Search results
Results from the WOW.Com Content Network
Cellular respiration is a vital process that occurs in the cells of all living organisms. [2] [better source needed] Respiration can be either aerobic, requiring oxygen, or anaerobic; some organisms can switch between aerobic and anaerobic respiration. [3] [better source needed]
Summary of aerobic respiration. Glycolysis is the metabolic pathway that converts glucose (C 6 H 12 O 6) into pyruvate and, in most organisms, occurs in the liquid part of cells (the cytosol). The free energy released in this process is used to form the high-energy molecules adenosine triphosphate (ATP) and reduced nicotinamide adenine ...
Dissimilatory nitrate reduction to ammonium is a two step process, reducing NO 3 − to NO 2 − then NO 2 − to NH 4 +, though the reaction may begin with NO 2 − directly. [1] Each step is mediated by a different enzyme, the first step of dissimilatory nitrate reduction to ammonium is usually mediated by a periplasmic nitrate reductase.
Aerobic respiration proceeds in a series of steps, which also increases efficiency - since glucose is broken down gradually and ATP is produced as needed, less energy is wasted as heat. This strategy results in the waste products H 2 O and CO 2 being formed in different amounts at different phases of respiration.
The last steps of this process occur in mitochondria. The reduced molecules NADH and FADH 2 are generated by the Krebs cycle , glycolysis , and pyruvate processing. These molecules pass electrons to an electron transport chain , which releases the energy of oxygen to create a proton gradient across the inner mitochondrial membrane .
The process of breathing does not fill the alveoli with atmospheric air during each inhalation (about 350 ml per breath), but the inhaled air is carefully diluted and thoroughly mixed with a large volume of gas (about 2.5 liters in adult humans) known as the functional residual capacity which remains in the lungs after each exhalation, and ...
An aerobic organism or aerobe is an organism that can survive and grow in an oxygenated environment. [1] The ability to exhibit aerobic respiration may yield benefits to the aerobic organism, as aerobic respiration yields more energy than anaerobic respiration. [2] Energy production of the cell involves the synthesis of ATP by an enzyme called ...
Losses - respiration and decay: Aerobic respiration: 23,000 Microbial oxidation: 5,100 Combustion of fossil fuel (anthropogenic) 1,200 Photochemical oxidation: 600 Fixation of N 2 by lightning: 12 Fixation of N 2 by industry (anthropogenic) 10 Oxidation of volcanic gases: 5 Losses - weathering: Chemical weathering: 50 Surface reaction of O 3: ...