Which free-living cells were the earliest contributors to the formation of Earthʹs oxidizing atmosphere?

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#Question id: 6958

#XL - T Zoology

Vg-1 and wnt are used in both frogs and chicks to establish a body axis, although in chicks this is the antero-posterior axis instead of the dorso-ventral axis. What is the region of the chick embryo that is thus analogous to the Nieuwkoop center?

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#Question id: 19937

#XL - P Chemistry

In an atom which has 2K, 8L, 8M and 2N electrons in the ground state, the total number of electrons having =1are

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#Question id: 20189

#XL - P Chemistry

In the Bohr’s orbit, what is the ratio of total kinetic energy and total energy of the electron

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#Question id: 16486

#XL - T Zoology

A technique which has been successfully maintaining  long term culture upto 4-5 months is

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#Question id: 9619

#XL - R Botany

A common ancestor for both species C and E could be at position number