Which event is nearest in time to the end of the period known as snowball Earth?

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#Question id: 49

#Unit 1. Molecules and their Interaction Relevant to Biology

The equilibrium constant, Keq, for the following reaction is 2 × 105 M: If the measured cellular concentrations are [ATP] = 5 mM, [ADP] = 0.5 mM, and [Pi] = 5 mM, on the basis of the above information calculate the Keq in living cells?

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#Question id: 13084

#Unit 13. Methods in Biology

Statement: In a modified version of AFLP, the selection of fragments using biotin-streptavidin binding is avoided.

Explanations: I. The fragments are ligated to the appropriate adapters and used for PCR amplification using two AFLP primers, each primer having a single selection nucleotide; this is called preamplification step.

II. The PCR products from this preamplificated step are diluted and used as template for second PCR amplification.

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#Question id: 551

#Unit 1. Molecules and their Interaction Relevant to Biology

Enzymes differ from other catalysts in that only enzymes:

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#Question id: 29090

#Unit 10. Ecological Principles

The figure above shows the distribution of 10 plant species that grow along a regular environmental gradient, such as depth of the water table in a river valley. All other environmental factors are similar. This figure demonstrates that

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#Question id: 31174

#Unit 7. System Physiology – Animal

Excitatory postsynaptic potential (EPSP) is produced by: