If relatively small carbonaceous chondrites from space were a significant source of Earthʹs original amino acids, then which two of these would have been most important in permitting their organic materials to survive impact with Earth?

I. Carbonaceous chondrites must contain no D-amino acids.

II. Earthʹs early atmosphere must have had little free oxygen.

III. The chondrites must have arrived on Earth before 4.2 billion years ago.

IV. Earthʹs early atmosphere must have been dense enough to dramatically slow the chondrites before they impacted.

V. The chondrites must have impacted land, rather than a large body of water.

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#Question id: 16493

#SCPH01 Biochemistry

35S promoter sequences derived from cauliflower mosaic virus shows which type of expression.

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#Question id: 15196

#SCPH06 I Botany

In the following pedigree shows the segregation of two different recessive traits.

Derive a general equation relating the probability that the child will have both traits expressed as a function of the distance between the markers in cM.

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#Question id: 3472

#SCPH28 | Zoology

Which of the following is incorrect statement?

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#Question id: 1755

#SCPH05 I Biotechnology

Prior to class switching, B-cells express:

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#Question id: 3660

#SCPH01 Biochemistry

Which of the following is true for exchange of homologous regions between two DNA molecules?