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Origin and Evolution of Life — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYOrigin and Evolution of Life4 Marks
Question
How were complex organic molecules formed during chemical evolution?
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Answer

  1. The primitive broth in which simple organic molecules were suspended, was neutral and free from oxygen.
  2. In this broth polymerisation took place and simple organic molecules aggregated to form new complex organic molecules like polysaccharides, fats, proteins, nucleosides and nucleotides.
  3. Protoproteins were formed by polymerisation of amino acids. These protoproteins later formed proteins.
  4. Formation of protein molecules is considered as landmark in the origin of life. Later the enzymes were formed which accelerated the rate of other chemical reactions.

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