The noble gases are left out of the trends in atomic radii because there is great debate over the experimental values of their atomic radii.

The SI units for measuring atomic radii are the nanometer (nm) and the picometer (pm). 1 nm = 1 X 109 m; 1 pm = 1 X 10-12 m.

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When excess H2O2 accumulates in the cell, catalase converts it to H2O through the reaction.

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Catalase uses the H2O2 to oxidize a variety of other substrates (formic acid, formaldehyde, and alcohol) by the “peroxidation” reaction.

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Peroxisomes carry out oxidation reactions leading to the production of hydrogen peroxide.

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Peroxisomes contain oxidative enzymes: catalase and urate oxidase.

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Peroxisomes major sites of oxygen utilization (carrying out oxidative reactions).

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In plant cells,

Golgi apparatus serves as the site at which the complex polysaccharides of the cell wall (pectin & hemicellulose) are synthesized.