Lipids are used by organisms for energy storage, as a signalling molecule (e.g., steroid hormones), and as a structural component of cell membranes. Although there is no single common structure for lipids, the most commonly occurring class of lipids are triglycerides, which are fats and oils.ipid Structure. The second most abundant class of lipids are the phospholipids, which are found in animal and plant cell membranes. Phospholipids also contain glycerol and fatty acids, plus the contain phosphoric acid and a low-molecular-weight alcohol.
As soon as this was over, Plataea was besieged by a combined force of Sparta and Thebes. In 431 B.C. when the corn was ripe, King Archidamus with a large Peloponnesian army invaded Attica, in an effort to destroy the Athenian countryside. This he did, causing the country people to flee to the city of Athens.
In 459 BC Athens took advantage between the Megara and Corinth war siding with Megara. This helped them gain a foothold on the Isthmus of Corinth. This resulted in a war, known as the 'The First Peloponnesian War' fought between Athens and Sparta, Corinth, Aegean and other states. At the end of the war, however, Athens backed out from Greek mainland, due to an enormous attack by the Spartans. A thirty years treaty was signed between Athens and Sparta in 446 BC.