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Questions and Answers
Which structure separates cells from the external environment?
Which structure separates cells from the external environment?
- Plasma Membrane (correct)
- Mitochondria
- Cytoplasm
- Nucleus
What is the width of the plasma membrane?
What is the width of the plasma membrane?
- 5 to 10 nm (correct)
- 20 to 25 nm
- 15 to 20 nm
- 10 to 15 nm
Who proposed the idea of a lipid bilayer in cellular membranes?
Who proposed the idea of a lipid bilayer in cellular membranes?
- Antonie van Leeuwenhoek
- Rudolf Virchow
- E. Gorter and F. Grendel (correct)
- Robert Hooke
What did E. Gorter and F. Grendel extract the lipid from to study cellular membranes?
What did E. Gorter and F. Grendel extract the lipid from to study cellular membranes?
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What did E. Gorter and F. Grendel measure to calculate the surface area covered by the lipid?
What did E. Gorter and F. Grendel measure to calculate the surface area covered by the lipid?
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Study Notes
Cellular Membranes
- The plasma membrane separates cells from the external environment.
Plasma Membrane Structure
- The plasma membrane is approximately 5-10 nanometers (nm) in width.
Lipid Bilayer Theory
- The idea of a lipid bilayer in cellular membranes was proposed by Gorter and Grendel.
Lipid Extraction and Analysis
- E. Gorter and F. Grendel extracted lipid from red blood cells to study cellular membranes.
- They measured the surface area of monolayers to calculate the surface area covered by the lipid.
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