4 Families of Organic Compounds with Important Biological Functions

21 Aug.,2023

 

{"appState":{"pageLoadApiCallsStatus":true},"articleState":{"article":{"headers":{"creationTime":"2018-09-24T19:31:19+00:00","modifiedTime":"2018-09-24T19:31:19+00:00","timestamp":"2022-09-14T18:16:47+00:00"},"data":{"breadcrumbs":[{"name":"Academics & The Arts","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33662"},"slug":"academics-the-arts","categoryId":33662},{"name":"Science","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33756"},"slug":"science","categoryId":33756},{"name":"Anatomy","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33757"},"slug":"anatomy","categoryId":33757}],"title":"4 Families of Organic Compounds with Important Biological Functions","strippedTitle":"4 families of organic compounds with important biological functions","slug":"4-families-of-organic-compounds-with-important-biological-functions-2","canonicalUrl":"","seo":{"metaDescription":"When different elements combine through chemical reactions, they form compounds. When compounds contain carbon, they’re called organic compounds. The four famil","noIndex":0,"noFollow":0},"content":"When different elements combine through chemical reactions, they form <em>compounds.</em> When compounds contain carbon, they’re called <em>organic compounds.</em> The four families of organic compounds with important biological functions—carbohydrates, lipids, proteins, and nucleic acids—are covered here.\r\n<h2 id=\"tab1\" >Carbohydrates</h2>\r\nThese molecules consist of carbon, hydrogen, and oxygen in a ratio of roughly 1:2:1.\r\n<p class=\"article-tips tip\">If a test question involves identifying a compound as a carbohydrate, count the atoms and see if they fit that ratio.</p>\r\nCarbohydrates are formed by the chemical reaction process of <em>condensation,</em> or <em>dehydration synthesis,</em> and broken apart by <em>hydrolysis,</em> the cleavage of a compound by a reaction that adds water. There are several subcategories of carbohydrates:\r\n<ul>\r\n \t<li><em>Monosaccharides,</em> or <em>simple sugars,</em> are the building blocks, or <em>monomers,</em> of larger carbohydrate molecules and are a source of stored energy (refer to the figure). Key monomers include <em>glucose</em>, <em>fructose,</em> and <em>galactose.</em> These three have the same numbers of carbon (6), hydrogen (12), and oxygen (6) atoms in each molecule—formally written as C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>—but the bonding arrangements are different. Molecules with this kind of relationship are called <em>isomers.</em> Two important five-carbon monosaccharides (pentoses) are <em>ribose,</em> a component of ribonucleic acids (RNA), and <em>deoxyribose,</em> a component of deoxyribonucleic acids (DNA).</li>\r\n</ul>\r\n[caption id=\"attachment_255785\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255785\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0205.jpg\" alt=\"anatomy-monosaccharides\" width=\"525\" height=\"536\" /> Monosaccharides[/caption]\r\n<ul>\r\n \t<li><em>Disaccharides</em> are sugars formed by the bonding of two monosaccharides, including <em>sucrose</em> (table sugar), <em>lactose,</em> and <em>maltose.</em></li>\r\n \t<li><em>Oligosaccharides</em> (from the Greek <em>oligo,</em> a few, and <em>sacchar,</em> sugar) contain three to nine simple sugars that serve many functions. They are found on plasma membranes of cells where they function in cell-to-cell recognition.</li>\r\n \t<li><em>Polysaccharides</em> are <em>polymers,</em> formed when many monomers bond into long, chainlike molecules. <em>Glycogen</em> is the primary polymer in the body; it breaks down into individual monomers of glucose, which cells use to generate usable energy.</li>\r\n</ul>\r\n<h2 id=\"tab2\" >Lipids</h2>\r\nThe most commonly known lipids are fats. These molecules consist of a 3-carbon <em>glycerol</em> linked to <em>fatty acid chains</em>. Insoluble in water because they contain an abundance of nonpolar bonds, lipid molecules have six times more stored energy than carbohydrate molecules. Upon hydrolysis, however, most fats form glycerol and fatty acids. A fatty acid is a long, straight chain of carbon atoms with hydrogen atoms attached, as shown here.\r\n\r\n[caption id=\"attachment_255786\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255786\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0206.jpg\" alt=\"anatomy-fatty-acids\" width=\"525\" height=\"139\" /> Fatty acids[/caption]\r\n\r\nIf the carbon chain has its full number of hydrogen atoms, the fatty acid is <em>saturated</em> (examples include butter and lard). If the carbon chain has less than its full number of hydrogen atoms due to double bonds, the fatty acid is <em>unsaturated</em> (examples include margarine and vegetable oils). <em>Phospholipids,</em> as the name suggests, contain phosphorus and often nitrogen in place of one fatty acid chain. These are aligned side-by-side to form the cell membrane. Other lipids include cholesterol, vitamins A and D, and the <em>steroid hormones</em>.\r\n<h2 id=\"tab3\" >Proteins</h2>\r\nAmong the largest molecules, proteins can reach molecular weights of some 40 million atomic units. Proteins always contain hydrogen, oxygen, nitrogen, and carbon, and sometimes contain phosphorus and sulfur. Examples of proteins in the body include <em>antibodies, hemoglobin</em> (the red pigment in red blood cells), and <em>enzymes</em> (catalysts that accelerate reactions in the body).\r\n\r\nThe human body builds protein molecules using 20 different kinds of monomers called <em>amino acids</em> (refer to the figure).\r\n\r\n[caption id=\"attachment_255787\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255787\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0207.jpg\" alt=\"anatomy-protein\" width=\"525\" height=\"422\" /> Amino acids in a protein molecule[/caption]\r\n\r\nAn amino acid is a carbon atom attached to a hydrogen atom, an <em>amino group</em> (-NH<sub>2</sub>), a <em>carboxyl group</em> (-COOH), and a unique side chain called the <em>R group</em>. Amino acids link together by <em>peptide bonds</em> to form long molecules called <em>polypeptides,</em> which then assemble into proteins. These bonds form when the carboxyl group of one molecule reacts with the amino group of another molecule, releasing a molecule of water <em>(dehydration synthesis).</em> A polypeptide, however, is not a functioning protein. It must then be folded, twisted, and often linked with other polypeptides to create a three-dimensional structure which allows it to carry out its function.\r\n<h2 id=\"tab4\" >Nucleic acids</h2>\r\nThese long molecules, found primarily in the cell’s nucleus, act as the body’s genetic blueprint. They’re comprised of smaller building blocks called <em>nucleotides.</em> Each nucleotide, in turn, is composed of a five-carbon sugar (<em>deoxyribose</em> or <em>ribose</em>), a phosphate group, and a nitrogenous base. The sugar and phosphate groups link to form the backbone of the molecule. The base is attached to the sugar and aligns with its partner on the other strand, as shown in the figure.\r\n\r\n[caption id=\"attachment_255788\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255788\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0208.jpg\" alt=\"anatomy-double-helix\" width=\"525\" height=\"894\" /> The DNA double helix[/caption]\r\n\r\nThe nitrogenous bases in DNA are <em>adenine, thymine, cytosine,</em> and <em>guanine;</em> they always pair off A-T and C-G forming hydrogen bonds between the bases, creating the rungs of the DNA ladder. In RNA, which occurs in a single strand, thymine is replaced by <em>uracil,</em> so the nucleotides pair off A-U and C-G during transcription.","description":"When different elements combine through chemical reactions, they form <em>compounds.</em> When compounds contain carbon, they’re called <em>organic compounds.</em> The four families of organic compounds with important biological functions—carbohydrates, lipids, proteins, and nucleic acids—are covered here.\r\n<h2 id=\"tab1\" >Carbohydrates</h2>\r\nThese molecules consist of carbon, hydrogen, and oxygen in a ratio of roughly 1:2:1.\r\n<p class=\"article-tips tip\">If a test question involves identifying a compound as a carbohydrate, count the atoms and see if they fit that ratio.</p>\r\nCarbohydrates are formed by the chemical reaction process of <em>condensation,</em> or <em>dehydration synthesis,</em> and broken apart by <em>hydrolysis,</em> the cleavage of a compound by a reaction that adds water. There are several subcategories of carbohydrates:\r\n<ul>\r\n \t<li><em>Monosaccharides,</em> or <em>simple sugars,</em> are the building blocks, or <em>monomers,</em> of larger carbohydrate molecules and are a source of stored energy (refer to the figure). Key monomers include <em>glucose</em>, <em>fructose,</em> and <em>galactose.</em> These three have the same numbers of carbon (6), hydrogen (12), and oxygen (6) atoms in each molecule—formally written as C<sub>6</sub>H<sub>12</sub>O<sub>6</sub>—but the bonding arrangements are different. Molecules with this kind of relationship are called <em>isomers.</em> Two important five-carbon monosaccharides (pentoses) are <em>ribose,</em> a component of ribonucleic acids (RNA), and <em>deoxyribose,</em> a component of deoxyribonucleic acids (DNA).</li>\r\n</ul>\r\n[caption id=\"attachment_255785\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255785\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0205.jpg\" alt=\"anatomy-monosaccharides\" width=\"525\" height=\"536\" /> Monosaccharides[/caption]\r\n<ul>\r\n \t<li><em>Disaccharides</em> are sugars formed by the bonding of two monosaccharides, including <em>sucrose</em> (table sugar), <em>lactose,</em> and <em>maltose.</em></li>\r\n \t<li><em>Oligosaccharides</em> (from the Greek <em>oligo,</em> a few, and <em>sacchar,</em> sugar) contain three to nine simple sugars that serve many functions. They are found on plasma membranes of cells where they function in cell-to-cell recognition.</li>\r\n \t<li><em>Polysaccharides</em> are <em>polymers,</em> formed when many monomers bond into long, chainlike molecules. <em>Glycogen</em> is the primary polymer in the body; it breaks down into individual monomers of glucose, which cells use to generate usable energy.</li>\r\n</ul>\r\n<h2 id=\"tab2\" >Lipids</h2>\r\nThe most commonly known lipids are fats. These molecules consist of a 3-carbon <em>glycerol</em> linked to <em>fatty acid chains</em>. Insoluble in water because they contain an abundance of nonpolar bonds, lipid molecules have six times more stored energy than carbohydrate molecules. Upon hydrolysis, however, most fats form glycerol and fatty acids. A fatty acid is a long, straight chain of carbon atoms with hydrogen atoms attached, as shown here.\r\n\r\n[caption id=\"attachment_255786\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255786\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0206.jpg\" alt=\"anatomy-fatty-acids\" width=\"525\" height=\"139\" /> Fatty acids[/caption]\r\n\r\nIf the carbon chain has its full number of hydrogen atoms, the fatty acid is <em>saturated</em> (examples include butter and lard). If the carbon chain has less than its full number of hydrogen atoms due to double bonds, the fatty acid is <em>unsaturated</em> (examples include margarine and vegetable oils). <em>Phospholipids,</em> as the name suggests, contain phosphorus and often nitrogen in place of one fatty acid chain. These are aligned side-by-side to form the cell membrane. Other lipids include cholesterol, vitamins A and D, and the <em>steroid hormones</em>.\r\n<h2 id=\"tab3\" >Proteins</h2>\r\nAmong the largest molecules, proteins can reach molecular weights of some 40 million atomic units. Proteins always contain hydrogen, oxygen, nitrogen, and carbon, and sometimes contain phosphorus and sulfur. Examples of proteins in the body include <em>antibodies, hemoglobin</em> (the red pigment in red blood cells), and <em>enzymes</em> (catalysts that accelerate reactions in the body).\r\n\r\nThe human body builds protein molecules using 20 different kinds of monomers called <em>amino acids</em> (refer to the figure).\r\n\r\n[caption id=\"attachment_255787\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255787\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0207.jpg\" alt=\"anatomy-protein\" width=\"525\" height=\"422\" /> Amino acids in a protein molecule[/caption]\r\n\r\nAn amino acid is a carbon atom attached to a hydrogen atom, an <em>amino group</em> (-NH<sub>2</sub>), a <em>carboxyl group</em> (-COOH), and a unique side chain called the <em>R group</em>. Amino acids link together by <em>peptide bonds</em> to form long molecules called <em>polypeptides,</em> which then assemble into proteins. These bonds form when the carboxyl group of one molecule reacts with the amino group of another molecule, releasing a molecule of water <em>(dehydration synthesis).</em> A polypeptide, however, is not a functioning protein. It must then be folded, twisted, and often linked with other polypeptides to create a three-dimensional structure which allows it to carry out its function.\r\n<h2 id=\"tab4\" >Nucleic acids</h2>\r\nThese long molecules, found primarily in the cell’s nucleus, act as the body’s genetic blueprint. They’re comprised of smaller building blocks called <em>nucleotides.</em> Each nucleotide, in turn, is composed of a five-carbon sugar (<em>deoxyribose</em> or <em>ribose</em>), a phosphate group, and a nitrogenous base. The sugar and phosphate groups link to form the backbone of the molecule. The base is attached to the sugar and aligns with its partner on the other strand, as shown in the figure.\r\n\r\n[caption id=\"attachment_255788\" align=\"alignnone\" width=\"525\"]<img class=\"size-full wp-image-255788\" src=\"https://www.dummies.com/wp-content/uploads/9781119473596-fg0208.jpg\" alt=\"anatomy-double-helix\" width=\"525\" height=\"894\" /> The DNA double helix[/caption]\r\n\r\nThe nitrogenous bases in DNA are <em>adenine, thymine, cytosine,</em> and <em>guanine;</em> they always pair off A-T and C-G forming hydrogen bonds between the bases, creating the rungs of the DNA ladder. In RNA, which occurs in a single strand, thymine is replaced by <em>uracil,</em> so the nucleotides pair off A-U and C-G during transcription.","blurb":"","authors":[{"authorId":11358,"name":"Erin Odya","slug":"erin-odya","description":" <p><b>Erin Odya</b> teaches Anatomy &#38; Physiology at Carmel High School in Carmel, Indiana, one of Indiana&#39;s top schools. She is also the author of <i>Anatomy &#38; Physiology For Dummies.</i> <p><b>Pat DuPree</b> taught anatomy/physiology, biology, medical terminology, and environmental science. ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/11358"}},{"authorId":9301,"name":"Pat DuPree","slug":"pat-dupree","description":" <p><b>Erin Odya</b> teaches Anatomy &#38; Physiology at Carmel High School in Carmel, Indiana, one of Indiana&#39;s top schools. She is also the author of <i>Anatomy &#38; Physiology For Dummies.</i> <p><b>Pat DuPree</b> taught anatomy/physiology, biology, medical terminology, and environmental science. ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/9301"}}],"primaryCategoryTaxonomy":{"categoryId":33757,"title":"Anatomy","slug":"anatomy","_links":{"self":"https://dummies-api.dummies.com/v2/categories/33757"}},"secondaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"tertiaryCategoryTaxonomy":{"categoryId":0,"title":null,"slug":null,"_links":null},"trendingArticles":null,"inThisArticle":[{"label":"Carbohydrates","target":"#tab1"},{"label":"Lipids","target":"#tab2"},{"label":"Proteins","target":"#tab3"},{"label":"Nucleic acids","target":"#tab4"}],"relatedArticles":{"fromBook":[{"articleId":258561,"title":"What Your Blood Pressure Readings Can Tell You","slug":"what-your-blood-pressure-readings-can-tell-you","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/258561"}},{"articleId":256333,"title":"How Our Innate and Adaptive Defenses Protect Us","slug":"how-our-innate-and-adaptive-defenses-protect-us","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/256333"}},{"articleId":255779,"title":"How Lymph Nodes Work","slug":"how-lymph-nodes-work","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/255779"}},{"articleId":255776,"title":"The Breathing Process","slug":"the-breathing-process","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/255776"}},{"articleId":255140,"title":"Identifying Anatomical Position and Body Planes","slug":"identifying-anatomical-position-and-body-planes","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/255140"}}],"fromCategory":[{"articleId":258561,"title":"What Your Blood Pressure Readings Can Tell You","slug":"what-your-blood-pressure-readings-can-tell-you","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/258561"}},{"articleId":256333,"title":"How Our Innate and Adaptive Defenses Protect Us","slug":"how-our-innate-and-adaptive-defenses-protect-us","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/256333"}},{"articleId":255779,"title":"How Lymph Nodes Work","slug":"how-lymph-nodes-work","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/255779"}},{"articleId":255776,"title":"The Breathing Process","slug":"the-breathing-process","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/255776"}},{"articleId":255140,"title":"Identifying Anatomical Position and Body Planes","slug":"identifying-anatomical-position-and-body-planes","categoryList":["academics-the-arts","science","anatomy"],"_links":{"self":"https://dummies-api.dummies.com/v2/articles/255140"}}]},"hasRelatedBookFromSearch":false,"relatedBook":{"bookId":281947,"slug":"anatomy-physiology-workbook-for-dummies-with-online-practice-3rd-edition","isbn":"9781119473596","categoryList":["academics-the-arts","science","anatomy"],"amazon":{"default":"https://www.amazon.com/gp/product/1119473594/ref=as_li_tl?ie=UTF8&tag=wiley01-20","ca":"https://www.amazon.ca/gp/product/1119473594/ref=as_li_tl?ie=UTF8&tag=wiley01-20","indigo_ca":"http://www.tkqlhce.com/click-9208661-13710633?url=https://www.chapters.indigo.ca/en-ca/books/product/1119473594-item.html&cjsku=978111945484","gb":"https://www.amazon.co.uk/gp/product/1119473594/ref=as_li_tl?ie=UTF8&tag=wiley01-20","de":"https://www.amazon.de/gp/product/1119473594/ref=as_li_tl?ie=UTF8&tag=wiley01-20"},"image":{"src":"https://www.dummies.com/wp-content/uploads/anatomy-and-physiology-workbook-for-dummies-3rd-edition-cover-9781119473596-204x255.jpg","width":204,"height":255},"title":"Anatomy & Physiology Workbook For Dummies with Online Practice","testBankPinActivationLink":"","bookOutOfPrint":false,"authorsInfo":"<p><b data-author-id=\"11358\">Erin Odya</b> teaches Anatomy &amp; Physiology at Carmel High School in Carmel, Indiana, one of Indiana's top schools. She is also the author of <i>Anatomy &amp; Physiology For Dummies.</i> </p>\n<p><b data-author-id=\"9301\">Pat DuPree</b> taught anatomy/physiology, biology, medical terminology, and environmental science. </p>","authors":[{"authorId":11358,"name":"Erin Odya","slug":"erin-odya","description":" <p><b>Erin Odya</b> teaches Anatomy &#38; Physiology at Carmel High School in Carmel, Indiana, one of Indiana&#39;s top schools. She is also the author of <i>Anatomy &#38; Physiology For Dummies.</i> <p><b>Pat DuPree</b> taught anatomy/physiology, biology, medical terminology, and environmental science. ","hasArticle":false,"_links":{"self":"https://dummies-api.dummies.com/v2/authors/11358"}},{"authorId":9301,"name":"Pat DuPree","slug":"pat-dupree","description":" <p><b>Erin Odya</b> teaches Anatomy &#38; Physiology at Carmel High School in Carmel, Indiana, one of Indiana&#39;s top schools. 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