easy! [unintelligible] flip. 1..2..3.. Yeah! Awesome! So, as a kid I spent many an hour in a book about the drawings of Leonardo Da Vinci. In particular his flying machines. Check out this medieval

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Përshkrimet janë në! Kliko CC në fund të djathtë për t'u fikur. Qëndroni deri tani me ne duke na ndjekur në Twitter (@AmoebaSisters) dhe Facebook! Pas të mësuarit rreth ADN-së, a keni menduar ndonjëherë,si mundet ADN-ja të rezultojë në një tipar? Le të marrim një shembull – si ngjyra e syve. Po, ADN-ja juaj ka

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嘿,这是教授戴夫,让我们来谈谈DNA转录和翻译。 现在我们明白了DNA的结构 是时候去了解这种分子怎样编码一种特定生物体。 一个包含一组特定的遗传物质的单细胞 是如何导致鱼或猫或人的生长?要理解这种 现象我们需要学习一下转录和翻译。这是 集体的过程,其中的遗传密码被酶读取,目的是 生产生物体所有的蛋白质。染色体是一个很长的分子, 由数以百万计的碱基对组成。这些碱基中的大多数没什么作用 但染色体的某些部分是特殊的。他们叫 基因。这些是为不同的东西编码的部分。在人体内的基因 平均约有10至50000碱基个对长度,但最长的有 两百五十万个碱基对长度,当基因被表达时,一个特定的 蛋白会被制造出来。 那么这是如何发生的呢?第一步是所谓的转录。这是一种 通过酶使用基因中的一条DNA链作为模板 产生信使RNA,或者叫mRNA的过程。为此,RNA聚合酶在一种称为转录因子的蛋白质的帮助下 结合于一个基因内的叫做启动子的特定序列 并且撬起分开这两条链。其中一条 链将作为模板链或者说反义链,这意味着它 将用于产生mRNA,另一条是非模板链或者叫正义链。 RNA聚合酶不需要引物,它可以简单地在起始密码子启动mRNA的合成 它在叫做延伸的过程中沿着基因向下游移动 随着它的移动合成基因 从3' 至5' 端阅读反义链,并从5' 端产生mRNA 将RNA核苷酸连接到3'末端。 这是和DNA聚合酶合成DNA非常相似的沿着模板链的移动方式 主要区别在于这里正在被 合成的是RNA,正如我们记得这将是核糖而不是脱氧核糖 它将有尿嘧啶代替胸腺嘧啶。不同于复制,RNA聚合酶在行进中解开 DNA备份,保持仅仅10 到20 个碱基同时暴露。 一旦RNA聚合酶到达该基因的末端 终止发生,酶从基因分离 DNA恢复到原来的状态。但是,我们已经生产出mRNA。 它携带着基因中编码的信息,经过几个在 RNA 加工中的 简单的修改,它将离开包含所有遗传物质或染色质的细胞核 进入细胞质中,在那里将 遇到核糖体。这是发生翻译的地方。在翻译过程中 mRNA充当着特定蛋白的编码。这是因为mRNA上的,被称之为密码子的一组三个碱基 将编码一个特定的反密码子 这将通过特定的转运RNA,或称为tRNA进行,并且每个 不同的tRNA共价连接到特定的氨基酸。 这些密码子中核苷酸的排列被称为阅读框 因为有四种碱基,每个密码子有三个字母,4 ^ 3给了我们64个不同 可能的密码子,这远超过编码所有的氨基酸的需要 这里是所有的mRNA密码子和它们编码的氨基酸的表

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good morning today we're going to walk through my solutions to the second mechanics free response question of the AP Physics C 1998 with least exam he is a registered trademark of the College Board which was not involved in the production of it is not endorsing this product here we go hey guys hey

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here you see footage of hurricanes that formed in the Atlantic Ocean during 2009 do you see that every single hurricane rotates counterclockwise all hurricanes formed in the northern hemisphere rotate counterclockwise in this video we'll provide you with the tools to explain why hurricanes rotate the way that they do this video is part

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