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The cell cycle

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Ok, Now let's get the details on how your cells divide, It is called Let's say we have a cell that wants to there is an order to that: in a stage called GAP 1, or just G1 phase in a stage called synthesis, abbreviated as just the "S Phase" Then the cell checks to make sure everything is duplicated, which is called the "G2 Phase". Finally, the cell divides, called the "M Phase" or "Mitosis". This is the process by which the cell makes a complete copy of its entire DNA code. so that when it divides into two cells each new cell has identical copies of the code. Remember we told you before that the beauty of those in DNAs that they allow the DNA to unzip and replicate so to replicate DNA, you unzip a segment, so you get Then the new strand is formed off the template of the old strand. This new and old strand now stay together and form one of the new copies In this system each new copy has one old strand and one new strand This method is called "Semi-Conservative Replication". Now we need to add just one more thing to this explanation of DNA replication. Earlier we said that the bases A and T are attacted to each other and that G and C are attracted to each other And this is how base-pairings and replications can occur. But there are little helper molecules that bring the complementary bases together. You can think of them as a "match making" service. When DNA replicates there are special proteins that serve to unzip the helix and actually make semi-conservative replications occur as described. The most important of these proteins is DNA polymeries. There are few different types of DNA polymeruses and each does a slightly different task. After it synthesises all of its DNA, the cell goes through another Gap phase called G2 One of the reasons for the G2 phase is to check to make sure everything is in proper order and all the neccesary parts are replicated before the final process of division. This actual division is called Mitosis It is abbreviated as M All the phases, except for M, are collectively called: So, G1, S, and G2 are together called Interphase and M is just called M The time it takes for cells to go through each of the four phases depends on the type of cell it is. One final note: Most cells don't just duplicate and divide forever. At some point they stop during one of these phases and remain in that phase the rest of their life. So to recap: We ask: And we answer: The way we grow bigger is to make more cells and cells are made in a manner Here are the steps again: Now you know that the cell goes through the cell cycle, which consists of four phases:

Video Details

Duration: 5 minutes and 31 seconds
Country: United Kingdom
Language: English
Views: 379
Posted by: lolaceituno on Sep 24, 2008

It explains how the cell duplicates

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