Study Notes
Cells are the fundamental building blocks of all living organisms, as stated by the cell theory. This theory includes three main principles: all organisms are composed of one or more cells, cells are the smallest units of life, and all cells come from pre-existing cells.
- Cell Theory — a scientific theory that describes the properties of cells. Example: All living organisms are composed of cells.
- Unicellular Organisms — organisms consisting of only one cell that carry out all functions of life. Example: Paramecium.
- Multicellular Organisms — organisms composed of many cells with emergent properties from cellular interactions. Example: Humans.
- Surface Area to Volume Ratio — a concept important in limiting cell size and efficiency. Example: Cells with a larger surface area to volume ratio can exchange materials more efficiently.
- Cell Differentiation — the process by which cells become specialized in structure and function. Example: Red blood cells carrying oxygen.
- Stem Cells — cells with the ability to divide and differentiate into various cell types. Example: Used in therapeutic treatments like Stargardt’s disease.
Exam Tips
Key Definitions to Remember
- Cell Theory
- Unicellular Organisms
- Multicellular Organisms
- Surface Area to Volume Ratio
- Cell Differentiation
- Stem Cells
Common Confusions
- Confusing unicellular organisms with multicellular organisms
- Misunderstanding the importance of surface area to volume ratio
Typical Exam Questions
- What are the three main principles of the cell theory? All organisms are composed of one or more cells, cells are the smallest units of life, and all cells come from pre-existing cells.
- How do unicellular organisms carry out all functions of life? They perform functions like nutrition, metabolism, growth, response, excretion, homeostasis, and reproduction within one cell.
- Why is the surface area to volume ratio important in cells? It affects the efficiency of material exchange and limits cell size.
What Examiners Usually Test
- Understanding of cell theory principles
- Differences between unicellular and multicellular organisms
- Importance and implications of surface area to volume ratio in cells