What are the constituents used for isolation of bacterial plasmid DNA, RNA and plant DNA respectively?

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#Question id: 4593

#XL - S Microbiology

Which of Darwin's ideas had the strongest connection to his reading of Malthus's essay on human population growth?

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#Question id: 359

#XL - S Microbiology

What is the concentration of OH− in a solution with an H+ concentration of 1.3 × 10^−4 M?

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#Question id: 8924

#XL - R Botany

Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?

1. Protostomes invade terrestrial environments.

2. Cambrian explosion occurs.

3. Deuterostomes invade terrestrial environments.

4. Vertebrates become top predators in the seas.

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#Question id: 9608

#XL - S Microbiology

Darwin analogized the effects of evolution as the above-ground portion of a many-branched tree, with extant species being the tips of the twigs. The common ancestor of two species is most analogous to which anatomical tree part?

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#Question id: 4562

#XL - S Microbiology

Which stratum should contain the greatest proportion of extinct organisms?