AQA A Level Biology复习笔记2.1.1 The Cell Theory
The Cell Theory
- Until microscopes became powerful enough to view individual cells, no-one knew for certain what living organisms were made from
- A scientist called Robert Hooke is thought to be the first person to view cells (including single-celled microorganisms) and Hooke also came up with the term "cells" to describe these newly discovered structures
- Matthias Schleiden and Theodor Schwann were two other scientists who studied animal and plant cells
- In 1837, they came up with the idea that all living organisms are made of cells
- This idea is known as ‘cell theory’
- The cell theory is a unifying concept in biology (it is universally accepted)
- The cell theory includes three main ideas:
- All living organisms are made up of one or more cells
- Cells are the basic functional unit (i.e. the basic unit of structure and organisation) in living organisms
- New cells are produced from pre-existing cells
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