Study Notes
Cells are the basic building blocks of all living things, providing structure, taking in nutrients, converting them into energy, and carrying out specialized functions. Specialized cells in animals and plants have unique structures to perform specific roles.
- Cell — the basic unit of life in all living organisms.
Example: Human body cells. - Nucleus — serves as the cell's command center, housing DNA.
Example: Found in both animal and plant cells. - Plasma membrane — the outer lining of the cell that regulates entry and exit of materials.
Example: Present in both animal and plant cells. - Cytoplasm — jelly-like fluid inside the cell where organelles are suspended.
Example: Found in all cells. - Mitochondria — organelles that convert energy from food into usable cell energy.
Example: Present in both animal and plant cells. - Cell wall — a rigid layer providing structural support and protection, found outside the cell membrane.
Example: Present only in plant cells. - Chloroplast — organelle where photosynthesis occurs, containing chlorophyll.
Example: Found in plant cells. - Red blood cells — specialized cells that carry oxygen throughout the body.
Example: Found in animal blood. - Ciliated cells — cells with tiny hairs that move mucus and particles out of airways.
Example: Found in the respiratory tract. - Root hair cells — specialized plant cells that absorb water and minerals from the soil.
Example: Found on plant roots.
Exam Tips
Key Definitions to Remember
- Cell
- Nucleus
- Plasma membrane
- Cytoplasm
- Mitochondria
- Cell wall
- Chloroplast
- Red blood cells
- Ciliated cells
- Root hair cells
Common Confusions
- Confusing the functions of the nucleus and mitochondria
- Mixing up the roles of cell wall and plasma membrane
- Thinking chloroplasts are present in animal cells
Typical Exam Questions
- What is the function of the nucleus in a cell? It serves as the command center and houses DNA.
- How do red blood cells carry oxygen? They contain hemoglobin and have a biconcave shape for maximum oxygen absorption.
- What is the role of chloroplasts in plant cells? They conduct photosynthesis using chlorophyll.
What Examiners Usually Test
- Differences between animal and plant cells
- Functions of specialized cells
- Identification and roles of cell organelles