| 单词 | Krebs cycle |
| 例句 | Rerun the tape of evolution, and DNA, RNA, ATP, the Krebs cycle — the rigmarole of Biology 101 — would probably arise again, here or in distant worlds. Why We Should Never Expect to Discover Sentient Ice Cubes 2018-08-13T04:00:00Z “Asking students questions like, ‘Tell me in three sentences what is the Krebs cycle in chemistry?’ Paper exams, chatbot bans: Colleges seek to ‘ChatGPT-proof’ assignments 2023-08-09T04:00:00Z Plants already make sugars through photosynthesis and circulate them throughout their tissues to be metabolized in the Krebs cycle. Crops grown without sunlight could help feed astronauts bound for Mars 2023-06-07T04:00:00Z Explain the advantage that the higher energy efficiency per kg of the Krebs cycle provides to you compared to a metabolism based on glycolysis alone. Biology for AP Courses 2022-06-09T00:00:00Z The Krebs cycle is the second stage of cellular respiration. Miller & Levine Biology 2018-01-01T00:00:00Z Acetyl CoA enters the Krebs cycle by combining with a four-carbon molecule, oxaloacetate, to form the six-carbon molecule citrate, or citric acid, at the same time releasing the coenzyme A molecule. Anatomy and Physiology 2013-06-19T00:00:00Z The application includes nearly 200 templates for everything from blood vessels to the Krebs cycle. Daily briefing: How a ‘super-smeller’ can sniff out Parkinson’s disease 2019-03-19T04:00:00Z The acetate, it turns out, was processed through a metabolic cycle known as the Krebs cycle. Crops grown without sunlight could help feed astronauts bound for Mars 2023-06-07T04:00:00Z It was a welcome change to find my eyes glued not to the endlessly frustrating loop of the Krebs cycle, but instead to a portrait of 19th-century aristocrats in top hats and ball gowns. What Doctors Can Learn From Looking at Art 2016-12-22T05:00:00Z At the beginning of the Krebs cycle, the three-carbon compound known as pyruvic acid created from glycolysis passes through the two membrane walls of the mitochondrion. Miller & Levine Biology 2018-01-01T00:00:00Z In addition, the Krebs cycle supplies the starting materials to process and break down proteins and fats. Anatomy and Physiology 2013-06-19T00:00:00Z “I never thought, until about two months ago, I’d ever have to learn the Krebs cycle,” he said, referring to the reactions, familiar to most high-school biology students, by which a cell powers itself. An Old Idea, Revived: Starve Cancer to Death 2016-05-12T04:00:00Z And with each full turn of the Krebs cycle, plants release two molecules of CO2, leaving no carbon atoms for the plant to build leaves, roots, or stems. Crops grown without sunlight could help feed astronauts bound for Mars 2023-06-07T04:00:00Z The specific enzymes and substrates of glycolysis and the Krebs cycle are now assessed, rather than solely their net yields, as was the case in the past. 4 Tips to Prepare for the MCAT's New Natural Sciences Questions 2014-12-02T05:00:00Z As the Krebs cycle unfolds, this acetyl CoA transfers the two carbon atoms to a four-carbon molecule that is already present in the cycle. Miller & Levine Biology 2018-01-01T00:00:00Z Figure 24.9 Carbohydrate Metabolism Carbohydrate metabolism involves glycolysis, the Krebs cycle, and the electron transport chain. Anatomy and Physiology 2013-06-19T00:00:00Z The next day, they memorize the steps in the Krebs cycle. What Doctors Can Learn From Business Leaders 2013-08-01T17:01:00Z The glyoxylate cycle bypasses steps in the Krebs cycle where carbon is lost as CO2, so it should conserve carbon that could be used for growth. Crops grown without sunlight could help feed astronauts bound for Mars 2023-06-07T04:00:00Z Ley's new study also found a strong link with leukaemia and two enzymes, IDH1 and IDH2, which are essential to the Krebs cycle through which cells produce the energy they need to survive. Epigenetics: Reversible tags 2013-06-26T17:20:55.210Z The electron transport chain uses the high-energy electrons from glycolysis and the Krebs cycle to synthesize ATP from ADP. Miller & Levine Biology 2018-01-01T00:00:00Z In both cases, fat stores are liberated to generate energy through the Krebs cycle and will generate ketone bodies when too much acetyl CoA accumulates. Anatomy and Physiology 2013-06-19T00:00:00Z Second, an analysis of the by-products of the Krebs cycle in the mice’s urine suggested that several of the enzymes which regulate this cycle were being inhibited in the kwashiorkor-transplant mice. Malnutrition and the microbiome: Debugging the problem 2013-01-31T16:02:48Z In times of starvation, amino acids can be used as an energy source and processed through the Krebs cycle. Anatomy and Physiology 2013-06-19T00:00:00Z When excess acetyl CoA is produced that cannot be processed through the Krebs cycle, the acetyl CoA is converted into triglycerides and fatty acids to be stored in the liver and adipose tissue. Anatomy and Physiology 2013-06-19T00:00:00Z The Krebs cycle and the electron transport chain are both aerobic processes. Miller & Levine Biology 2018-01-01T00:00:00Z Figure 24.15 Ketone Oxidation When glucose is limited, ketone bodies can be oxidized to produce acetyl CoA to be used in the Krebs cycle to generate energy. Anatomy and Physiology 2013-06-19T00:00:00Z The Krebs cycle transfers the energy in sugar to a molecule called ATP, which is the body’s energy currency. Malnutrition and the microbiome: Debugging the problem 2013-01-31T16:02:48Z Figure 24.4 Cellular Respiration Cellular respiration oxidizes glucose molecules through glycolysis, the Krebs cycle, and oxidative phosphorylation to produce ATP. Anatomy and Physiology 2013-06-19T00:00:00Z Under aerobic conditions, pyruvate enters the Krebs cycle, also called the citric acid cycle or tricarboxylic acid cycle. Anatomy and Physiology 2013-06-19T00:00:00Z In the next stage, the Krebs cycle, pyruvic acid that was produced during glycolysis is broken down, and energy carriers are produced. Miller & Levine Biology 2018-01-01T00:00:00Z As previously explained, fatty acids can be converted into acetyl CoA and processed through the Krebs cycle to make ATP. Anatomy and Physiology 2013-06-19T00:00:00Z If excess acetyl CoA is created and overloads the capacity of the Krebs cycle, the acetyl CoA can be used to synthesize ketone bodies. Anatomy and Physiology 2013-06-19T00:00:00Z This transamination event creates a molecule that is necessary for the Krebs cycle and an ammonium ion that enters into the urea cycle to be eliminated. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 24.19 Energy from Amino Acids Amino acids can be broken down into precursors for glycolysis or the Krebs cycle. Anatomy and Physiology 2013-06-19T00:00:00Z In contrast, the Krebs cycle and electron transport chain, which generate the majority of ATP during cellular respiration, take place inside the mitochondria. Miller & Levine Biology 2018-01-01T00:00:00Z Pyruvate, lactate, and alanine from muscle cells are not converted into acetyl CoA and used in the Krebs cycle, but are exported to the liver to be used in the synthesis of glucose. Anatomy and Physiology 2013-06-19T00:00:00Z |
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