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The urea cycle converts highly toxic ammonia to urea for excretion. [1] This cycle was the first metabolic cycle to be discovered by Hans Krebs and Kurt Henseleit in 1932, [2] [3] [4] five years before the discovery of the TCA cycle. The urea cycle was described in more detail later on by Ratner and Cohen.
The Khan Academy website also hosts content from educational YouTube channels and organizations such as Crash Course and the Museum of Modern Art. [30] It also provides online courses for preparing for standardized tests, including the SAT, AP Chemistry, Praxis Core and MCAT [31] and released LSAT preparation lessons in 2018. [32]
After four months of experimental works to fill in the gaps, Krebs and Johnson succeeded in establishing the sequence of the chemical cycle, which they called the "citric acid cycle". [32] [33] It is also known as the "Krebs cycle" or "tricarboxylic acid (TCA) cycle". Krebs sent a short manuscript account of the discovery to Nature on 10 June ...
The citric acid cycle is facilitated by pyruvate dehydrogenase, citrate synthase, aconitase, isocitrate dehydrogenase, α-ketoglutarate dehydrogenase, succinyl-CoA synthetase, fumarase, and malate dehydrogenase. [2] The urea cycle is facilitated by carbamoyl phosphate synthetase I and ornithine transcarbamylase.
Khan Academy creates tutorials in almost all areas of science and mathematics, as well as providing official SAT preparation. The YouTube channel was founded in 2006 by Sal Khan who at the time was working as a financial analyst.
urea is not the same as uric acid, though both are end products of the purine nucleotide cycle, from ammonia and nucleotides respectively.) When the skeletal muscles are at rest (ADP<ATP), ammonia ( NH 3 ) combines with glutamate to produce glutamine , which is an energy-consuming step, and the glutamine enters the blood.
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For more information see urea cycle. Pages in category "Urea cycle" The following 21 pages are in this category, out of 21 total.