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Calcium ions enter the presynaptic terminal via voltage gated calcium channels, once the presynaptic terminal is depolarised by an action potential.Calcium ions stimulate vesicles to fuse with the presyna...

velocity = frequency x wavelengthvelocity = 50 * 0.40velocity = 20 m/svelocity = distance / timetime = distance / velocitytime = 100 / 20time = 5sAnswer is 5s.

^A_Z X --> ^{A - 4}_{z - 2}Y + ⁴₂α
During alpha-decay, the nuclus emits an alpha particle which consists of two protons and two neut...

Where the angles of a triangle A+B+C = 180 degrees, then if follows that (where A = 90, B = 2x + 30, C = 2x):180 = 90 + 2x + 30 + 2x180 = 120 + 4x60 = 4x15 = xTherefore, it follows that A = 90, B = 60, C ...

Interphase: DNA in chromosomes replicates to have double copies of itself for mitosis. 1. Prophase: DNA in chromosomes condenses therefore becomes mo...