Enzyme specificity — definition?
Enzyme catalyzes only one thermodynamically feasible substrate transformation.
Substrate recognition — role?
Enzymes selectively bind and convert specific substrates.
Reducing sugars — property?
Contain a free semi-acetal hydroxyl group, reducing Fehling's reagent.
α-Amylase — function?
Hydrolyzes α(1→4) bonds in starch, producing oligosaccharides.
Invertase — function?
Hydrolyzes sucrose into glucose and fructose.
Carbohydrate hydrolysis — process?
Breaking glycosidic bonds to produce smaller sugars.
Enzyme sources — examples?
Saliva for α-amylase; yeast Saccharomyces cerevisiae for invertase.
Reaction indicators — used?
Fehling's reagent for reducing sugars; Lugol for starch.
Laboratory methods — key step?
Incubate enzyme with substrate at 37°C for 30 min.
Enzyme activity testing — purpose?
Qualitatively detect substrate hydrolysis via colorimetric reactions.
Enzyme specificity — main determinant?
Active site structure and cofactors.
Substrate recognition — mechanism?
Molecular complementarity via structural fit.
Reducing sugars — examples?
Glucose, fructose, maltose, lactose.
α-Amylase — substrate?
Starch and glycogen.
Invertase — substrate?
Sucrose.
Reaction indicator — Cu2O?
Red precipitate indicating reducing sugars.
Reaction indicator — blue color?
Starch presence detected by Lugol's solution.
Preparation of starch solution?
Dissolve 10 g starch in 1 L water.
Source of invertase?
Yeast Saccharomyces cerevisiae.
Incubation conditions?
37°C for 30 minutes.
Answer 10 questions on Enzyme Specificity and Carbohydrate Hydrolysis.
1. Which institution is cited as the source for the definitions of substrate specificity and molecular recognition in the context of enzyme activity?
2. What is the cause of the specific enzyme activity observed in carbohydrate hydrolysis involving α-amylase and invertase?
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