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In details

Glossary - Letters U / V / W

Ulcer - Generically, superficial lesion of an organ. Peptic ulcers are ulcers of the stomach mucosa and duodenum. Unicellular - Consists of only one cell. Univitelinos - Of same calf. See homozygote. Urea - Substance produced by the vertebrate liver from ammonia and carbon dioxide.
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2.4: Sugars - Biology

Sugars, and glucose in particular, are important molecules for cells because they are the primary energy source. Sugars have the general chemical formula CH2O and can be joined together almost infinitely for storage. However, because they are hydrophilic, they allow water molecules to intercalate between them, and cannot pack as efficiently as fats, which are hydrophobic and thus exclude water.
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