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: 756

#XL - Q Biochemistry

The thermal denaturation of DNA may be reversed by cooling the solution. Rapid cooling allows:

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#Question id: 1576

#XL - S Microbiology

function of Properdin

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#Question id: 5842

#XL - T Zoology

 In homologous recombination in E. coli, the protein that moves along a double-stranded DNA, unwinding the strands ahead of it and degrading them, is:

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#Question id: 10254

#XL - Q Biochemistry

Sucrose is split into its two monosaccharide units—glucose and fructose—which can readily enter the glycolytic pathway. Two pathways for the splitting of sucrose are known in plants, both of which take part in the use of sucrose from phloem unloading; Invertase pathway and sucrose synthase pathway, some statements are given about these pathways, which of the following is incorrect?

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#Question id: 27444

#XL - R Botany

Whittaker’s system of classification does not have__