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.
The destruction of Athens' fleet at Aegospotami effectively ended the war, and Athens surrendered in the following year. Corinth and Thebes demanded that Athens should be destroyed and all its citizens should be enslaved, but Sparta refused. The Peloponnesian War reshaped the ancient Greek world. On the level of international relations, Athens, the strongest city-state in Greece prior to the war's beginning, was reduced to a state of near-complete subjection, while Sparta became established as the leading power of Greece.