QUESTION 9 How did this experiment with Benedict\'s solution demonstrate the dig

Question

QUESTION 9

How did this experiment with Benedict's solution demonstrate the digestion of starch by amylase? In other words, how did you know the starch was digested?

We compared control samples with samples that had been treated with amylase and measured the pH using a pH indicator. When the solution becomes orange or red, it indicates that the starch has been digested.

We compared control samples with samples that had been treated with amylase and used a Benetict's test for Reducing Sugar. When Benedict's turns orange/red it indicates that starch has been digested.

We compared control samples the sample to been treated with amylase and observed which had become liquefied. The solution becomes liquefied, it indicates that the starches have been digested.

Compare control samples with samples that had been treated with amylase. Benedict's turns light blue it indicates that starch has been digested.

QUESTION 10

What happens to saliavry amylase when it arrives with the bolus in the stomach? Because of this, what happens to charbohydrate digestion? (Hint: Look up the optimum pH for amylase and what is the pH of the gastric juices)

When the bolus hit the stomach, the amylase enyzmes continue to function and starch digestion continues.

When the bolus hit the stomach, the amylase enyzmes denature and cease to function and starch digestion stops.

When the bolus hit the stomach, the amylase enyzmes denature and cease to function. However, starch digestion continues because pepsin continues the digestion of starch.

We compared control samples with samples that had been treated with amylase and measured the pH using a pH indicator. When the solution becomes orange or red, it indicates that the starch has been digested.

We compared control samples with samples that had been treated with amylase and used a Benetict's test for Reducing Sugar. When Benedict's turns orange/red it indicates that starch has been digested.

We compared control samples the sample to been treated with amylase and observed which had become liquefied. The solution becomes liquefied, it indicates that the starches have been digested.

Compare control samples with samples that had been treated with amylase. Benedict's turns light blue it indicates that starch has been digested.

Explanation / Answer

9. Option B

Benedicts gives positive result for reducing sugars (monosaccharides and some disaccharides). Therefore starch gives negative result. However, when starch is treated with amylase, it is converted monomeric glucose units, which react with benedict’s reagent and reduces copper (II) ions to copper (I) ions, that results in color change to orange or brick red.

10. Option B

Salivary amylase is denatured by pH 1 to 2 in stomach (parietal cells secrete HCl). Starch digestion stops (however, starch is again digested later by pancreatic amylase). Pepsin breaks down proteins into smaller peptides.

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