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an enzyme that catalyses (speeds up) the hydrolysis (breaking) of a chemical bond.
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...
cellular respiration that takes place in the presence of free oxygen.
a type of nuclear division during which somatic cells divide into new cells for growth or to...
a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.