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IB Biology Higher Level Summary Notes 1.5 £3.86   Add to cart

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IB Biology Higher Level Summary Notes 1.5

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CELL BIOLOGY - I scored a Level 7 on my final exam using these notes. Introduction to cells - Ultrastructure of cells - Membrane structure - Membrane transport - The origin of cells - Cell division

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  • September 6, 2021
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1.5 Revision notes
THE ORIGIN OF CELLS

Cells can only arise from other cells
Pasteur: Biogenesis / Spontaneous generation




- Cell is complex structure, no natural mechanism is able to produce
- Increasing cell population requires cell division
- Viruses are produced from simpler subunits, but they do not consist of cells, can only be
produced in host cells


The first cells must have arisen from non-living material
Abiogenesis
- Production of carbon compounds (amino acids & sugars)
- Assembly of carbon compounds into polymers
o Polymers developed ability to replicate
o Enabling inheritance (through DNA)
- Formation of membrane
o Phospholipids naturally form membrane bilayer
o Allowed different internal chemistry to form

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