Learn: Cell Biology

Welcome!Today we'll learn about Cell Biology, an essential topic in AQA GCSE Biology. We'll explore cell structure, function, division, and transport. Let's dive in!

What are cells?Cells are the building blocks of all living organisms. They carry out essential processes that keep organisms alive. There are two main types: prokaryotic cells (simple cells like bacteria) and eukaryotic cells (complex cells like animal and plant cells).

MicroscopyMicroscopes allow us to see cells and their structures, which are often too small to see with the naked eye. There are two types: light microscopes (use light) and electron microscopes (use electrons, with higher magnification and resolution).

Cell StructureCells have different parts called organelles, which each have a specific function. In animal cells, key organelles include the nucleus (controls cell activities), cytoplasm (where chemical reactions occur), and mitochondria (release energy during respiration).

Cell DivisionCells divide by a process called mitosis, which produces two identical daughter cells. Mitosis is essential for growth, repair, and replacing damaged cells.

Transport MechanismsCells exchange substances with their environment through diffusion (movement of particles from high to low concentration), osmosis (movement of water through a semi-permeable membrane), and active transport (movement of substances against a concentration gradient, requiring energy).

Review Time!Great job learning about cell biology! Let's test your understanding with a few review questions.