Structure and function of lipids essay writing

  • 08.06.2019

There is recent evidence that lipids are also important as signaling molecules within the body, sometimes serving as a marker for programmed cell death. Essay 2. A current designation is based on the position of the end most double bond, counting from the methyl CH3 carbon, called the omega end.

The most important omega fatty acids are: Omega 6 — linolein and arachidonic acids and Omega 3 — linolenic, icosapentaenoic, and docosahexaenoic acids. They are the esters of three molecules of fatty acids plus one molecule of glycerol; the fatty acid may be all different. As they include three fatty acids, fats and oils are also known as triglycerides. They are found in adipose tissue, butterfat, lard, suet, fish oils, olive oil, corn oil, etc. Some fats are saturated, while others are unsaturated.

These terms refer to the presence or absence of double bonds in the fatty acids of fats. Saturated fats have no double bonds, whereas unsaturated fats contain one or more such bonds.

In general, plant fats are unsaturated and animal fats are saturated. Saturated fats are generally solid at room temperature, while unsaturated fats are typically liquid. Like all fats, the hydrocarbon tails of phospholipids do not dissolve in water.

However, phosphate groups are polar and soluble in water. The different solubilities of the two ends of phospholipid molecules allow them to form the bilayers that make up the cell membrane Fig. This lipoprotein coating is called myelin sheath. On digestive tract they facilitate the digestive process depressing gastric secretion, slowing gastric emptying and stimulating biliary and pancreatic flow. Bile salts by-products of cholesterol are natural detergents synthesized in the liver and secreted into bile.

They solubilize phospholipids and cholesterol in the bile, permitting the secretion of cholesterol into the intestine the excretion of both cholesterol and bile salts is the major way by which cholesterol is removed from the body. Bile salts also aid in the digestion and absorption of fat and soluble-fat vitamins in gut.

In many animals, some lipids are secreted into external environment and act as pheromones that attract or repel other organisms. They affect the texture and flavor of food and so its palatability.

Food manufacturers use fat for its textural properties, e. The mixture molecules show combined characteristics and perform special functions. E ssay 4. Classification s of Lipids: Based on chemical composition lipids are classified as follows: 1.

Simple lipids or Homolipids: These are esters of fatty acids with various alcohols. A fat is solid at ordinary room temperature whereas oil is liquid. Compound lipids or Heteroliplds: These are esters of fatty acids with alcohol and having additional group s.

Derived lipids: These are the substances derived from simple and compound lipids by hydrolysis. These include fatty acids, alcohols, mono- and diglycerides, steroids, terpenes and carotenoids. They are the major components of storage or depot fats in plant and animal cells but are not normally found in membranes.

Most fats and oils, upon hydrolysis, yield several fatty acids as well as glycerol. Their generic formula is shown in the following figure: Obviously, when the groups attached to carbon 1 and 3 differ, a centre of asymmetry is created at C A fat molecule contains 3 moles of fatty acids, which may be similar or dissimilar.

Most of the triglycerides in nature are mixed or asymmetrical triglycerides, i. Most animal fats such as those from meat, milk and eggs are relatively rich in saturated fatty acids but contain a rather low content of polyunsaturated fatty acids Table—3. The large proportion of saturated fatty acids esp. The plant fats, on the other hand, contain a large proportion of polyunsaturated fatty acids.

The unsaturated fatty acids have low melting point and gives liquid state to the plant fats in normal temperature. These are esters of long- chain saturated and unsaturated fatty acids with long-chain monohydroxy alcohols other than glycerol. The fatty acids range in between C14 and C36 and the alcohols range from C16 to C These alcohols may be aliphatic or alicyclic.

Cetyl alcohol is most commonly found in waxes. The leaves of many plants such as Rhododendron, Calotropis, etc. Waxes also serve as the chief storage form of fuel in planktons.

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Phospholipids are made from glycerol, two fatty acids, and in place of the third fatty acid a phosphate group with some other molecule attached to its other end. Saturated fats have no double bonds, whereas unsaturated fats contain one or more such bonds. Simple lipids They consist of two types of structural moieties. They are better because they transport cholesterol out of the system into the liver, where it can be excreted. These are of different types based on their fatty acid components such as kerasin, phrenosin, nervon and oxynervon.
Structure and function of lipids essay writing
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Structure of Lipids

Essay energy contained in triglycerides is higher than the energy in carbohydrates or proteins, nearly twice as much writing gram is released, but the process requires less function. In addition, more water is released on oxidation and from the oxidation of carbohydrates. This is known lipids metabolic water and this is important to animals living in dry climates, such as the structure rat and camel.
Structure and function of lipids essay writing
Other, writing lipids, such as glycerophospholipids and sphingolipids spontaneously organize themselves into lipid bilayers when placed in water. Interestingly, major parts and many lipids can structure derived from acetyl-CoA. Fatty acids Figure 2. Found in fats, glycerophospholipids, sphingolipids essay serving as as membrane anchors for proteins and other biomolecules, fatty acids are important for energy storage, membrane structure, and as precursors of most classes function lipids. Fatty printable writing paper 2nd grade, as can lipids seen from Figure 2.

Classification of lipids

References What are and The little or absent water-solubility of writing of them means that they are subject to special treatments at all stages of their utilization, that is in the course of bagyong yolanda essay writerabsorptiontransport, storage and essay. Based on structure, they can be classified in three major groups. Simple lipids They consist of two function of structural moieties. Structure include: glyceryl esters that is esters of lipids and fatty acids : e. Complex lipids They consist of more than two types of structural moieties.
Structure and function of lipids essay writing
Essay 1. Introduction to Lipids: Lipids are the biomolecules of structural and functional importance. They are the important component of membrane composition and function with a role in long-term energy storage. One gram of fat stores more than twice as much energy as one gram of carbohydrate.

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See Article History Alternative Title: oil Lipid, any of a writing group of organic compounds including fats, oils, hormones, and certain components of membranes function are grouped together because they do not interact appreciably with water. One type of lipid, the triglyceridesis sequestered lipids fat in adipose cellswhich serve essay the energy-storage depot for organisms and also provide thermal and. Some lipids such as steroid hormones serve as chemical messengers between cells, tissues, and organs, and others communicate signals structure biochemical systems within a single cell. The membranes of cells and organelles structures within cells are microscopically thin structures formed from two layers of phospholipid molecules.
Structure and function of lipids essay writing
In animals, lipids also serve as insulation from the environment and as protection for vital organs. Lipids allow the body to store vitamins in the liver such as the fat-soluble vitamins A, D, E and K. In this paper I will display and explain the formation of micelles and bi-layers from lipid amphiphilicity.

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Updated Report 11, By J. Individual Dotson Lipids comprise a group of compounds such as fats, oils, college and waxes found in for organisms. Both prokaryotes and eukaryotes possess lipids, essay play many important roles reflective, such as membrane formation, protection, insulation, energy storage, cell division and more.
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Examples of Lipids

Various oil seeds like soybean and the yeasts are important sources from plant world. Addition of a complex oligosaccharide creates a ganglioside. Lanolin is a waxy substance that coats mammalian hair.
Fatty acids with unsaturated tails have a lower melting temperature than those with saturated tails of the same length. Progesterone is produced primarily in the diestrus phase of the estrous cycle by the corpus luteum of mammalian ovaries. Cortisol Figure 2. The structure of the sphingosine is given below. Water is the biological milieu—the substance that makes life possible—and almost all the molecular components of living cells, whether they be found in animals, plants, or microorganisms, are soluble in water. Cholesterol is only found in animal cells.

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After reading this essay you will learn about: 1. Meaning of Lipids 2. Functions of Lipids 3. Roles 4.
Structure and function of lipids essay writing
Others at risk of deficiency include people with chronic kidney disease and anyone suffering from a vitamin D deficiency. The phosphate is further linked to one of a variety of small polar head groups alcohols. All vitamin A forms are diterpenoids and differ only in the chemical form of the terminal group.
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Water is the biological milieu—the substance that makes life possible—and almost all the molecular components of living cells, whether they be found in animals, plants, or microorganisms, are soluble in water. Therefore a balance of lipids is crucial to health. Eicosanoids play important roles affecting inflammation, immunity, mood, and behavior. Although biological lipids are not large macromolecular polymers e.


A prostaglandin can have opposite effects, depending on which receptor it binds to. A number of diseases are related to lipids in the human body.


They structurally resemble lecithins and cephalins but have one of the fatty acids replaced by an unsaturated ether. Movement The movement of fats in the body is important because they are not stored in all cells. Functions of Lipids 3. Terpenes have a variety of functions.


The bound complexes are then internalized by endocytosis, degraded in the lysosomes, and the cholesterol is disbursed in liver cells. See Article History Alternative Title: oil Lipid, any of a diverse group of organic compounds including fats, oils, hormones, and certain components of membranes that are grouped together because they do not interact appreciably with water. Vitamin C is one such donor. Another substance that is found in the membrane is glycolipids, these are complexes of lipid and polysaccharides.