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Physical and chemical structure of carbohydrates
Carbohydrates A-level Biology
An introduction to carbohydrates chapter 5
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Eighteen percent of our body weight is made up of carbon. Carbon atoms make up important molecules in our bodies such as proteins, DNA, RNA, sugars, and fats. These molecules are called macromolecules. Carbon bonding to itself results in a wide variety of organic compounds, which means that organic compounds are carbon-based carbons. Most matter in living organisms that is not water is made of organic compounds. Nearly everything that is touched is organic. Four main classes of organic compounds that are needed for life are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates are the most abundant biomolecule on Earth. “Carbohydrates are used as accessible energy to fuel cellular reactions and for structural support inside cell …show more content…
A dehydration synthesis reaction forms a bond between carbon atoms in two monosaccharides, sandwiching an oxygen atom between them and releasing a water molecule.” (https://dlc.dcccd.edu/biology1-3/carbohydrates). Carbohydrates are composed of carbon, hydrogen, and oxygen in a ratio of one carbon atom to two hydrogen atoms to one oxygen atom. Carbohydrates exist as monosaccharides, disaccharides, and polysaccharides. A monosaccharide is a monomer of a carbohydrate. A monosaccharide is a single sugar that contains carbon, hydrogen, and oxygen. When two monosaccharides join, they form a double sugar called a disaccharide. “This image shows disaccharides joined by a glycosidic bond. A glycosidic bond to the anomeric carbon can be either a or B. For example maltose, is the disaccharide gained by enzyme-catalyzed hydrolysis of starch, consists of two D-glucopyranose units joined by a 1,4’-a-glycoside bond. The “prime” indicates that C-4 is not the same ring as C-1. Unlike the other disaccharides, sucrose is not a reducing sugar and does not exhibit mutarotation because the glycosidic …show more content…
Triglycerides contain three fatty acids and one molecule of glycerol. Saturated triglycerides are made up of saturated fatty acids. This means that they have high melting points and are hard at room temperature. This is because the molecules of a saturated fat are packed closely together. Examples of saturated triglycerides would be butter and fats in red meat. Unsaturated triglycerides are made up of unsaturated fatty acids, which means they are soft or liquid at room temperature. An example of an unsaturated fat would be olive oil because the molecules cannot pack together closely enough to solidify because of the kinks in some of their fatty acid hydrocarbon chains. A “kink” occurs in a double-bond of the fatty acid tail. “A double-bond occurs in an unsaturated fat has at least one carbon-carbon double or triple bond. A saturated fat on the other hand, only consists of carbon-carbon single bonds.” “Libretexts. "Lipids and Membranes." Biology LibreTexts. Libretexts, 20 Nov. 2013. Web. 16 Sept. 2017.” This image illustrates butter as a saturated fat and olive oil as a unsaturated fat. The fatty acid of the saturated fat has a space-filling model of stearic acid. The red represents the oxygen, black represents carbon, and the gray represents the hydrogen. The fatty acid of the unsaturated fat has a space-filling model of oleic acid. The cis double bond causes bending. (Cis means “on this side.” “In geometrical isomer nomenclature, the prefix
Carbohydrates are biomolecules that consist of a chain or ring of carbon atoms attached to hydrogen and oxygen atoms. The simplest formula for carbohydrates is (CH2O)n. Carbohydrates are important to organisms for a variety of reasons. They are used to form the structural components of the cell, aid in energy storage, and serve as intermediary compounds for more complex molecules. Carbohydrates are classified as either monosaccharides, disaccharides, or polysaccharides. Both monosaccharides and disaccharides dissolve easily in water. Carbohydrates are produced in plants through the process of photosynthesis and animals obtain these carbohydrates by eating the plants. ("BIO 1510 Laboratory Manual," 2016)
All monosaccharides are reducing sugars because they all aldehydes. Different monosaccharides contain different number of carbon atoms. There are three types of monosaccharides, trioses, pentose and hexose. They generally contain three (trioses), five (pentoses) or six (hexoses) carbon atoms. Triose is used as a product in biochemical pathways of respiration and photosynthesis.
Generally the most feared and hated macro nutrient is the carbohydrate. It is technically not the most fattening nutrient, (Carbohydrates provide 4 calories per gram whereas actual fat provides 9.) yet carbohydrates are much more numerous in the foods that contain them. For instance, white bread or ice cream contain multitudes of carbohydrates since they are simple sugars, but don't contain nearly the same amounts of fat. Carbohydrates at the basic level are made from carbon, hydrogen, and oxygen. It is these three elements that make up the sim...
Monosaccharides (simple sugars) are the monomers of carbohydrates. These cannot be
Fats are separated in to two groups, saturated and unsaturated fats. Unsaturated fats have doubled bonds, meaning that where a hydrogen atom would be the there is none so the carbon atoms bond together instead “the carbon atoms are busy double-bonding with each other, then they aren't forming bonds to hydrogen atoms” "The Kinds of Fat and Why It Matter to You." Indiana University. Web. Saturated fats are saturated with Hydrogen Atoms.
Fats contain 3 fatty acids, each of which are connected to a single glycerol molecule through an ester linkage (a bond between carboxyl and hydroxyl). The resulting fat is triacylglycerol sometimes called triglyceride.
Triglycerides, that are derived from fatty acids, make up its chemical composition. Fatty acids are molecules that have a carbon atom that is double bonded to an oxygen atom. Triglycerides are composed of three fatty acids, also known as carboxyl acids, that are chemically bound to a glycerol (Douma 2017). The triglycerides in butter can be composed of different fatty acids like oleic acid, searic acid, and palmitic acid (Reyes 2013). To make butter, milk or cream is
Polysaccharides are carbohydrates, their main function is to give us energy. They are polymers of monosaccharides made up of carbon, hydrogen, and oxygen. Starch is one form of a polysaccharide, it consists entirely of α- glucose molecules linked in long chains. Plants store glucose in the polysaccharide
Carbohydrates are the most numerous classes of bio-organic compounds in the biological sphere. The element forms a great percentage of the earth’s biomass, from tiny cells components to the food consumed for metabolic energy. Better understanding of carbohydrate molecules and their formations is of significance. In organic chemistry, monosaccharide’s is the simplest unit of carbohydrates represented in the Fischer projection, Haworth and the chair conformation of D-glucose. Lipids, on the other hand, are molecules made of hydrocarbons that formulate the building units of the structure and performance of living cells. Fats can be divided into two categories namely, soluble and non-soluble lipids. Examples of lipids include oils, fats, some vitamins, hormones, waxes and most proteins. The manuscript within is a
Unsaturation fatty acid chains with one double bond present is a monounsaturated fatty acid, but if it contains two or more double bonds in the carbon chain of a fatty acid it is a polyunsaturated. In the chain, the two carbon atoms, which are bound next to each side of the double bond, can occur in a cis or trans configuration (figure 2). Saturated fat tends to raise blood cholesterol levels. Unlike saturated fats, most unsaturated fats are good and tends to lower LDL cholesterol. However, the trans-fat is an exception of that because it is generally considered to be bad for the person's health. The temperature when the molecule melts affected by The degree of unsaturation of the fatty acids in a fat. Mostly, the more saturated a fat, the more solid and firmer its consistency, so largely saturated animal fats are solid. In contrast, it remains more liquid at room temperature if it more unsaturated a fat. Therefore, vegetable oils that containing monounsaturated or polyunsaturated fatty acids
The omega-3 fatty acids, popularly referred to as fish oil, are considered unsaturated fats. Science differentiates between unsaturated and saturated fats quite clearly. One fact that separates the two is the temperature at which melting occurs. Saturated fats melt at a higher temperature than unsaturated fats. The science behind fatty acids is rather complex; carboxylic acids with long hydrocarbon chains are the building blocks of saturated and unsaturated fats. This is important to the human body for many reasons; one reason being unsaturated fats do not cause plaque build-up in arteries like saturated fats due to their molecular structure in the human blood stream.
The bad fats are trans fatty acids. Trans fatty acids are created and are saturated fats meaning they have no carbon double bonds. Diets high in saturated fats increase the risk of heart disease. Foods to avoid would are beef, butter, and lard. The good fats are unsaturated fats. These are commonly called monosaturated fats, and polysaturated fats. Diets high in unsaturated fats are, “associated with a lower risk of heart disease” (p.137) Monosaturated fats can been found in avocados, olive and canola oil. Polysaturated fats such as linoleic and alpha-linolenic acid are essential fatty acids because the body is not able to produce them, as described, “they are needed for the formation of the phosopholipid that give cell membranes their structure and functional properties.”(p.138) Cholesterol is needed to, “synthesize other sterols, including vitamin d; bile acids, which are emulsifiers in bile; cortisol, which is a hormone that regulates our physiological response to stress; and testosterone and estrogen, which are hormones necessary reproduction.” (p.140) I am pleased to mention that I met all the requirements for fatty acids and
Multiple organic compounds exist in all life on Earth, (e.g., amino acids, nucleobases, lipids) and are used as biomarkers for the characteristics of extinct or extant life.
Glucose is the simplest and most common monosaccharide. It is a Hexose sugar and therefore has the formula C6H12O6. Glucose can exist in two possible ring forms, known as the alpha (a) and beta (b) forms: [IMAGE] The hydroxyl group on Carbon atom 1 can project below the ring (a glucose) or above the ring (b glucose). Molecules like this, which have the same molecular formula but a different structural formula, are said to be ISOMERS of each other.
Organic chemistry is the study of carbon and its compounds (Alcin). Carbon is less than one percent of all matter.Carbon is part of every living thing (Gangson). Carbon makes up eighteen percent of all the matter in living things. (Alcin). The average human body has about 16 kilograms of carbon in some form of this element. Carbon is a part of DNA and proteins. (Robertson).