New answers tagged metabolism
Whether a reaction is reversible or irreversible, in the presence or absence of an enzyme, is not related to activation energy. An enzyme lowers activation energy in both directions. A reaction is reversible or irreversible depending on the conditions in which this reaction occurs. If there's a sustained high concentration of substrates, most of the ...
I suspect that what you are actually looking for is the following: - 1 gram of fat = 9 kcal - 1 gram of protein = 4 kcal - 1 gram of sugar = 4 kcal - 1 gram of alcohol = 7 kcal Those are general and inexact values. They're just often used to give a rough idea of the amount of energy we get from different types of food.
In a coupled reaction energy required by 1 process is supplied by another process. For example: glucose + phosphate becomes glucose.6.phosphate. This is an endergonic reaction and the energy is supplied to this reaction by another reaction which has to be exergonic reaction i.e. ATP which can become ADP+energy.
Oxidation does not mean inflammation. But oxidation can be a cause of inflammation. Oxidation processes are part of normal cell metabolism (mostly in mithocondria). They lead to reactive oxygen species ($O_2^-$, $H_2O_2$ and $OH-$) which can trigger inflammation via activation of some transcription factors: NF-κB, AP-1, p53, HIF-1α, PPAR-γ, ...
Veritasium created an excellent video just on this topic, which I would recommend watching, but will summarize here. A common misconception is that we loose weight when we digest food or burn calories. Keep in mind that that broken down food and those calories* aren't "going anywhere", so technically you shouldn't loose any mass (unless you get rid of the ...
There is an explanation video on the Veritasium YouTube channel https://www.youtube.com/watch?v=lL2e0rWvjKI (not a direct answer through)
There is only one way to gain weight, consume things. Thus after any period of time not consuming anything (i.e. sleeping) we must necessarily weigh <= what we weighted at the start of that time period. Add in respiration, and that becomes a strict inequality!
There is indeed a slight weight variation during the day. About 2 - 4 lbs (approx. 1 - 2 kg) [1, 2]. Some causes are: water loss through respiration, perspiration or urination . the relative long period without eating and drinking . metabolic processing of food and drinks during sleep. References: Cindy Banyai. ...
This question got me thinking about what are the metabolic enzymes that take oxygen up in E coli. I searched the metacyc database for reactions that consume molecular oxygen and there are only 3 that take in oxygen and one that produces oxygen. All three consumers of oxygen in E coli are the oxidation of ubiquinone by at two sites in cytochrome bcl or by ...
The plasma membrane is quite permeable to oxygen and thus oxygen enters the cell simply by diffusion. Reactive oxygen species can be reduced enzymatically in aerobic organisms. Obligate anaerobes lack or don't produce sufficient quantities of these enzymes. An organism that doesn't use oxygen for metabolism but is also not relatively harmed by it can be ...
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