Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earthʹs atmosphere?

1.  the relatively short time between intense meteor bombardment and appearance of the first life forms

2.  the lack of experimental evidence that organic monomers can form by abiotic synthesis

3.  Uncertainty about which gases comprised early Earthʹs atmosphere

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#Question id: 20196

#XL - P Chemistry

Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is

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#Question id: 19669

#XL - P Chemistry

The conversion of trialkyl borane to an alcohol does not require which of the following?

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#Question id: 19588

#XL - P Chemistry

Which of the following is not a lanthanide property?

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#Question id: 2394

#XL - Q Biochemistry

Cyanide binds with at least one molecule involved in producing ATP. If a cell is exposed to cyanide, most of the bound cyanide is likely to be localized within the ________.

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#Question id: 11580

#XL - T Zoology

Melatonin is secreted by the ________.