Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

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#Id: 8320

#XL - Q Biochemistry

The lag phase can be reduced or abolished entirely by adding premade nuclei.

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#Id: 9277

#XL - R Botany

Nod factor is b-1,4-linked N-acetyl-D-glucosamine backbone

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#XL - R Botany

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#Id: 9452

#XL - T Zoology

In cytokine receptors, 

the receptor and kinase are separate polypeptides, encoded by different genes, yet are bound tightly together.

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#Id: 7893

#XL - Q Biochemistry

A human cell has about 1000–2000 mtDNA molecules

A human egg has about 500,000 mtDNA molecules

A sperm has only about 100 mtDNA molecules