A pure culture in exponential growth phase has a bacterial concentration of 6.4 x 10^8 cells/ml. If the bacterium has a generation time of 1 h, how long ago was the cell concentration 8.0 x 10^7 cells/ml?

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#Question id: 20033

#XL - P Chemistry

The mass of one mole of electron is

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#Question id: 386

#XL - S Microbiology

Which of the following properties of water does not contribute to the fitness of the aqueous environment for living organisms?

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#Question id: 19946

#XL - P Chemistry

If the value of azimuthal quantum number of an electron is 2, then which of the following values of magnetic quantum numbers is not permissible,

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#Question id: 4649

#XL - S Microbiology

Which statement best describes the evolution of pesticide resistance in a population of insects?

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#Question id: 11737

#XL - R Botany

Cytokinins have been shown to have effects on many physiological and developmental processes, including____

a) Leaf senescence

b) Apical dominance

c) Gametophytic  development

d) Vascular development

e) Breaking of bud dormancy

f) Causing bud dormancy