Cell Biology - Structure and Function Cheat Sheet

Key Definitions

• Cell: Basic unit of life, composed of cytoplasm and a nucleus enclosed in a membrane.

• Prokaryotic Cell: Simple, unicellular organism without a nucleus (e.g., bacteria).

• Eukaryotic Cell: Complex cell with a nucleus and organelles (e.g., plant and animal cells).

• Organelle: Specialized structure within a cell that performs a specific function.

Important Concepts

Cell Types

• Prokaryotic Cells: Lack membrane-bound organelles, smaller in size.

• Eukaryotic Cells: Have membrane-bound organelles, larger and more complex.

Cell Organelles

• Nucleus: Control center, contains DNA.

• Mitochondria: Powerhouse of the cell, site of ATP production.

• Ribosomes: Protein synthesis; can be free-floating or attached to the ER.

• Endoplasmic Reticulum (ER):

• Rough ER: Studded with ribosomes, synthesizes proteins.

• Smooth ER: Lacks ribosomes, synthesizes lipids.

• Golgi Apparatus: Modifies, sorts, and packages proteins and lipids.

Key Formulas

• a: length of one side of the cube

• Volume = a^3: total space occupied by the cube

Common Mistakes to Avoid

Common Mistake: Confusing plant and animal cell organelles (e.g., chloroplasts vs. mitochondria).

Memory Tricks

Tip: "Nuclear Mitochondria Are Really Good" —

- Nucleus

- Mitochondria

- Apparatus (Golgi)

- Ribosomes

- Golgi Apparatus

Key Diagrams

   +------------------+
   |      Nucleus     |
   |   +----------+   |
   |   |  DNA     |   |
   |   +----------+   |
   +--------|---------+
            |
   +--------|---------+
   |   Mitochondria   |
   |   (ATP Maker)    |
   +------------------+

Tip: Remember organelle functions with the mnemonic "NMR GERS" (Nucleus, Mitochondria, Ribosomes, Golgi, ER, Smooth, Rough).