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DEFINE: Key words What is a junction, what is a neurone and what is the nervous system? So, the nervous system connects all the nerve cells and fibres which transmit nerve impulses from one part of the bo...

Firstly you have a change away from optimum conditions, for instance a decrease in internal body temperature, which is detected by a receptor. The receptor relays this infromation down the communication p...

After the mRNA has exited the nucleus through the nuclear pores. Translation begins with the mRNA entering the ribosome. Next tRNA uses its three unpaired bases to bond with a specific amino and bring it ...

Describe: As the pH decreases below the optimum, enzyme activity also decreases. Explain: As pH decreases, the concentration of hydrogen ions increases (the environment becomes more acidic). Enzymes are p...

DNA is made up of sequence of nucleotides ( a phosphate, a pentose sugar and nitrogenous base). It is the sequence of bases on the DNA strand that codes for proteins. A sequence of three bases is called a...