A covalent bond is a chemical bond that occurs when two or more atoms share electrons. The sharing of electrons helps complete the outer shell, or valence shell, of both atoms. The sharing of electrons creates a stable balance of attractive and repulsive forces between atoms.

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#Id: 9819

#XL - R Botany

Arabidopsis seeds can be induced to germinate with red light in the range of 0.001 to 0.1 μmol m–2 at very-low-fluence responses (VLFRs).

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#Id: 9083

#XL - T Zoology

Cholera toxin, secreted by Vibrio cholerae in the intestine of an infected person, is a heterodimeric protein (AB). 

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#Id: 4311

#XL - T Zoology

Hitchhiking: Change in the frequency of an allele due to linkage with a selected allele at another locus.

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#Id: 7846

#XL - T Zoology

When the anomeric hydroxyl of a D-hexose is on the same side of the ring as C-6, the structure is β a by definition; when it is on the opposite side from C-6, the structure is α.

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#Id: 8173

#XL - Q Biochemistry