What is the fundamental structural and functional unit of life?
The cell.
What distinguishes a eukaryotic cell from a prokaryotic cell?
Eukaryotic cells have a nucleus; prokaryotic cells do not.
What percentage of the plasma membrane is composed of proteins?
49% of the plasma membrane is proteins.
What is the structure of the plasma membrane's phospholipid bilayer?
It is a double layer of amphiphilic phospholipids with hydrophilic heads and hydrophobic parts.
Cell's fundamental unit
The smallest unit capable of life
Cell membrane function
Controls exchanges between cell and environment
Eukaryotic cell characteristic
Has a nucleus; can be unicellular or multicellular
Prokaryotic cell feature
Lacks a nucleus, e.g., bacteria
Plasma membrane composition
Lipid bilayer with proteins and carbohydrates
Membrane proteins roles
Receptors, enzymes, transporters, channels
Water movement in osmosis
Flows from hypotonic to hypertonic environments
Test your knowledge with 11 questions on Living Biology and Cell Function.
1. Which composition most accurately represents the major components of the plasma membrane?
2. How are phospholipids arranged in the plasma membrane between two aqueous environments?
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