Nitrogen (N) normally forms three covalent bonds with a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). What do you predict to be the charge on ammonium?

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#Question id: 15528

#XL - S Microbiology

The B7 family of protein interact  with distinct receptor present on the T-cells, 

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#Question id: 7452

#General Aptitude

What will be the angle between the hour and minute hands at 3 : 20 ?

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#Question id: 1086

#XL - Q Biochemistry

What is the most likely mechanism by which testosterone functions inside a cell?

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#Question id: 19953

#XL - P Chemistry

The line spectrum ot two elements is not identical because .

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#Question id: 447

#XL - S Microbiology

In glycolysis, fructose 1,6-bisphosphate is converted to two products with a standard free-energy change (DG'°) of 23.8 kJ/mol.  Under what conditions encountered in a normal cell will the free-energy change (DG) be negative, enabling the reaction to proceed spontaneously to the right?