Medical Biochemistry: Enzymes Chemistry

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Oxidoreductases catalyze the reactions of oxidation and ______

reduction

The mechanism of oxidation is either by removal of hydrogen (dehydrogenases) or by addition of ______

oxygen

Transferases catalyze the transfer of groups other than hydrogen from one substrate to another. They are further classified according to the group they transfer e.g. phosphotransferases (kinases), transaminases, transketolases, ______

transmethylases

Isomerases catalyze the ______ reactions

isomerization

The ______ group of enzymes catalyze the reactions of oxidation and reduction

oxidoreductases

Enzymes are powerful and highly specific biological catalysts (The difference between ______ and un______ reactions_

catalyzed

General properties of enzymes 1. They are mostly protein in nature. NOT ALL enzymes are protein but there are some ribozymes (rRNA in nature) 2. They act within a moderate pH and temperature range. 3. They are highly specific that catalyze only one type of chemical reaction.

proteins

There are different types of specificity:  Optical specificity (stereospecificity): Enzymes act only one of 2 ______ e.g. maltase acts on α-glycosides but not β-glycosides.

isomers

There are different types of specificity:  Group specificity: Enzymes act on a specific group or linkage e.g. pepsin acts on peptide bonds.  Absolute specificity: Enzyme acts only one ______ e.g. urease enzyme acts on urea.

substrate

General properties of enzymes Enzymes Extra______ular Intra______ular They are secreted from the They are formed inside the ______ where they function. As, ______ where they function.

cell

Test your knowledge of enzymes' powerful and highly specific biological catalysts in medical biochemistry. Explore the differences between catalyzed and uncatalyzed reactions, and learn about the general properties of enzymes, including their mostly protein nature.

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