From where did this GOX gene has been isolated from and expressed in transgenic plants?

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#Question id: 4955

#SCPH28 | Zoology

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: 14496

#SCPH01 Biochemistry

4 coins are tossed. Then the probability that at least one head turns up is

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#Question id: 15235

#SCPH01 Biochemistry

During the casting of polyacrylamide gel acrylamide and bis-acrylamide are joined by 

A) Free radical catalysis

B) Polymerisation reaction

C) Dehydration reaction

D) Condensation reaction

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#Question id: 2324

#SCPH06 I Botany

Bacterial DNA is located in:

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#Question id: 13057

#SCPH01 Biochemistry

Precision will be reduced, but yield will be increased

Optimisation of a PCR reaction is often a compromise between the competing demands for precision, efficiency and yield. Although the specific effects may vary, generally, increasing the annealing temperature will increase non-specific primer binding and reduce precision. Increasing the length of the elongation phase will reduce the proportion of incomplete newly-synthesised strands and therefore increase yield. In this case, the potential effect on efficiency is unclear. Increasing the elongation phase would increase the reaction time, but the time taken to ramp down to a lower annealing temperature would be reduced.

How primer concentration leads to decrease in PCR efficiency?