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Write the balance equation in the above reaction.       2. How much energy is given off in the reaction? _______________________________________________________

Write the balance equation in the above reaction.       2. How much energy is given off in the reaction? _______________________________________________________

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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  1. Write the balance equation in the above reaction.

 

 

 

2. How much energy is given off in the reaction?

_________________________________________________________________________________________________________________________________________

 

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Activity 3 Alcoholic Fermentation Use the following data for your graph and to answer the question guide in the manual. Results: Original bubble Sample 15 mins 30 mins 45 mins 60 mins 75 mins 90 mins length (mm) Glucose 15 45 75 75 75 Galactos 2 2 5 Fructose 20 36 60 65 65 Xylose Maltose 10 15 20 Lactose 1 Sucrose 10 23 40 78 80 82 Starch 2 un 1.
Transcribed Image Text:Activity 3 Alcoholic Fermentation Use the following data for your graph and to answer the question guide in the manual. Results: Original bubble Sample 15 mins 30 mins 45 mins 60 mins 75 mins 90 mins length (mm) Glucose 15 45 75 75 75 Galactos 2 2 5 Fructose 20 36 60 65 65 Xylose Maltose 10 15 20 Lactose 1 Sucrose 10 23 40 78 80 82 Starch 2 un 1.
ACTIVITY NO. 3 ALCOHOLIC FERMENTATION Introduction The conversion of carbohydrate such as sugar into an acid or alcohol is called fermentation. Fermentation that uses yeast is termed as alcoholic fermentation, Glucose -----→ carbon dioxide and alcohol + energy The enzyme in yeast catalyzes alcoholic fermentation which actually occurs as a two- step process. This process takes place under anaerobic conditions such as in the absence of oxygen liberating a small amount of energy. Some carbohydrates are not hydrolyzed to simple sugars by yeast under anaerobic conditions due to the lack of the specific enzymes needed to catalyze the reaction. Fermentation of simple sugars by yeast has different rates of reaction. 1. The first step involves the decarboxylation of pyruvate from glycolysis to acetaldehyde acted by the enzyme pyruvate decarboxylase. 2. The second step is the reduction of acetaldehyde which is catalyzed by alcohol dehydrogenase producing ethanol and carbon dioxide as the end products. Objectives: At the end of the activity, the student can: 1. Compares the rate of fermentation of the different samples used. 2. Identify which samples are readily fermented, fermented with difficulty and not fermented at all. Reagents: (8 ml each sample) 10% glucose, fructose, galactose, maltose, lactose, sucrose, xylose, starch solutions, 32 ml - 10% yeast solution Materials: 8 plastic cups, 8 test tubes (10 ml), dropper, ruler, 10 ml graduated cylinder, Test tube rack Procedure: 1. Obtain 8 clean test tubes and label them. 2. Fill each tube 1/3 full with yeast suspension. 3. Add sample to completely fill the tube. 4. Hold filled tube upright. 5. Place plastic cup on over the tube. 6. Quickly invert the plastic cup. Be careful not to tip the tube. If procedure is correctly done, only a small air bubble will be present in the upper end of the tube. 7. Measure the length of the air bubble if present. Note its length in millimeter. Record length as original bubble. 8. Examine the tubes every 15 minute interval and measure length of any bubble as they develop and increase in size. Subtract the length of the original bubble from all new measurements to yield net bubble length. Continue observation over a 90 minute period. 9. Plot your data in a graph. Use only I graph for all 8 samples
Transcribed Image Text:ACTIVITY NO. 3 ALCOHOLIC FERMENTATION Introduction The conversion of carbohydrate such as sugar into an acid or alcohol is called fermentation. Fermentation that uses yeast is termed as alcoholic fermentation, Glucose -----→ carbon dioxide and alcohol + energy The enzyme in yeast catalyzes alcoholic fermentation which actually occurs as a two- step process. This process takes place under anaerobic conditions such as in the absence of oxygen liberating a small amount of energy. Some carbohydrates are not hydrolyzed to simple sugars by yeast under anaerobic conditions due to the lack of the specific enzymes needed to catalyze the reaction. Fermentation of simple sugars by yeast has different rates of reaction. 1. The first step involves the decarboxylation of pyruvate from glycolysis to acetaldehyde acted by the enzyme pyruvate decarboxylase. 2. The second step is the reduction of acetaldehyde which is catalyzed by alcohol dehydrogenase producing ethanol and carbon dioxide as the end products. Objectives: At the end of the activity, the student can: 1. Compares the rate of fermentation of the different samples used. 2. Identify which samples are readily fermented, fermented with difficulty and not fermented at all. Reagents: (8 ml each sample) 10% glucose, fructose, galactose, maltose, lactose, sucrose, xylose, starch solutions, 32 ml - 10% yeast solution Materials: 8 plastic cups, 8 test tubes (10 ml), dropper, ruler, 10 ml graduated cylinder, Test tube rack Procedure: 1. Obtain 8 clean test tubes and label them. 2. Fill each tube 1/3 full with yeast suspension. 3. Add sample to completely fill the tube. 4. Hold filled tube upright. 5. Place plastic cup on over the tube. 6. Quickly invert the plastic cup. Be careful not to tip the tube. If procedure is correctly done, only a small air bubble will be present in the upper end of the tube. 7. Measure the length of the air bubble if present. Note its length in millimeter. Record length as original bubble. 8. Examine the tubes every 15 minute interval and measure length of any bubble as they develop and increase in size. Subtract the length of the original bubble from all new measurements to yield net bubble length. Continue observation over a 90 minute period. 9. Plot your data in a graph. Use only I graph for all 8 samples
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