Podcast
Questions and Answers
Which of the following best describes the arrangement of phospholipids in a cell membrane?
Which of the following best describes the arrangement of phospholipids in a cell membrane?
- A single layer with hydrophilic heads facing outward.
- A bilayer with hydrophobic tails facing outward and hydrophilic heads facing inward.
- A bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward. (correct)
- A single layer with hydrophobic tails facing outward.
What property of triglyceride molecules makes them insoluble in water?
What property of triglyceride molecules makes them insoluble in water?
- Their high charge.
- Their non-polar nature. (correct)
- Their polar phosphate group.
- Their hydrophilic glycerol component.
Why is the phosphate group bonded to glycerol considered polar and hydrophilic in a phospholipid?
Why is the phosphate group bonded to glycerol considered polar and hydrophilic in a phospholipid?
- It's highly charged (correct)
- It contains fatty acid tails.
- It repels water.
- It is uncharged.
According to the fluid mosaic model, what is the role of phospholipids in the cell surface membrane?
According to the fluid mosaic model, what is the role of phospholipids in the cell surface membrane?
Which of the following is a primary function of the cell membrane?
Which of the following is a primary function of the cell membrane?
In a phospholipid bilayer, which region primarily interacts with the aqueous environment inside and outside the cell?
In a phospholipid bilayer, which region primarily interacts with the aqueous environment inside and outside the cell?
Besides acting as a barrier, what other crucial function does the cell membrane perform?
Besides acting as a barrier, what other crucial function does the cell membrane perform?
How does the structure of the phospholipid bilayer contribute to its function as a selective barrier?
How does the structure of the phospholipid bilayer contribute to its function as a selective barrier?
What is the significance of the phospholipid bilayer being the basis of all cell membranes?
What is the significance of the phospholipid bilayer being the basis of all cell membranes?
How do phospholipids arrange themselves in an aqueous solution to form a bilayer?
How do phospholipids arrange themselves in an aqueous solution to form a bilayer?
Flashcards
Triglycerides
Triglycerides
Lipids with a glycerol molecule bonded to three fatty acids; they are non-polar and hydrophobic (insoluble in water).
Phospholipids
Phospholipids
Lipids with a phosphate group bonded to glycerol; highly charged, making them polar and hydrophilic.
Phospholipid Bilayer
Phospholipid Bilayer
Structure formed by phospholipids in water, where hydrophilic heads interact with water and hydrophobic tails move away.
Fluid Mosaic Model
Fluid Mosaic Model
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Membrane Function
Membrane Function
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Cell Signalling
Cell Signalling
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Study Notes
- Describes the role of phospholipids in membranes
- Describes the fluid-mosaic model of the cell surface membrane
Triglycerides
- Triglyceride molecules are non-polar, making them hydrophobic and insoluble in water
Phospholipids
- Contain a phosphate group bonded to glycerol that is highly charged, making it polar and hydrophilic
Phospholipid Bilayer
- The hydrophilic head interacts with water
- The fatty acid tail is hydrophobic and buries itself away from the water
- This structure is a phospholipid bilayer
- It is the basis of all cell membranes
Membrane Functions
- Acts as a barrier between internal contents of cells versus the external environment, or contents of an organelle and cytoplasm
- Cell signalling
- Location for chemical reactions
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