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: 1022

#SCPH06 I Botany

Why are we concerned at all with monitoring emerging/reemerging diseases?

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#Question id: 13106

#SCPH01 Biochemistry

With the help of DNA fingerprinting which can be used to determine paternity. There are three babies (Baby A, Baby B and Baby C) in a maternity ward, and three sets of confused and worried parents. (Father and Mother #1 are a couple, as are Father and Mother #2, and Father and Mother #3.) 

You do each PCR reaction on chromosome 15 and load each one into a separate well of an agarose gel, and then run the gel.

 

 

Why is it that some people only have one band?

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#Question id: 3556

#SCPH01 Biochemistry

Flower color in plant follows incomplete dominance. Cross between AA and aa results all F1 offspring are uniform were allowed to cross with AA genotype. What will be phenotype ratio?

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#Question id: 1752

#SCPH01 Biochemistry

Dendritic cells can be driven from a resting state to an activated state by the T-cell surface molecule:

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#Question id: 8916

#SCPH05 I Biotechnology

What do animals as diverse as corals and monkeys have in common?