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When a cell replicates itself, where does it get the matter to do so? I mean, cells can't just makes copies out of nothing, right?
Cell replication just means that the cell divides in two cells, so the new cells are both half the size of the original cell. After the division the new cells may grow using matter in their surroundings. When grown enough they themselves may divide.lifeisareaction said:When a cell replicates itself, where does it get the matter to do so? I mean, cells can't just makes copies out of nothing, right?
This is absolutely not true. The energy from the ATP bond is not converted into any mass, it is used to power other reactions.Rade said:To: lifeisareaction
The "matter" for cell replication comes from the "energy" in the bonds of the resting ATP molecule. When the cell needs energy to replicate, one P goes into solution and is lost from ATP and in the process ADP is formed + "energy". Now, from E = Mc^2 we know that there is an equivalence of mass and energy. Thus, this bond energy that is released has all of properties of mass.
So, to answer your question, you are correct that the cell does not start the process of making copies of itself "out of nothing". It starts the process by using energy that was already present in the resting ATP molecule. Thus, when the replication process is completed, there is no gain or loss of either energy or mass, they have just changed form. Recall from physics, energy (nor mass) can neither be created nor destroyed--only change forms.
I did not say the "energy of the bond is converted into mass", I said that the energy of the bond "has all the properties of mass". The bond energy of resting ATP begins as energy, and when ADP + P are formed, it ends as energy. However, because E = Mc^2, the bond energy also begins as mass and ends as mass as well. Energy and mass are equivalent, and in an ultimate sense they are identicle and are co-present always, two aspects of the same thing.Monique said:This is absolutely not true. The energy from the ATP bond is not converted into any mass, it is used to power other reactions.
This is just bunk. The factor c-squared in the Einstein formula means it takes astronomical amounts of energy to equate to a typical cell mass. The mass equivalent of the ATP energy would be way way after the decimal point in proportion to the cell mass. When a cell divides the daughter cells are smaller. To a very high approximation mass is conserved apart from energy.Rade said:I did not say the "energy of the bond is converted into mass", I said that the energy of the bond "has all the properties of mass". The bond energy of resting ATP begins as energy, and when ADP + P are formed, it ends as energy. However, because E = Mc^2, the bond energy also begins as mass and ends as mass as well. Energy and mass are equivalent, and in an ultimate sense they are identicle and are co-present always, two aspects of the same thing.
The initial question was;
When a cell replicates itself, where does it get the matter to do so?
The "matter" (thus "energy") is in the resting ATP molecule. Another form of the question could have been: ...where does it get the energy to do so....
Ultimately they are the SAME QUESTION, and the SAME ANSWER--from ATP.
The question was not where does the "energy" come from, it was where does the "matter" come from. Gerben has appropriately answered the question by recognizing that this word choice indicates the OP was confusing cell division with cell growth.RadeThe initial question was; [COLOR=RoyalBlue said:When a cell replicates itself, where does it get the matter to do so? [/COLOR]
The "matter" (thus "energy") is in the resting ATP molecule. Another form of the question could have been: ...where does it get the energy to do so....
Ultimately they are the SAME QUESTION, and the SAME ANSWER--from ATP.
No, that's still not correct. The replication that goes on before cell division, such as duplication of chromosomes and organelles, requires more than just ATP. The bond energy released when ATP is converted to ADP is not enough to create new matter! The matter already exists in the form of nutrients absorbed by the cell from the environment. Even photosynthetic organisms need to extract nutrients and water from soil.Rade said:You are right lifeisareaction, cells do not make copies out of nothing, they make copies out of the energy found in the ATP molecule. I will be more careful in my wording in the future.
No need for apologies (acknowledging a mistake doesn't mean anyone needs to apologize for it; honest misunderstandings happen, and it doesn't mean you did anything wrong that requires an apology). People with different backgrounds will latch onto different parts of a question, and it is through the discussion that the question becomes clarified.Rade said:I owe this thread an apology, because it is important for young people to understand that when mistakes are made, mistakes should be acknowledged. I most apologize to poor "Lifeisareaction", hopefully not already driven away from science to business major for lack of clear response to what they titled "Basic Question".
Sometimes what seems like a simple question can be open to different interpretation. My interpretation about what was asked about "making copies out of nothing" during replication of chromosomes was clearly incorrect, as discussed above by Moonbear, selfAdjoint, Monique.![]()