<span>When someone is vitamin B12 deficient, one of the reasons could be that the person’s digestive system (intestine) is not absorbing the vitamin efficiently.
Vitamin B12, also called cobalamin, is a water-soluble vitamin that is essential for the normal functioning of the brain (it participates in the synthesis of neurotransmitters), the nervous system (it is essential for maintaining the integrity of the nervous system and especially the sheath myelin that protects the nerves and optimizes their functioning) and the formation of blood (helps with the division of erythroblasts). It is one of the eight B vitamins. It is normally involved as a cofactor in the metabolism of each of the cells of the human body.
Dietary vitamin B12 is absorbed through a multi-step process. In the acidic environment of the stomach, it is separated from the food substrate of animal origin by gastric pepsins. It then binds to salivary R proteins from which it is released in the duodenum under the effect of pancreatic proteases. It can then associate with the intrinsic factor, a binding glycoprotein secreted by the parietal cells of the stomach. Vitamin B12-intrinsic factor complex travels throughout the small intestine before being absorbed in this form into the ileum via the cubam receptor.
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Answer:
In Glycolysis, the glucose molecule undergoes several chemical processes. At the end, it gets converted into two molecules of pyruvate.
Jellyfish and corals are example of radially symmetrical. When you say radial symmetric, it's a kind of animal that has a surface that have a mouth in the center that can reach out in any direction to be able to catch and eat their foods.
Answer:
Urey and miller cooked a "primordial soup" with Hadean gases, water and electricity to make <u>glucose</u>, <u>acetic acid</u>, <u>amino acids</u> and <u>lipids</u>.
Explanation:
In the Miller-Urey experiment, the aim was to reproduce the conditions of the earth before the existence of life, with the objective of demonstrating the formation of organic matter from inorganic molecules.
The scientists took water and gases present in the Hadean eon —previous to the existence of life— such as methane, carbon dioxide, hydrogen, nitrogen and even ammonia, the primordial soup. This mixture was subjected to electrical discharges, inside closed containers.
The results were some organic molecules, including glucose, acetic acid, amino acids and fatty acids. In these results the presence of macromolecules, such as proteins or nucleic acids, is not appreciated, however it was a significant contribution to the knowledge of the origin of life on earth.
Answer:
I<em> think</em> it's only one allele is required to express the trait.
Explanation: