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Which of the following existed early in the evolution process?
A. Porphyrin dependent respiration
B. Formation of macromolecules
C. Porphyrin dependent photosynthesis
D. All of the above

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Last updated date: 18th Jun 2024
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Answer
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Hint: Evolution is the orderly change of one form to another form. The process of evolution started with the origin of the universe and the origin of life. The universe originated with a single huge explosion that is known as the Big Bang.

Complete answer: The first step in the origin of life is the formation of the various chemicals required to form and sustain life that is known as chemogenesis. The primitive atmosphere of the Earth which was reducing in nature was made up of water vapor, carbon dioxide, hydrogen, and nitrogen. These simple compounds formed macromolecules like fats, carbohydrates, proteins, nucleotides, etc.
-Porphyrin dependent respiration: Porphyrin or substituted porphyrin ring is a ring having four pyrrole rings which are interconnected together. In the case of haemoglobin, the porphyrin ring is connected by the central iron atom. This haemoglobin is found in the blood of advanced animals and it acts as an oxygen carrier. The porphyrin ring having the central magnesium atom found in plants is known as the chlorophyll. Chlorophyll helps in photosynthesis. Hence, this statement is incorrect. Moreover, plants and animals evolved very late during evolution.
Porphyrin dependent photosynthesis: In the case of plants, the chlorophyll contains the porphyrin ring having the central magnesium atom. Chlorophyll helps in photosynthesis. Hence, this statement is incorrect. Moreover, plants evolved very late during evolution. Thus, based on the above information we can conclude that the Formation of macromolecules existed early in the evolution process.
Hence, the correct answer is option (B).

Note: The inorganic compounds that were formed during the chemogenesis were known as the primitive gases. These primitive gases reacted with each other in the presence of ultraviolet light, high temperatures, and lightning and formed simple inorganic elements like water, methane, ammonia, and cyanide. These simple elements are washed from the atmosphere to the earth’s surface and oceans via rail. Here condensation and polymerization of these molecules led to the formation of simple organic compounds or macromolecules.