The wavelength of radiation emitted when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1·09 × 10⁷m^–1)

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#Question id: 1764

#XL - Q Biochemistry

Which of the following is NOT a feature of germinal center B-cells?

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#Question id: 8927

#XL - R Botany

Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that

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#Question id: 4989

#XL - S Microbiology

If the malesʹ halteres have species-specific size, shape, color, and use in courtship displays, and if the speciesʹ ranges overlap, then the speciation events may have been driven, at least in part, by which of the following?

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#Question id: 16479

#XL - T Zoology

Organotypic cultures are type of cultures which

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#Question id: 365

#XL - Q Biochemistry

Water is a polar molecule: the oxygen atom with its unshared electrons carries a partial negative charge (δ−) of ___________, and the hydrogen atoms each carry a partial positive charge (δ+) of __________, where e is the charge of the electron.