Information: - Proteins (or ) are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, and transporting molecules from one location to another. Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes, and which usually results in protein folding into a specific three-dimensional structure that determines its activity. - In chemistry isomerization (also isomerisation) is the process by which one molecule is transformed into another molecule which has exactly the same atoms, but the atoms have a different arrangement e.g. A-B-C B-A-C (these related molecules are known as isomers ). In some molecules and under some conditions, isomerization occurs spontaneously. Many isomers are equal or roughly equal in bond energy, and so exist in roughly equal amounts, provided that they can interconvert somewhat freely; that is, the energy barrier between the two isomers is not too high. When the isomerization occurs intramolecularly it is considered a rearrangement reaction. - In computer science, ACID ("Atomicity, Consistency, Isolation, Durability") is a set of properties of database transactions. In the context of databases, a single logical operation on the data is called a transaction. For example, a transfer of funds from one bank account to another, even involving multiple changes such as debiting one account and crediting another, is a single transaction. - Aconitase (aconitate hydratase) is an enzyme that catalyses the stereo-specific isomerization of citrate to isocitrate via "cis"-aconitate in the tricarboxylic acid cycle, a non-redox-active process. - 3 - Isopropylmalate dehydratase ( E.C.4.2.1.33 ) is an aconitase homologue , which catalyses the isomerisation of 2 - isopropylmalate to 3 - isopropylmalate , via dehydration , in the biosynthesis of leucine . - Leucine (abbreviated as Leu or L; encoded by the six codons UUA, UUG, CUU, CUC, CUA, and CUG) is an -amino acid used in the biosynthesis of proteins. It contains an -amino group (which is in the protonated NH form under biological conditions), an -carboxylic acid group (which is in the deprotonated COO form under biological conditions), and an isobutyl side chain, classifying it as a nonpolar (at physiological pH) amino acid. It is essential in humansmeaning the body cannot synthesize it and thus must obtain from the diet. - Redox (short for reductionoxidation reaction) is a chemical reaction in which the oxidation states of atoms are changed. Any such reaction involves both a reduction process and a complementary oxidation process, two key concepts involved with electron transfer processes. Redox reactions include all chemical reactions in which atoms have their oxidation state changed; in general, redox reactions involve the transfer of electrons between chemical species. The chemical species from which the electron is stripped is said to have been oxidized, while the chemical species to which the electron is added is said to have been reduced. It can be explained in simple terms: After reading the paragraphs above, we are interested in knowing the entity with which '3-isopropylmalate dehydratase' exhibits the relationship of 'instance of'. Find the answer from the choices below. Choices: - amino acid - bond - carboxylic acid - chain - chemical reaction - computer - data - database - dna - enzyme - humans - key - location - process - rearrangement reaction - science - sequence - set - side - six - state - structure - three - two
The answer to this question is:
enzyme