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This question comes up often in GCSE papers and is a key topic when talking about exchange or cell biology. 
Active transport comes hand in hand with diffusion and osmosis. It is a key mechanism for ...

In spermatogenesis, germline epithelium in the seminiferous tubules of the testes divides by mitosis and then a period of cell growth occurs, changing them from spermatogonia to primary spermatocytes. The...

Broadly speaking, the main function of the kidneys is to filter out waste from the body and excrete it out in the urine. Excretion is the removal of waste (i.e. products of metabolism/ toxic products like...

DNA helicase breaks the hydrogen bonds between DNA strands, separating the double-stranded DNA into single strands and exposing the nucleotide bases.DNA polymerase joins adjacent DNA nucleotides through f...

-An action potential arrives at the presynaptic membrane-Ca²⁺ ion channels open-Ca²⁺ ions diffues into presynaptic knob-Acetylcholine/ neurotransmitter in vesicles-Vesicles move towa...