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  4. In the origin of life, microspheres are moot primitive protobiont, which have a membrane of

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Q. In the origin of life, microspheres are moot primitive protobiont, which have a membrane of

Delhi UMET/DPMTDelhi UMET/DPMT 2008Evolution

Solution:

Protobionts are prebiotic chemical aggregates having one or more properties of living systems. Microspheres are small spheroidal biochemical aggregates with covering membrane. Microspheres formed, when a mixture of organic compounds was mixed with cool water. The covering membrane can be of the lipid bilayer if the mixture contains lipids and corresponding to cell membrane. Sidney Fox $(1950)$ heated a dry mixture of ammo acids to $130^{\circ}-180^{\circ}C$ . It formed proteins or polypeptides. The latter were cooled in water. It produced protenoid microspheres of $1-2\, \mu\, m$ diameter which. could grow, constrict and divide.