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Questions and Answers
What is the main component of the membrane?
What is the main component of the membrane?
- Phospholipids (correct)
- Proteins
- Lipid bilayers
- Cholesterol
What type of bonds are found in plasmalogens?
What type of bonds are found in plasmalogens?
- Ether linkage (correct)
- Ester linkage
- Hydrogen bonding
- Hydrophobic interactions
What are the three components of a membrane?
What are the three components of a membrane?
- Phospholipids, proteins, and fatty acids
- Proteins, lipids, and carbohydrates
- Phospholipids, proteins, and glycoproteins
- Phospholipids, proteins, and lipid bilayers (correct)
What type of molecule is used to regulate tonicity?
What type of molecule is used to regulate tonicity?
What is the role of membrane lipids in the membrane?
What is the role of membrane lipids in the membrane?
What type of fatty acid is attached to phospholipids?
What type of fatty acid is attached to phospholipids?
What is the main role of the membrane?
What is the main role of the membrane?
What type of membrane proteins pass through the membrane multiple times?
What type of membrane proteins pass through the membrane multiple times?
What type of proteins interact with the membrane?
What type of proteins interact with the membrane?
What type of membrane lipid is found in the exoplasmic face of the plasma membrane?
What type of membrane lipid is found in the exoplasmic face of the plasma membrane?
What type of molecule is amphipathic?
What type of molecule is amphipathic?
How many plasma membranes are found in prokaryotic cells?
How many plasma membranes are found in prokaryotic cells?
What is the effect of sphingolipids and cholesterol on membrane fluidity?
What is the effect of sphingolipids and cholesterol on membrane fluidity?
What are the two components of lipids?
What are the two components of lipids?
What type of fatty acids are found in phospholipids?
What type of fatty acids are found in phospholipids?
Which of the following is true about membrane fluidity?
Which of the following is true about membrane fluidity?
Flashcards
Membrane main component
Membrane main component
Phospholipids are the primary building blocks of cell membranes.
Plasmalogens bond type
Plasmalogens bond type
Plasmalogens contain ether linkages instead of ester bonds.
Membrane's 3 components
Membrane's 3 components
Cell membranes consist of phospholipids, proteins, and lipid bilayers.
Tonicity regulator
Tonicity regulator
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Membrane lipid role
Membrane lipid role
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Phospholipid fatty acid
Phospholipid fatty acid
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Membrane's main role
Membrane's main role
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Multipass membrane protein
Multipass membrane protein
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Membrane interacting protein
Membrane interacting protein
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Exoplasmic membrane lipid
Exoplasmic membrane lipid
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Amphipathic molecule
Amphipathic molecule
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Prokaryotic membrane count
Prokaryotic membrane count
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Sphingolipids and cholesterol effect
Sphingolipids and cholesterol effect
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Lipid components
Lipid components
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Phospholipid fatty acid type
Phospholipid fatty acid type
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Study Notes
- All cells have a membrane that is essential for their function.
- Prokaryotic cells have a single plasma membrane, while eukaryotic cells have many membrane-covered cell organelles.
- The membrane is made of phospholipids that spontaneously form bilayers.
- Each lipid layer is called a leaflet.
- The bilayer is embedded with many types of proteins.
- The membrane is selectively-permeable and provides stability to the cell.
- The cell maintains tonicity by regulating the levels of water inside and outside of the cell.
- Membrane lipids are amphipathic and are composed of two segments with very different chemical properties.
- Phosphoglycerides have various head group attachments to the phosphate group, while sphingolipids have a single fatty acid attached by an ether linkage.
- Fatty acids of phospholipids are long chains of hydrocarbons with various degrees of saturation.
- Plasmalogens have one fatty acid attached by an ether linkage and one by an ester linkage.
- Membranes are conserved across different cells and are composed of phospholipids, proteins, and lipid bilayers.
- Membrane lipids play an important role in determining the physical properties of membranes.
- Membrane fluidity decreases with the presence of sphingolipids and cholesterol, while it increases with the presence of phosphoglycerides.
- Membrane lipid distribution is asymmetrical between exoplasmic and cytoplasmic leaflets, with cholesterol being fairly evenly distributed.
- Membrane proteins interact with membranes in three ways: transmembrane proteins pass through the membrane once, multipass membrane proteins pass through the membrane multiple times, and glycoproteins and glycolipids are only found in the exoplasmic face of the plasma membrane.
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