{"id":2209,"date":"2016-05-16T17:00:05","date_gmt":"2016-05-16T17:00:05","guid":{"rendered":"https:\/\/courses.lumenlearning.com\/biologyxwaymakerxmaster\/?post_type=chapter&#038;p=2209"},"modified":"2024-04-26T18:48:39","modified_gmt":"2024-04-26T18:48:39","slug":"reading-phospholipids","status":"publish","type":"chapter","link":"https:\/\/courses.lumenlearning.com\/wm-biology1\/chapter\/reading-phospholipids\/","title":{"raw":"Phospholipids","rendered":"Phospholipids"},"content":{"raw":"<div class=\"textbox learning-objectives\">\r\n<h3>Learning Outcomes<\/h3>\r\n<ul>\r\n \t<li>Explain why hydrophilic substances cannot pass through the interior of the cell membrane<\/li>\r\n<\/ul>\r\n<\/div>\r\nAs we just learned, the main fabric of the membrane is composed of two layers of phospholipid molecules.\u00a0The <span data-type=\"term\">hydrophilic<\/span> or \u201cwater-loving\u201d areas of these molecules (which looks like a collection of balls in an artist\u2019s rendition of the model) (Figure\u00a01) are in contact with the aqueous fluid both inside and outside the cell.\u00a0Thus, both surfaces of the plasma membrane are hydrophilic. In contrast, the interior of the membrane, between its two surfaces, is a hydrophobic or nonpolar region because of the fatty acid tails. This region has no attraction for water or other polar molecules (we will discuss this further in the next page).\r\n\r\n[caption id=\"attachment_1603\" align=\"alignnone\" width=\"899\"]<img class=\"wp-image-1603 size-full\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/110\/2016\/05\/02231126\/Figure_05_01_01.jpg\" alt=\"This illustration shows a phospholipid bilayer with proteins and cholesterol embedded in it. Integral membrane proteins span the entire membrane. Protein channels are integral membrane proteins with a central pore through which molecules can pass. Peripheral proteins are associated with the phospholipid head groups on one side of the membrane only. A glycoprotein is shown with the protein portion of the molecule embedded in the membrane and the carbohydrate portion jutting out from the membrane. A glycolipid is also shown with the lipid portion embedded in the membrane and the carbohydrate portion jutting out of the membrane.\" width=\"899\" height=\"437\" \/> Figure\u00a01. The fluid mosaic model of the plasma membrane structure describes the plasma membrane as a fluid combination of phospholipids, cholesterol, proteins, and carbohydrates.[\/caption]\r\n\r\n<span data-type=\"term\">Hydrophobic<\/span>, or water-hating molecules, tend to be non-polar. They interact with other non-polar molecules in chemical reactions, but generally do not interact with polar molecules. When placed in water, hydrophobic molecules tend to form a ball or cluster. The hydrophilic regions of the phospholipids tend to form hydrogen bonds with water and other polar molecules on both the exterior and interior of the cell. Thus, the membrane surfaces that face the interior and exterior of the cell are hydrophilic. In contrast, the interior of the cell membrane is hydrophobic and will not interact with water. Therefore, phospholipids form an excellent two-layer cell membrane that separates fluid within the cell from the fluid outside of the cell.\r\n\r\nA phospholipid molecule (Figure\u00a02) consists of a three-carbon glycerol backbone with two fatty acid molecules attached to carbons 1 and 2, and a phosphate-containing group attached to the third carbon.\r\n\r\nThis arrangement gives the overall molecule an area described as its head (the phosphate-containing group), which has a polar character or negative charge, and an area called the tail (the fatty acids), which has no charge. The head can form hydrogen bonds, but the tail cannot. A molecule with this arrangement of a positively or negatively charged area and an uncharged, or non-polar, area is referred to as <span data-type=\"term\">amphiphilic<\/span> or \u201cdual-loving.\u201d\r\n<div id=\"fig-ch05_01_02\" class=\"os-figure\">\r\n<figure data-id=\"fig-ch05_01_02\">\r\n\r\n[caption id=\"\" align=\"aligncenter\" width=\"850\"]<img id=\"94755\" class=\"\" src=\"https:\/\/openstax.org\/resources\/c26a0c1bfcf4afb4693bcd93c9375c12686672bc\" alt=\"An illustration of a phospholipid shows a hydrophilic head group composed of phosphate connected to a three-carbon glycerol molecule, and two hydrophobic tails composed of long hydrocarbon chains.\" width=\"850\" height=\"546\" data-media-type=\"image\/png\" \/> Figure\u00a02.\u00a0A hydrophilic head and two hydrophobic tails comprise this phospholipid molecule. The hydrophilic head group consists of a phosphate-containing group attached to a glycerol molecule. The hydrophobic tails, each containing either a saturated or an unsaturated fatty acid, are long hydrocarbon chains.[\/caption]<\/figure>\r\n<\/div>\r\nThis characteristic is vital to the structure of a plasma membrane because, in water, phospholipids tend to become arranged with their hydrophobic tails facing each other and their hydrophilic heads facing out. In this way, they form a lipid bilayer\u2014a barrier composed of a double layer of phospholipids that separates the water and other materials on one side of the barrier from the water and other materials on the other side. In fact, phospholipids heated in an aqueous solution tend to spontaneously form small spheres or droplets (called micelles or liposomes), with their hydrophilic heads forming the exterior and their hydrophobic tails on the inside (Figure\u00a03).\r\n\r\n[caption id=\"attachment_2219\" align=\"aligncenter\" width=\"850\"]<img class=\" wp-image-2219\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/110\/2016\/05\/16165713\/Figure_05_01_03.jpg\" alt=\"The image on the left shows a spherical lipid bilayer. The image on the right shows a smaller sphere that has a single lipid layer only. The image at the bottom shows a lipid bilayer sheet.\" width=\"850\" height=\"386\" \/> Figure\u00a03. In an aqueous solution, phospholipids tend to arrange themselves with their polar heads facing outward and their hydrophobic tails facing inward. (credit: modification of work by Mariana Ruiz Villareal)[\/caption]\r\n\r\n<div class=\"textbox tryit\">\r\n<h3>Try It<\/h3>\r\nhttps:\/\/assess.lumenlearning.com\/practice\/311540ee-84df-4aa0-99b8-6037708d6082\r\n<\/div>","rendered":"<div class=\"textbox learning-objectives\">\n<h3>Learning Outcomes<\/h3>\n<ul>\n<li>Explain why hydrophilic substances cannot pass through the interior of the cell membrane<\/li>\n<\/ul>\n<\/div>\n<p>As we just learned, the main fabric of the membrane is composed of two layers of phospholipid molecules.\u00a0The <span data-type=\"term\">hydrophilic<\/span> or \u201cwater-loving\u201d areas of these molecules (which looks like a collection of balls in an artist\u2019s rendition of the model) (Figure\u00a01) are in contact with the aqueous fluid both inside and outside the cell.\u00a0Thus, both surfaces of the plasma membrane are hydrophilic. In contrast, the interior of the membrane, between its two surfaces, is a hydrophobic or nonpolar region because of the fatty acid tails. This region has no attraction for water or other polar molecules (we will discuss this further in the next page).<\/p>\n<div id=\"attachment_1603\" style=\"width: 909px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1603\" class=\"wp-image-1603 size-full\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/110\/2016\/05\/02231126\/Figure_05_01_01.jpg\" alt=\"This illustration shows a phospholipid bilayer with proteins and cholesterol embedded in it. Integral membrane proteins span the entire membrane. Protein channels are integral membrane proteins with a central pore through which molecules can pass. Peripheral proteins are associated with the phospholipid head groups on one side of the membrane only. A glycoprotein is shown with the protein portion of the molecule embedded in the membrane and the carbohydrate portion jutting out from the membrane. A glycolipid is also shown with the lipid portion embedded in the membrane and the carbohydrate portion jutting out of the membrane.\" width=\"899\" height=\"437\" \/><\/p>\n<p id=\"caption-attachment-1603\" class=\"wp-caption-text\">Figure\u00a01. The fluid mosaic model of the plasma membrane structure describes the plasma membrane as a fluid combination of phospholipids, cholesterol, proteins, and carbohydrates.<\/p>\n<\/div>\n<p><span data-type=\"term\">Hydrophobic<\/span>, or water-hating molecules, tend to be non-polar. They interact with other non-polar molecules in chemical reactions, but generally do not interact with polar molecules. When placed in water, hydrophobic molecules tend to form a ball or cluster. The hydrophilic regions of the phospholipids tend to form hydrogen bonds with water and other polar molecules on both the exterior and interior of the cell. Thus, the membrane surfaces that face the interior and exterior of the cell are hydrophilic. In contrast, the interior of the cell membrane is hydrophobic and will not interact with water. Therefore, phospholipids form an excellent two-layer cell membrane that separates fluid within the cell from the fluid outside of the cell.<\/p>\n<p>A phospholipid molecule (Figure\u00a02) consists of a three-carbon glycerol backbone with two fatty acid molecules attached to carbons 1 and 2, and a phosphate-containing group attached to the third carbon.<\/p>\n<p>This arrangement gives the overall molecule an area described as its head (the phosphate-containing group), which has a polar character or negative charge, and an area called the tail (the fatty acids), which has no charge. The head can form hydrogen bonds, but the tail cannot. A molecule with this arrangement of a positively or negatively charged area and an uncharged, or non-polar, area is referred to as <span data-type=\"term\">amphiphilic<\/span> or \u201cdual-loving.\u201d<\/p>\n<div id=\"fig-ch05_01_02\" class=\"os-figure\">\n<figure data-id=\"fig-ch05_01_02\">\n<div style=\"width: 860px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" id=\"94755\" class=\"\" src=\"https:\/\/openstax.org\/resources\/c26a0c1bfcf4afb4693bcd93c9375c12686672bc\" alt=\"An illustration of a phospholipid shows a hydrophilic head group composed of phosphate connected to a three-carbon glycerol molecule, and two hydrophobic tails composed of long hydrocarbon chains.\" width=\"850\" height=\"546\" data-media-type=\"image\/png\" \/><\/p>\n<p class=\"wp-caption-text\">Figure\u00a02.\u00a0A hydrophilic head and two hydrophobic tails comprise this phospholipid molecule. The hydrophilic head group consists of a phosphate-containing group attached to a glycerol molecule. The hydrophobic tails, each containing either a saturated or an unsaturated fatty acid, are long hydrocarbon chains.<\/p>\n<\/div>\n<\/figure>\n<\/div>\n<p>This characteristic is vital to the structure of a plasma membrane because, in water, phospholipids tend to become arranged with their hydrophobic tails facing each other and their hydrophilic heads facing out. In this way, they form a lipid bilayer\u2014a barrier composed of a double layer of phospholipids that separates the water and other materials on one side of the barrier from the water and other materials on the other side. In fact, phospholipids heated in an aqueous solution tend to spontaneously form small spheres or droplets (called micelles or liposomes), with their hydrophilic heads forming the exterior and their hydrophobic tails on the inside (Figure\u00a03).<\/p>\n<div id=\"attachment_2219\" style=\"width: 860px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2219\" class=\"wp-image-2219\" src=\"https:\/\/s3-us-west-2.amazonaws.com\/courses-images\/wp-content\/uploads\/sites\/110\/2016\/05\/16165713\/Figure_05_01_03.jpg\" alt=\"The image on the left shows a spherical lipid bilayer. The image on the right shows a smaller sphere that has a single lipid layer only. The image at the bottom shows a lipid bilayer sheet.\" width=\"850\" height=\"386\" \/><\/p>\n<p id=\"caption-attachment-2219\" class=\"wp-caption-text\">Figure\u00a03. In an aqueous solution, phospholipids tend to arrange themselves with their polar heads facing outward and their hydrophobic tails facing inward. (credit: modification of work by Mariana Ruiz Villareal)<\/p>\n<\/div>\n<div class=\"textbox tryit\">\n<h3>Try It<\/h3>\n<p>\t<iframe id=\"assessment_practice_311540ee-84df-4aa0-99b8-6037708d6082\" class=\"resizable\" src=\"https:\/\/assess.lumenlearning.com\/practice\/311540ee-84df-4aa0-99b8-6037708d6082?iframe_resize_id=assessment_practice_id_311540ee-84df-4aa0-99b8-6037708d6082\" frameborder=\"0\" style=\"border:none;width:100%;height:100%;min-height:300px;\"><br \/>\n\t<\/iframe>\n<\/div>\n\n\t\t\t <section class=\"citations-section\" role=\"contentinfo\">\n\t\t\t <h3>Candela Citations<\/h3>\n\t\t\t\t\t <div>\n\t\t\t\t\t\t <div id=\"citation-list-2209\">\n\t\t\t\t\t\t\t <div class=\"licensing\"><div class=\"license-attribution-dropdown-subheading\">CC licensed content, Shared previously<\/div><ul class=\"citation-list\"><li>Biology 2e. <strong>Provided by<\/strong>: OpenStax. <strong>Located at<\/strong>: <a target=\"_blank\" href=\"http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8\">http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8<\/a>. <strong>License<\/strong>: <em><a target=\"_blank\" rel=\"license\" href=\"https:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY: Attribution<\/a><\/em>. <strong>License Terms<\/strong>: Access for free at https:\/\/openstax.org\/books\/biology-2e\/pages\/1-introduction<\/li><\/ul><\/div>\n\t\t\t\t\t\t <\/div>\n\t\t\t\t\t <\/div>\n\t\t\t <\/section>","protected":false},"author":17,"menu_order":4,"template":"","meta":{"_candela_citation":"[{\"type\":\"cc\",\"description\":\"Biology 2e\",\"author\":\"\",\"organization\":\"OpenStax\",\"url\":\"http:\/\/cnx.org\/contents\/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8\",\"project\":\"\",\"license\":\"cc-by\",\"license_terms\":\"Access for free at https:\/\/openstax.org\/books\/biology-2e\/pages\/1-introduction\"}]","CANDELA_OUTCOMES_GUID":"7994b072-e22d-47cd-a465-a2db96670981, 317f18a3-f729-4a03-8472-887877aa992f","pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-2209","chapter","type-chapter","status-publish","hentry"],"part":130,"_links":{"self":[{"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/chapters\/2209","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/wp\/v2\/users\/17"}],"version-history":[{"count":16,"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/chapters\/2209\/revisions"}],"predecessor-version":[{"id":5896,"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/chapters\/2209\/revisions\/5896"}],"part":[{"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/parts\/130"}],"metadata":[{"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/chapters\/2209\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/wp\/v2\/media?parent=2209"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/pressbooks\/v2\/chapter-type?post=2209"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/wp\/v2\/contributor?post=2209"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/courses.lumenlearning.com\/wm-biology1\/wp-json\/wp\/v2\/license?post=2209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}