Carbohydrates are one of the 3 macronutrients, along with fats Fats The glyceryl esters of a fatty acid, or of a mixture of fatty acids. They are generally odorless, colorless, and tasteless if pure, but they may be flavored according to origin. Fats are insoluble in water, soluble in most organic solvents. They occur in animal and vegetable tissue and are generally obtained by boiling or by extraction under pressure. They are important in the diet (dietary fats) as a source of energy. Energy Homeostasis and proteins Proteins Linear polypeptides that are synthesized on ribosomes and may be further modified, crosslinked, cleaved, or assembled into complex proteins with several subunits. The specific sequence of amino acids determines the shape the polypeptide will take, during protein folding, and the function of the protein. Energy Homeostasis, serving as a source of energy to the body. These biomolecules store energy in the form of glycogen and starch, and play a role in defining the cellular structure (e.g., cellulose). Carbohydrates can be broadly classified into simple and complex carbohydrates based on the number of sugar units and chemical bonds. Carbohydrates are the most abundant organic molecules in nature and are the structural basis of many organisms. These biomolecules have a carbon:water ratio of 1:1 and a general molecular formula that can be represented as Cn(H2O)n.
Last updated: Jul 7, 2022
Carbohydrates are composed of carbon, hydrogen, and oxygen; they are defined as aldehydes or ketones of polyalcohols and have a general molecular formula of Cn(H2O)n. Carbohydrates are named based on the number of polymers (number of units) present in the molecule:
Carbohydrates are classified into simple and complex carbohydrates based on their polymerization.
|Type of carbohydrate||Examples|
Compounds having the same structural formula but differing in spatial configuration are called stereoisomers:
Enantiomers: refers to two stereoisomers that are mirror images of one another
Diastereoisomers are nonsuperimposable stereoisomers that are not mirror images of each other.
Epimers are compounds that differ from each other only in configuration with regard to a single carbon atom, other than the reference carbon atom. Glucose Glucose A primary source of energy for living organisms. It is naturally occurring and is found in fruits and other parts of plants in its free state. It is used therapeutically in fluid and nutrient replacement. Lactose Intolerance and galactose Galactose An aldohexose that occurs naturally in the d-form in lactose, cerebrosides, gangliosides, and mucoproteins. Deficiency of galactosyl-1-phosphate uridyltransferase causes an error in galactose metabolism called galactosemia, resulting in elevations of galactose in the blood. Lactose Intolerance are epimers.
Anomerism refers to different spatial configurations around the anomeric carbons.
Optical activity is the ability of stereoisomers to rotate plane-polarized light. The molecules are designated dextrorotatory (+) or levorotatory (-) depending on the direction of light rotation Rotation Motion of an object in which either one or more points on a line are fixed. It is also the motion of a particle about a fixed point. X-rays.
Oxidation and reduction reactions:
Carbohydrates play many roles in the sustenance of life. Primarily, carbohydrates serve as a source of nutrition. Additionally, they are structural components of cells, and partake in immune defense and intracellular communication Communication The exchange or transmission of ideas, attitudes, or beliefs between individuals or groups. Decision-making Capacity and Legal Competence.
Carbohydrates are central to many metabolic pathways in the body, which include the formation, breakdown, and interconversion of carbohydrates.
Key metabolic pathways:
Several conditions are associated with disorders in carbohydrate metabolism:
Sign up now and get free access to Lecturio with concept pages, medical videos, and questions for your medical education.
Lecturio Premium gives you full access to all content & features
Verify your email now to get a free trial.
Lecturio Premium gives you full access to all contents and features—including Lecturio’s Qbank with up-to-date board-style questions.