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Receptor-mediated Endocytosis

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The microscopic anatomy of the liver is a complex and intricate system that comprises numerous structural units known as liver lobules, each of which is comparable in size to a sesame seed. These hexagonal structures consist of plates of liver cells or hepatocytes, which are characterized by their versatility and abundance of cellular apparatus like rough and smooth ER, Golgi apparatus, peroxisomes, and mitochondria.
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Evolution of cell and chromosome structure in eukaryote.

A K Sharma

    Acta Biotheoretica
    |January 1, 1986
    PubMed
    Summary

    Eukaryotic chromosomes, with splicing, emerged early in evolution, potentially alongside prokaryotes. This new concept explains the origin of complex eukaryotic cells, organelles, and the rapid diversification of life forms.

    Area of Science:

    • Evolutionary Biology
    • Molecular Evolution
    • Genetics

    Background:

    • The evolutionary timeline of eukaryotic chromosome development remains a key area of research.
    • Understanding the origin of eukaryotic cells and their complex genetic structures is crucial.

    Purpose of the Study:

    • To propose a new concept for the early evolution of eukaryotic chromosomes.
    • To explain the integration of organelles and the diversification of eukaryotic life.

    Main Methods:

    • Analysis of available evolutionary and genetic data.
    • Theoretical modeling of gene transfer and cellular evolution.

    Main Results:

    • Eukaryotic chromosomes with splicing likely evolved early, possibly in parallel with prokaryotes.

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  • The endosymbiotic theory is integrated with nuclear gene transfer to explain organelle function.
  • This framework accounts for the rapid emergence of eukaryotic forms and fossils.

    • Conclusions:

    • A novel concept posits early, parallel evolution of eukaryotic chromosomes.
    • This model integrates endosymbiosis and gene transfer to explain eukaryotic complexity.
    • The theory addresses the sudden appearance of diverse eukaryotic fossils in the early Paleozoic.