First cell produced on earth is:

MCQ

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Answer

Explanation:

First cells produced were simple aggregates of organic compounds, called protobionts, which are thought to be precursors of prokaryotes.

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Reason : Lamarck's theory of evolution is popularly called theory of continuity of germ plasm.

$I.$ Human insulin is made-up of $51$ amino acidsarranged in two polyperptide chains.

$II.$ The two polypeptide chains are interconnected by two disulphide bridges.

$III.$ In mammals including humans, insulin is synthesised as a pro-hormone, which contains an extra stretch called the $C$ -peptide.

$IV.$ $C$ -peptide is not present in the mature insulin

Which of the statements given above are correct?