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Cysteine contains an S atom in its R group. Where 2 molecules of cysteine are found together, strong covalent bonds or "disulfide bridges" can form between the two S atoms (S=S). R...

Respiration is the process by which cells make energy. Aerobic respiration uses oxygen to make energy. Respiration involves a series of reactions.
The overall equation for the reaction is:Oxygen + G...

Evolution by natural selection occurs when random mutations in the genome of an organism causes phenotypic traits (observable characteristics or traits) to be different between individual...

The main muscle of normal quiet breathing is the diaphragmDuring Inspiration, it contracts which causes it to flatten. This increases the volume of the thoracic cavity and so the pressure decreases. This ...

Oxygen moves via diffusion from the alveoli in the lungs where there is a high concentration of oxygen, into the blood where there is a low concentration of oxygen - it moves down its concentration gradie...