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DNA helicase separates the strands by breaking the hydrogen bonds.One of the strands is used as a template to transcribe the mRNA.(Complementary) base pairing occurs with free RNA nucleotides.A→U, T→A, C→G, ...

Binding the first oxygen molecule leads to a change in the tertiary structure of haemoglobin This uncovers the second haem binding site for another oxygen molecule to attach

When the action potential reaches the presynaptic knob , it causes calcium ion protein channels to open and calcium ions enter the presynaptic knob by facilitated diffusion .The increased concentration of th...

Pressure causes the membrane to become deformed/stretched.2) Sodium ion channels open - diffuse in3) Greater pressure = more channels open, greater potential difference change4) Threshold potential reached, ...

A non competitive inhibitor has a different shape to the substrate molecule.The inhibitor binds to an allosteric site.This causes a conformational change meaning the substrate is no longer able to bind to th...