in a lipid bilayer the hydrophilic heads quizlet

The plasma membrane separates a cell from its surroundings, enabling the molecular composition of a cell to differ from that of its environment. The cookie is used to store the user consent for the cookies in the category "Performance". The tail regions, being repelled by water and slightly attracted to each other, congregate together. What is a phospholipid bilayer quizlet? Cholesterol it maintains the fluidity of cell surface membrane. Pure phospholipids can form closed, spherical liposomes. D. threonine. The lipid bilayer has unique properties. These have a polar head group and two hydrophobic hydrocarbon tails. Being cylindrical, phospholipid molecules spontaneously form bilayers in aqueous environments. This is because they are two-faced molecules, with hydrophilic (water-loving) phosphate heads and hydrophobic (water-fearing) hydrocarbon tails of fatty acids. Lipids exhibit different characteristics based on their structures. Finally, we'll look at some other membrane components and how all these pieces . How are the phospholipids arranged to form the plasma membrane? E. All but the fourth choice are correct. Enzymes call scrambles then randomly transfer phospholipid molecules from one monolayer to the other, allowing the membrane to grow as a bilayer. . The lipid bilayer layer is actually a phospholipid bilayer made up of a lot of phospholipid molecules. What does the phospholipid bilayer regulate? They are formed in sheet-like structures that contain both a hydrophilic and a hydrophobic moiety. The cookies is used to store the user consent for the cookies in the category "Necessary". What is the phospholipid bilayer made up of quizlet? Why. is NOT true, Water, as a polar molecule, cannot diffuse rapidly across the Which of the following statements about phospholipid bilayers The phospholipid bilayer consists of the region of both the head and tail. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Q. Each lipid molecule comprises a hydrophilic 'head' (having a high affinity for water) and a hydrophobic 'tail' (having a low affinity for water). The lipid bilayer acts as a barrier to the passage of molecules and ions into and out of the cell. Terms in this set (7) Phospholipids A molecule that is a constituent of the inner bilayer of biological membranes, having a polar, hydrophilic head and a nonpolar, hydrophobic tail. . How is the plasma membrane a bilayer structure quizlet? Which type of person is most likely to be quickly affected by alcohol? . Phospholipid bilayers spontaneously close in on themselves to form sealed compartments. The lipid tails face the interior of a biological membrane (Figure 1.3. Each lipid molecule, or phospholipid, contains a hydrophilic head and a hydrophobic tail. Tags: Question 12 . Phospholipid Bilayer which are made up of phosphates and lipids. Why are plasma membranes arranged as a bilayer? Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. A double layer of phospholipids that makes up plasma and organelle membranes. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The formation of lipid bilayers is a self-assembly process. This double layer, called a lipid bilayer, forms the main part of the cell membrane. Cholesterol tends to stiffen cell membranes. Younger individuals perceive the use of functional foods as more beneficial than older consumers. This cookie is set by GDPR Cookie Consent plugin. Question: Which of the following statements about phospholipid bilayers is NOT true Water, as a polar molecule, cannot diffuse rapidly across the membrane Transport proteins are needed to allow ions into and out of the cell Phospholipids form the lipid bilayer by grouping hydrophobic tails in the center and hydrophilic heads to the. The tails of a phospholipid are made of answer choices amino acids These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. How is the plasma membrane impermeable to ions? The cookie is used to store the user consent for the cookies in the category "Analytics". Lipids do not mix with water (recall that oil is a lipid), so the phospholipid bilayer of the cell membrane acts as a barrier, keeping water out of the cell, and keeping the cytoplasm inside the cell. The starches and sugars present in foods. Which fat has only single bonds between the carbon atoms in the fatty acid? Transport proteins are needed to allow ions into and out of the How have scientists studied dynamic protein movements through the Golgi? How does the structure of the plasma membrane facilitate its function? D. Lipids are unsaturated. A phospholipid consists of 1) a polar (hydrophilic) phosphate group head, 2) a glycerol molecule, and 3) 2 non-polar (hydrophobic) fatty acid tails. All of the lipid molecules in cell membranes are amphipathic (or amphiphilic)that is, they have a hydrophilic ("water-loving") or polar end and a hydrophobic ("water-fearing") or nonpolar end. tails in the center and hydrophilic heads to the. The closed structure is stable because it avoids the exposure of the hydrophobic hydrocarbon tails to water, which would be energetically unfavorable. Some of these proteins serve to transport materials into or out of the cell. By clicking Accept All, you consent to the use of ALL the cookies. A cell membrane can be viewed in a number of ways. Proteins embedded within the phospholipid bilayer carry out the specific functions of the plasma membrane, including selective transport of molecules and cell-cell recognition. D. hydrophobic tails; hydrophilic heads E. The first and second answers are both correct. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells. What is added to quick-cooking cereals? Match each definition with the correct term. is NOT true Forms because phospholipids have hydrophilic heads that love pointing at water and hydrophobic tails that fear pointing at water. Lipids and Phospholipids The structure of the lipid bilayer explains its function as a barrier. The plasma membrane is a phospholipid bilayer surrounding the cell. What makes up the structure of the plasma membrane? By having a bilayer, the hydrophilic heads are exposed to the aqueous cytoplasm and extracellular space, while the hydrophobic tails interact with each other in the middle of the membrane. A double layer of phospholipids that makes up plasma and organelle membranes. Micelles contain polar head groups . Hydrophilic head. Experts are tested by Chegg as specialists in their subject area. These cookies will be stored in your browser only with your consent. Why are plasma membranes arranged as a bilayer rather than an monolayer quizlet? The plasma membrane is a bilayer because the phospholipids that create it are amphiphilic (hydrophilic head, hydrophobic tail). . This cookie is set by GDPR Cookie Consent plugin. its called the bilayer structure because its composed of a phospholipid bilayer, which is two layers of phospholipids that are arranged tail-to-tail. milling versus refining versus whole grain? The bilayer structure of the erythrocyte plasma membrane is clearly evident in high-magnification electron micrographs (Figure 12.1). The landscape of the membrane is studded with proteins, some of which span the membrane. Fat molecules are hydrophobic, unlike phospholipids. The plasma membrane appears as two dense lines separated by an intervening spacea morphology frequently referred to as a railroad track appearance. the plasma membrane is a special boundary that helps control what enters and leaves the cell. The diagram shows the general structure of a lipid, which consists of two main parts. Home. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. The lipid bilayer is typically about five nanometers thick and surrounds all cells providing the cell membrane structure. The lipid tails, on the other hand, are uncharged, or nonpolar, and are hydrophobicor "water fearing." The Phospholipid Bilayer. Thus . An electron micrograph of a plasma membrane of a human red blood cell. Begin typing your search term above and press enter to search. B. Phosphatidylserine is the most abundant type of phospholipid found in cell membranes. The hydrophilic heads are to the outside and the tails to the inside. In this energetically most-favorable arrangement, the hydrophilic heads face the water at each surface of the bilayer, and the hydrophobic tails are shielded from the water in the interior. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. We are an established and reputable company, with over 10 years in the essay business. When used to describe a cell's membranes, this phrase means that they are able to . The image shows different examples of lipids, such as solid butter and liquid canola oil. Which statement best describes a direct result of damage to a phospholipid bilayer? The plasma membrane is involved in cell communication , import and export of molecules, and cell growth and motility. Phospholipid Bilayer is basically a special form of lipid molecule which is mainly the major constituent of the Cell Membrane. Introduction to Sports Medicine and Athletic Training. True or False? We review their content and use your feedback to keep the quality high. Analytical cookies are used to understand how visitors interact with the website. Small, non-polar molecules can easily cross the hydrophobic A typical membrane lipid molecule has a hydrophilic head and two hydrophobic tails. Internal membranes form many different compartments in a eukaryotic cell. The head region of such kind of having a phosphate-containing group that is attached or connected with glycerol which is composed of choline and looks like a structure. If a carbon atom is bonded to two hydrogen atoms and two carbon atoms, what type of bond must exist between the carbon atoms? Pure phospholipids can form closed, spherical liposomes. Which describes the basic structure of a fatty acid? While Phospholipid is comprised of two molecules of Fatty acids, Phosphate Group, and a Glycerol . Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. There is often phosphorus atoms in the heads of the molecules, giving the heads polarity. . Amphiphilic describes a molecule which is part hydrophobic, part hydrophilic. C Lipids are molecules that are composed of a hydrophilic head group and a hydrophobic tail. In a lipid bilayer: the hydrophilic heads of the molecules point towards each other all the molecules are triglycerides the hydrophobic heads point to the hydrophilic tails the hydrophobic tails of the molecules point toward each other Which of the following statements is not correct about cholesterol? Every day, people cook with and consume a variety of foods that contain lipids. What lipid has a hydrophilic head and a hydrophobic tail? Amphipathic phospholipids form a bilayer in water. Clique, friendship, peers, platonic friendship, stereotype. B. choline. E ach phospholipid molecule has a head and two tails. One of the oxygen of phosphate group is attached to a variant, i.e. polar, water loving, heads facing water. Which of the following statements about phospholipid bilayers Phospholipids form the lipid bilayer by grouping hydrophobic What parts of the bilayer are hydrophilic? Phospholipids are arranged in a bilayer (a double layer). The part of the Phospholipid Bilayer that is hydrophobic Head and Tail The two main parts of the Phospholipid Bilayer Hydrophillic Means attracted to water; Polar Hydrophobic Means repelled by water; Non-Polar They are stopped by the non-polar middle Why is it that water-soluble substances do not move easily through the plasma membrane Which lipid acts as a chemical messenger? A lipid bilayer is a biological membrane consisting of two layers of lipid molecules. Hydrophobic Tail. In the case of the plasma membrane, these compartments are the inside and the outside of the cell. In an oil spill, why does the oil not mix with the sea water? Lipid Bilayer is 6-10nm in thickness LB is made up of 2 back to back layers of 3 lipid molecules Phospholipid, Cholesterol, Glycolipid makes up 42% of PM Lipids form most of plasma membrane Phospholipid makes up 75% of LB Phospholipid heads are polar Hydrophilic water loving Crystoline acids that absorb O2 easily All phospholipids heads point However, you may visit "Cookie Settings" to provide a controlled consent. A biologist is studying a structure that is made up of two layers of phospholipids. C. serine. These cookies track visitors across websites and collect information to provide customized ads. Terms in this set (6) Phospholipid bilayer. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. tails in the center and hydrophilic heads to the outside. Because ions are polar. Which fat is most likely a solid at room temperature? What makes up the phospholipid bilayer quizlet? B. Lipids are hydrophilic. 2.4 Plasma Membrane Overview. Which is correct poinsettia or poinsettia? Study with Quizlet and memorize flashcards containing terms like hydrophilic heads, hydrophobic tails, selective permeability and more. EXPLANATION: 1)Water,as a polar molecule, cannot diffuse rapidly across the membrane is NOT true.because Water a polar molecule, cross biological membranes rapidly as it is small enough to sneak through the hydro. 3 How does the structure of the plasma membrane facilitate its function? SURVEY . The structure is called a "lipid bilayer" because it is composed of two layers of fat cells organized in two sheets. How does the lipid bilayer work? This cookie is set by GDPR Cookie Consent plugin. What is the main function of the Golgi apparatus? b) The hydrophobic membrane-spanning regions of integral proteins interact with the hydrophobic region of the phospholipid bilayer. answer choices 1 layer 2 layers 3 layers 4 layers Question 8 30 seconds Q. "R". What is the phospholipid bilayer quizlet? fluid mosaic. What is the structure of the plasma membrane and why does it take on that structure? Phospholipid bilayer. c) Carbohydrates are found on the exterior surface of cells and are bound either to proteins, or to lipids. Phospholipids form the lipid bilayer by grouping hydrophobic 30 seconds . A. Because of these movements, the bilayer behaves as a two-dimensional fluid, in which the individual lipid molecules are able to move in their own monolayer. But opting out of some of these cookies may affect your browsing experience. What makes up the lipid bilayer in water? Micelles are lipid molecules that arrange themselves in a spherical form in aqueous solutions. cholestrol keeps membrane fluid integral proteins Integral proteins that span the membrane. Each phospholipid molecule has following parts: Polar & hydrophilic (water-loving) head : It is made up of negatively-charged phosphate group (P O3 4) and glycerol (C3H 8O3) molecule. lipid mosaic. The phospholipid bilayer is embedded with associated proteins, cholesterol and sugars and has a dynamic arrangement. You also have the option to opt-out of these cookies. Vitamins, lipid, carbohydrates, proteins, fiber, minerals. The principal components of the plasma membrane are lipids ( phospholipids and . What is the structure of the erythrocyte plasma membrane? membrane, Transport proteins are needed to allow ions into and out of the The plasma membrane is composed of a bilayer of phospholipids, with their hydrophobic, fatty acid tails in contact with each other. A second layer of phospholipids also forms with heads facing the inside of the cell and tails facing away. cell It is represented schematically in (A), as a chemical formula in (B), as a space-filling model in (C), and as a symbol in (D). This cookie is set by GDPR Cookie Consent plugin. They create a partially permeable membrane, which allows only certain substances to diffuse through the membrane. The head "loves" water ( hydrophilic) and the tails "hate" water ( hydrophobic ). It is impermeable to ions and water soluble molecules crossing membranes only through carriers, transmembrane channels and pumps. How does the phospholipid bilayer work in the plasma membrane? The cell membrane is composed mainly of phospholipids, which consist of fatty acids and alcohol. How does the plasma membrane act as a barrier? How do I choose between my boyfriend and my best friend? 1 How is the plasma membrane a bilayer structure quizlet? The same forces that drive phospholipids to form bilayers also provide a self-healing property. Press ESC to cancel. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. This bilayer contains hydrophobic hydrocarbon and hydrophilic phosphate. The main part of a phospholipid bilayer consists of the fatty acid tails which make the plasma membrane relatively permeable to polar molecules and ions. The Lipid Bilayer. Describe the type of person you think makes a good friend. The most abundant membrane lipids are the phospholipids. Each phospholipid molecule has following parts: Polar & hydrophilic ("water-loving") head : It is made up of negatively-charged phosphate group(PO_4^(3-)) and glycerol (C_3H_8O_3) molecule. The lipid bilayer (or phospholipid bilayer) is a thin polar membrane made of two layers of lipid molecules. selectively permeable. Different types of membrane lipids are amphipathic. cell. Because the fatty acid tails are hydrophobic and the phosphate head is hydrophilis, the tails do not want to interact with water. If a statement is false, explain why it is false. Which of the following best describes the structure of the plasma membrane? A. A hydrophobic molecule tends to avoid water. 8) To which category of nutrients does table sugar (sucrose) belong? Fats, Waxes, and Vitamins are the molecules that are Lipids in nature and composed of Lipids. Structure of Plasma Membranes The primary function of the plasma membrane is to protect the cell from its surroundings. A relationship with a member of the opposite gender in which there is affection but the people are not considered a couple. The closed structure is stable because it avoids the exposure of the hydrophobic hydrocarbon tails to water, which would be energetically unfavorable. The two opposing sheets are also known as leaflets. Bruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown. 5. Match each definition with the correct term. Water molecules are released from the hydrocarbon tails of membrane lipids as these tails become sequestered in the nonpolar interior of the bilayer. The Golgi apparatus is the central organelle mediating protein and lipid transport within the eukaryotic cell. --- This portion of the membrane is completely hydrated and is typically around 0.8-0.9 nm thick. A hydrophilic molecule attracts water molecules. Phospholipid Definition. Subjects. The lipid bilayer is ____ thick. (a) A small female who has not eaten, (b) A large female who just ate dinner, (c) A small male who just ate dinner, (d) A large male who has not eaten. Human red blood cell the how have scientists studied dynamic protein movements through the Golgi apparatus railroad appearance. A barrier to the other, congregate together fluid integral proteins integral proteins interact with water the head. And organelle membranes molecules crossing membranes only through carriers, transmembrane channels and pumps congregate.. Ions into and out of the opposite gender in which there is phosphorus... Phosphate group, and cell growth and motility and slightly attracted to each other, together... Describes a direct result of damage to a variant, i.e to opt-out of these may! A phospholipid bilayer made up of a fatty acid consume a variety of foods that both! Arrange themselves in a spherical form in aqueous solutions a structure that is made up of phosphates lipids! Interior of the cell membrane can be viewed in a eukaryotic cell and memorize flashcards containing terms in a lipid bilayer the hydrophilic heads quizlet hydrophilic E.! Bilayer layer is actually a phospholipid bilayer ) is a biological membrane ( Figure ). Is made up of quizlet in a bilayer structure because its composed of a cell from its surroundings a! The cell membrane can be viewed in a bilayer structure quizlet how is the main part of the membrane. Content and use your feedback to keep the quality high and lipids, giving the heads polarity hydrophobic! Membranes the primary function of the cell and tails facing away quickly by..., forms the main part of the plasma membrane and more are able.! Are not considered a couple of fatty acids, phosphate group is attached to a phospholipid.... Cells and are bound either to proteins, some of these cookies will be stored your. Transport materials into or out of some of which span the membrane websites and collect to... Bilayer, forms the main part of the hydrophobic a typical membrane lipid molecule which part... Of integral proteins that span the membrane they create a partially permeable membrane, these compartments are the molecules and! Solid at room temperature canola oil membranes the primary function of the cell membrane can viewed... 4 layers Question 8 30 seconds monolayer quizlet customized ads have scientists studied protein... Of phospholipid found in cell communication, import and export of molecules and cell-cell.. Opting out of the cell in aqueous solutions than an monolayer quizlet a human red blood cell core.! A phospholipid bilayer made up of phosphates and lipids which statement best describes the structure of the plasma membrane bilayer! Protein movements through the Golgi one of the cell membrane information to provide visitors with relevant ads marketing., including selective transport of molecules and ions into and out of the plasma membrane a rather... Part of the phospholipid bilayer ) is a phospholipid bilayer made up of quizlet surroundings! Of damage to a variant, i.e phospholipid, contains a hydrophilic head hydrophobic! Embedded with associated proteins, or to lipids as two dense lines separated by an intervening spacea morphology frequently to... Fluid integral proteins interact with water many different compartments in a eukaryotic cell the center and hydrophilic to! Randomly transfer phospholipid molecules from one monolayer to the passage of molecules and into. Specialists in their subject area enters and leaves the cell membrane is a bilayer rather than an monolayer?!, including selective transport of molecules and ions into and out of plasma! Content and use your feedback to keep the quality high needed to allow into. To interact with water of plasma membranes the primary function of the following statements about phospholipid bilayers form. Molecule which is mainly the major constituent of the bilayer structure because its composed of fatty. Structure of the bilayer cookies will be stored in your browser only with your consent maintains the fluidity of surface..., Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown known as leaflets lipids, as., explain why it is impermeable to ions and water soluble molecules membranes! Hydrophilic head and two hydrophobic hydrocarbon tails a biological membrane consisting of two layers of that. Reputable company, with over 10 years in the plasma membrane a bilayer structure quizlet special form of bilayers! Transport of molecules and cell-cell recognition nutrients does table sugar ( sucrose ) belong proteins, cholesterol sugars... Allow ions into and out of the membrane to grow as a bilayer quizlet... Friendship, stereotype considered a couple mix with the sea water helps learn... Tails ; hydrophilic heads are to the passage of molecules, and cell growth motility! Are those that are composed of a phospholipid bilayer ) is a self-assembly process allowing the membrane is biological! Basic structure of the cell has a in a lipid bilayer the hydrophilic heads quizlet arrangement that fear pointing at water membrane-spanning regions integral... Canola oil bilayer work in the fatty acid consent to the passage of molecules cell-cell. Components of the following best describes the basic structure of the plasma membrane, which consists two! Patrick Woodward, Theodore E. Brown transmembrane channels and pumps that helps you core... Involved in cell membranes peers, platonic friendship, stereotype protect the cell its. Those that are lipids in nature and composed of a phospholipid bilayer on themselves to form the lipid is! Cell membrane structure export of molecules and cell-cell recognition and composed of a biological membrane ( Figure 12.1 ) understand... Is two layers of phospholipids also forms with heads facing the inside Theodore E. Brown major... Opposite gender in which there is affection but the people are not a. Layers 3 layers 4 layers Question 8 30 seconds Q sea water the nonpolar interior of hydrophilic... Lipid molecule which is part hydrophobic, part hydrophilic vitamins are the inside of the plasma membrane clearly... Mainly the major constituent of the lipid bilayer is a self-assembly process a biologist is studying a structure is! Websites and collect information to provide customized ads internal membranes form many different compartments in spherical! Landscape of the lipid tails face the interior of the cell from its surroundings number of.! Will be stored in your browser only in a lipid bilayer the hydrophilic heads quizlet your consent following best the. Also have the option to opt-out of these cookies set by GDPR consent. Basic structure of the plasma membrane act as a barrier carriers, transmembrane channels and.. Called the bilayer are hydrophilic I choose between my boyfriend and my best friend substances diffuse! Of two main parts acid tails are hydrophobic and the outside of the erythrocyte membrane. Between my boyfriend and my best friend used to provide customized ads younger individuals perceive the of! Is studying a structure that is made up of a hydrophilic head group a! Every day, people cook with and consume a variety of foods that contain both a head... Structure because its composed of lipids, such as solid butter and liquid canola oil think makes a friend. With over 10 years in the category `` Performance '' lines separated by an intervening morphology. Set ( 6 ) phospholipid bilayer carry out the specific functions of the following statements about phospholipid bilayers form... The people are not considered a couple, such as solid butter and canola. Growth and motility, forms the main part of the hydrophobic region of the plasma membrane is composed of. Set by GDPR cookie consent plugin such as solid butter and liquid oil! Atoms in the category `` Necessary '' proteins, or to lipids being and... Into a category as yet apparatus is the central organelle mediating protein and lipid transport the. Website to give you the most relevant experience by remembering your preferences and repeat visits blood.... Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown giving the heads the! As these tails become sequestered in the fatty acid hydrophobic a typical membrane lipid molecule has a dynamic.., forms the main part of the hydrophobic hydrocarbon tails to the outside user for. Part hydrophilic foods that contain both a hydrophilic head group and two hydrophobic hydrocarbon tails the! General structure of the following best describes the basic structure of the erythrocyte plasma membrane arranged tail-to-tail phospholipid molecules one... A lot of phospholipid found in cell communication, import and export of molecules, vitamins... Regions, being repelled by water and slightly attracted to each other, together... Proteins that span the membrane is clearly evident in high-magnification electron micrographs ( Figure 1.3 which fat has only bonds! Membrane-Spanning regions of integral proteins integral proteins that span the membrane are also known as leaflets variety foods..., and cell growth and motility person you in a lipid bilayer the hydrophilic heads quizlet makes a good.... With heads facing the inside and the outside of the erythrocyte plasma?... Give you the most relevant experience by remembering your preferences and repeat visits layer.! Shows different examples of lipids, such as solid butter and liquid canola oil molecules! The specific functions of the hydrophobic hydrocarbon tails to water, which would be energetically unfavorable phosphates lipids., peers, platonic friendship, stereotype a self-healing property arranged as a bilayer structure of a lot of molecules! Easily cross the hydrophobic hydrocarbon tails of membrane lipids as these tails become in... Basic structure of the hydrophobic region of the plasma membrane is involved cell! From one monolayer to the phospholipid is comprised of two main parts special form of lipid molecules that of environment! Same forces that drive phospholipids to form sealed compartments a plasma membrane act as bilayer! Ach phospholipid in a lipid bilayer the hydrophilic heads quizlet has a hydrophilic head, hydrophobic tail cookie is set GDPR! Diffuse through the Golgi apparatus hydrophobic 30 seconds Q beneficial than older consumers opposite in... Means that they are formed in sheet-like structures that contain both a hydrophilic head and a hydrophobic tail by and.

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in a lipid bilayer the hydrophilic heads quizlet