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A mutation in the DNA sequence may lead to a different amino acid sequence may lead to a different amino acid being produced in the primary protein structure of the enzyme during translation. This may cau...

The increased pressure caused by the stimulus opens pressure gated sodium ion channels allowing Na+ ions to diffuse (down a concentration gradient) into the axon. This sudden influx of Na+ ions causes a l...

Firstly the resting membrane is set by Na+/K+ ATPase so that 3 Na+ moves out for every 2K+ that moves in; this creates a negative membrane potential of around -65mV. To initiate an action potential the me...

Mitosis is the seperation of DNA. There are 4 stages of mitosis that you need to be aware of for A level Biology: Prophase, Metahase, Anaphase and Telophase. (I like to remember this order as P.Mat)

This question is asking you to explain how action potentials travel across neuromuscular junctions and how the closure of calcium ion channels would prevent the signal travelling across the junction, so w...