Carbon and the Molecular Diversity of Life

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Biology, 8th ed. by Campbell et al.

amino group

A chemical group consisting of a nitrogen atom bonded to two hydrogen atoms; can act as a base in solution, accepting a hydrogen ion and acquiring a charge of 1+.

ammonia

A small, very toxic molecule (NH<sub>3</sub>) produced by nitrogen fixation or as a metabolic waste product of protein and nucleic acid metabolism.

carbonyl group

A chemical group present in aldehydes and ketones and consisting of a carbon atom double-bonded to an oxygen atom.

carboxyl group

A chemical group present in organic acids and consisting of a single carbon atom double-bonded to an oxygen atom and also bonded to a hydroxyl group.

enantiomer

One of two compounds that are mirror images of each other.

functional group

A specific configuration of atoms commonly attached to the carbon skeletons of organic molecules and usually involved in chemical reactions.

geometric isomer

One of several compounds that have the same molecular formula and covalent arrangements but differ in the spatial arrangements of their atoms owing to the inflexibility of double bonds.

hydrocarbon

An organic molecule consisting only of carbon and hydrogen.

hydroxyl group

A chemical group consisting of an oxygen atom joined to a hydrogen atom. Molecules possessing this group are soluble in water and are called alcohols.

isomer

One of several compounds with the same molecular formula but different structures and therefore different properties. The three types of isomers are structural isomers, geometric isomers, and enantiomers.

methyl group

A chemical group consisting of a carbon bonded to three hydrogen atoms. The methyl group may be attached to a carbon or to a different atom.

organic chemistry

The study of carbon compounds (organic compounds).

phosphate group

A chemical group consisting of a phosphorus atom bonded to four oxygen atoms; important in energy transfer.

sulfhydryl group

A chemical group consisting of a sulfur atom bonded to a hydrogen atom.

urea

A soluble nitrogenous waste produced in the liver by a metabolic cycle that combines ammonia with carbon dioxide.

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