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Earn 100

Which of the following mixture of gases was used by Miller in his experiment?
(a)Methane, ammonia, hydrogen and carbon monoxide.
(b)Ammonia, water, carbon dioxide and oxygen.
(c)Methane, water, oxides of nitrogen and oxygen.
(d)Methane, ammonia, hydrogen and water vapour.

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Important Questions on Evolution
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(i) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(ii) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?

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Assertion (A): There is a sufficient reason to believe that first cells on the planet lived in an atmosphere lacking oxygen.
Reason (R): Thus even all living organisms retain the enzymatic mechanism to completely oxidise glucose without the help of oxygen.
The correct option among the following is:

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(i) Formation of protobionts
(ii) Synthesis of organic monomers
(iii) Synthesis of organic polymers
(iv) Formation of DNA-based genetic systems

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