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L-lactate dehydrogenase: L-lactic acid:: Salivary α-amylase: __________

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L-lactate dehydrogenase: L-lactic acid:: Salivary α-amylase: __________

(a) D-aminoacid

(b) L-aminoacid

(c) α- 1,4 glycoside linkage

(d) D-glucose

The question was posed to me during an online exam.

The question is from Specificity of Enzyme Action topic in section Enzymes of Enzyme Technology

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Best answer
The correct answer is (c) α- 1,4 glycoside linkage

The best I can explain: The type of specificity in which the enzymes is showing specificity towards only one type of isomers is referred to as stereo specificity. L-lactate dehydrogenase shows stereo specificity to L-lactic and not D-lactic acid. In the same way, salivary α-amylase acts on α- 1,4 glycoside linkage and is inactive on β-1,4 glycoside linkage.

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