User:Zephyris/Sandbox2/Did you know


 * ...that human metabolism cannot synthesise 8 to 10 (depending on age) of the 20 standard amino acids?
 * ...that the sugar ribose is vital for all life as it is used in the synthesis of DNA, RNA and ATP?
 * ...that nitrogen can only be fixed metabolically by a group of prokaryotes known as diazotrophs?
 * ...that in humans the balance between anabolism and catabolism of glucose is largely regulated by insulin?
 * ...that hydrogen can be biologicaly produced by some algae with the enzyme hydrogenase?