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Describe how phospholipid molecules are oriented in the plasma membrane of a cell?
Wiki User
∙ 14y ago
The plasma membrane and other membranes of a cell are composed mostly of proteins and a type of lipid called phospholipids. A phospholipids molecule is structured with two fatty acids. The two fatty acids at one end (the tail) of the phospholipids are hydrophobic (not attracted to water). The other end (the head) of the molecule includes a phosphate group, which is negatively charged and hydrophilic (attracted to water). Thus, the tail end of a phospholipids is pushed away by water, while the head is attracted to water.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoPhospholipids play a major role in plasma membranes, as plasma membranes are basically a phospholipid bilayer. Phospholipids consist of a phosphate head and a lipid tail. This membrane stops unknown chemicals or unwanted chemicals from entering the cell.
Edited due to minor grammatical errors.
Wiki User
∙ 14y agoa double layer of phospholipid molecules with hydrophobic tails oriented inward, toward each other
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What type of lipid makes up the cell membranes in your body?
Each cell in the body, depending on its function will have a different type of cell membrane lipid. The most common type of cell membrane is a phospholipid. phospholipids are composed of a glycerol head (polar) which is oriented towards the cytosol and 2 fatty acid tails (non polar) which are oriented together.
Hydrophilic ends of proteins are oriented toward membrane surfaces. true or false?
false
How do water molecules and small ions enter a cell?
Some water molecules and small ions ( depending on charge, other ions need passive or active transport ) can diffuse across the cell's membrane and there are channels called porins that facilitate water molecule passage into the cell.
Are Single stranded DNA molecules are said to be antiparallel when they lined up next to each other but oriented in opposite directions?
Yes. Technically they need to be two individual strands of a double-stranded molecule and not single-stranded molecules in order to be called antiparallel.
What does antiparallel mean?
Anti-parallel means the sides of the DNA double helix.
In a plasma membrane how do the tails of the phospholipid molecules lineup?
they are sandwiched between two layers of heads
How does the structure of phospholipids linear molecules with a polar end and a nonpolar end relate to their function in the cell membrane?
Which is the effect of having the polar and nonpolar ends of phospholipid molecules oriented as they are in this illustration?
The hydrophobic phospholipid tails in the plasma membrane bilayer point toward?
The hydrophobic phospholipid (HPhoPL) tails in the plasma membrane bilayer points toward the other mirrored HPhoPL tailfrom the other side of bilayer. The polar sides point to the outside: the 'water'side of the cel content.
What type of lipid makes up the cell membranes in your body?
Each cell in the body, depending on its function will have a different type of cell membrane lipid. The most common type of cell membrane is a phospholipid. phospholipids are composed of a glycerol head (polar) which is oriented towards the cytosol and 2 fatty acid tails (non polar) which are oriented together.
Describe yourself honest loyal team oriented?
You can describe yourself in an interview as all of these things. You should probably also describe yourself as detail oriented and analytical.
Protein in the plasma membrane not so?
What is not true about protein in the plasma membrane? Glycoproteins contain carbohydrate chains that are oriented toward the inner surface of the membrane
Describe the two common design for desktop computers?
two common designs for desktop computer are1 horizontally oriented system unit2 vertically oriented tower
Hydrophilic ends of proteins are oriented toward membrane surfaces. true or false?
false
How does the structure of erythrocytes relate to their function?
The red cell membrane contains approximately equal amounts of lipids and proteins. Membrane lipids are either phospholipids or neutral lipids, mostly unesterified cholesterol. Membrane phospholipids are asymmetrically arranged into a lipid bilayer two molecules thick. Choline phospholipids are more abundant in the extracellular surface whereas amino phospholipids are more concentrated on the inner leaflet of the bilayer. Cholesterol is intercalated between the phospholipid molecules. The relative amounts of cholesterol and phospholipids are responsible for the fluid properties of the erythrocyte membrane. Alterations in the membrane cholesterol-phospholipid ratio result in morphologically abnormal erythrocytes with decreased life span. Membrane proteins are also asymmetrically oriented within the lipid bilayer and can be divided into three functional sets: structural, catalytic and receptor proteins. Sprectrin and actin are the two main structural proteins that together form a submembranous cytoskeletal meshwork that is responsible for the viscoelastic properties of the erythrocyte membrane. Band 3, or the anion channel, is a major transmembranous protein involved in the transport of water and anions and is a carrier of the blood-group-I antigen. Glycophorin A, a sialic-acid-rich glycoprotein, is the major contact or receptor membrane polypeptide that also spans the lipid bilayer. The MN blood group determinants and possibly other biologic receptor sites have been localized on the extracellular portion of glycophorin A. At least 35 to 40 enzymes are confined to the membrane and, undoubtedly, play a vital role in the maintenance of normal structure and function of the erythrocyte.
How does the structure erythrocytes relate to their function?
The red cell membrane contains approximately equal amounts of lipids and proteins. Membrane lipids are either phospholipids or neutral lipids, mostly unesterified cholesterol. Membrane phospholipids are asymmetrically arranged into a lipid bilayer two molecules thick. Choline phospholipids are more abundant in the extracellular surface whereas amino phospholipids are more concentrated on the inner leaflet of the bilayer. Cholesterol is intercalated between the phospholipid molecules. The relative amounts of cholesterol and phospholipids are responsible for the fluid properties of the erythrocyte membrane. Alterations in the membrane cholesterol-phospholipid ratio result in morphologically abnormal erythrocytes with decreased life span. Membrane proteins are also asymmetrically oriented within the lipid bilayer and can be divided into three functional sets: structural, catalytic and receptor proteins. Sprectrin and actin are the two main structural proteins that together form a submembranous cytoskeletal meshwork that is responsible for the viscoelastic properties of the erythrocyte membrane. Band 3, or the anion channel, is a major transmembranous protein involved in the transport of water and anions and is a carrier of the blood-group-I antigen. Glycophorin A, a sialic-acid-rich glycoprotein, is the major contact or receptor membrane polypeptide that also spans the lipid bilayer. The MN blood group determinants and possibly other biologic receptor sites have been localized on the extracellular portion of glycophorin A. At least 35 to 40 enzymes are confined to the membrane and, undoubtedly, play a vital role in the maintenance of normal structure and function of the erythrocyte.
How do you answer what words can your superior use to describe your work?
Smart Team worker Goal oriented Punctual Detail-oriented Analytical
The plasma membrane contains two kinds of lipids?
Phospholipids. They feature a phosphate group at one end of each molecule. The heads, or phosphate ends, are hydophilic ("water-loving") and the tails are hydrophobic ("water-fearing"), which keeps them oriented correctly, with the tail ends always inside the lipid layer.
