Summary
Cells are the basic unit of life, forming the structure and function of all living organisms. Animal and plant cells have similarities and differences in their structures and functions.
- Nucleus — controls all activities in the cell and contains genetic information. Example: The nucleus in an animal cell directs cell functions and passes on genetic traits.
- Cytoplasm — jelly-like substance where cell activities take place. Example: Cytoplasm in both animal and plant cells is where chemical reactions occur.
- Cell Membrane — controls movement of substances in and out of the cell. Example: The cell membrane in an animal cell regulates entry and exit of materials.
- Cell Wall — supports and gives the plant cell its shape. Example: The cell wall in a plant cell provides rigidity and structure.
- Chloroplast — contains chlorophyll which traps sunlight to make food during photosynthesis. Example: Chloroplasts in plant cells are essential for converting sunlight into energy.
Exam Tips
Key Definitions to Remember
- Nucleus: Controls cell activities and contains genetic information.
- Cytoplasm: Jelly-like substance where cell activities occur.
- Cell Membrane: Regulates movement of substances in and out of the cell.
- Cell Wall: Provides support and shape to plant cells.
- Chloroplast: Contains chlorophyll for photosynthesis.
Common Confusions
- Confusing the roles of the cell membrane and cell wall.
- Mixing up the functions of chloroplasts and cytoplasm.
Typical Exam Questions
- What is the function of the nucleus in a cell? It controls cell activities and contains genetic information.
- How does the cell membrane differ from the cell wall? The cell membrane regulates entry and exit of substances, while the cell wall provides structure.
- Why are chloroplasts important in plant cells? They contain chlorophyll for photosynthesis, converting sunlight into energy.
What Examiners Usually Test
- Differences between animal and plant cells.
- Functions of different cell organelles.