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A verb in the pluperfect can be either active or passive.

When a verb is in the active form it is translated as 'I had x-ed' in the firs...

1) Crossing over - in Prophase I of meiosis, non-sister chromatids in the same bivalent (i.e. chromatids on separate chromosomes within a homologous pair) can exchange alleles, creating n...

Transcription is the formation of an mRNA molecule from its complementary DNA template.
First the enzyme DNA helicase unwinds the double helix, and the hydrogen bonds between complementary bases brea...

Bond lengths - a single bond is 0.153nm while a double bond is 0.134nm, making Kekulé's model of alternating single and double bonds asymmetric. Other evidence shows benzene to be symmetr...

As the charge of an ion increases, so does its charge density. The ion can therefore form stronger electrostatic forces of attraction, resulting in stronger bonds. As these bonds form to produce a lattice...