The ratio of energy of the electron in ground state of hydrogen to the electron in first excited state of Be⁺³ is

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#Question id: 4628

#XL - T Zoology

Which group is composed entirely of individuals who maintained that species are fixed (i.e., unchanging)?

A) Linnaeus

B) Lyell

C) Darwin

D) Aristotle

E) Cuvier

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#Question id: 3030

#XL - S Microbiology

Which of the following features of prokaryotic biology involves metabolic cooperation among cells?

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#Question id: 19630

#XL - P Chemistry

Which of the following is the weakest base?

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#Question id: 19601

#XL - P Chemistry

What is the entropy change (in JK-1 mol-1) when 1 mole of ice is converted into water at 0℃? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol-1 at 0℃)

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#Question id: 18231

#XL - S Microbiology

A DNA sample having mass 1 picogram undergoes PCR, the eluted DNA is weighted about 1 microgram, the minimum number of cycles required