IB Biology - The Origins of Cell
Chapter 1.5 - The origins of cell
Cells can only be formed by division of pre-existing cells.
The first cells must have arisen from non-living material.
The origin of eukaryotic cells can be explained by the endosymbiotic theory.
Application: Evidence from Pasteur’s experiments that spontaneous generation of cells and organisms does not now occur on Earth.
Students should be aware that the 64 codons in the genetic code have the same meanings in nearly all organisms, but that there are some minor variations that are likely to have accrued since the common origin of life on Earth.
Revision of The Cell Theroy
Louis Pasteur and His Experiment
The Origin of Cell
The Endosymbiotic Theory
Endosymbiotic Theory = eukaryote is formed when the large prokaryote engulfed the small prokaryotes
Why did scientist believe mitochondria and chloroplast formerly are prokaryotes?
Arguments of the theory
The theory faced criticism and challenges:
In this IB Biology topic, you have to understand
That is the end of the topic
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Written by Queenie l IBDP Biology Specialist @ TUTTEE
Photo References:1. Wnycstudios, https://www.wnycstudios.org/podcasts/undiscovered/episodes/spontaneous-generation
2. Explore Biochemistry World, https://explorebiochemistryworld.wordpress.com/2013/02/03/the-endosymbiotic-theory/
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