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a tough substance made from a modified polysaccharide that contains nitrogen. It is the main component of the exoskeletons of arthropods, the cell walls of fungi, the radula's of molluscs and the beaks of cephalopods.
a molecule that is formed when oxygen and haemoglobin combine chemically.
modified phloem parenchyma cells that help translocate food substances in the plant.
the membrane that surrounds the nucleus. It is similar in structure and function to the cell...
teeth found at the back of the mouth just in front of the molars in the mammalian jaw, used for...