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Boiling denatured the enzyme, but freezing had no effect. |
Which of the following describes the effect of boiling and freezing? Boiling and freezing both denatured amylase. Boiling and freezing had no effect on amylase. Boiling denatured the enzyme, but freezing had no effect. Freezing denatured the enzyme, but boiling had no effect. |
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Substrate is present. |
What does a strong IKI result indicate? Product of the reaction is present. Amylase is working. Amylase activity is optimal. Substrate is present. |
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is detected using Benedict’s reagent |
The presence of reducing sugars _______. is detected using Benedict’s reagent means that amylase has been denatured means that the substrate is present is detected using IKI |
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tubes 7 and 8 |
Which tubes demonstrated amylase activity with a small amount of reducing sugar produced? tubes 7 and 8 tubes 5 and 6 tubes 1 and 2 tubes 3 and 4 |
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made of protein and are catalysts |
Enzymes are _______. made of protein, are catalysts, and permanently changed by the substrate made of protein made of protein and are catalysts permanently changed by the substrate are catalysts |
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substrate |
The substance that the enzyme acts on is called its _______. product subunit monomer substrate |
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both the salivary glands and the pancreas |
Amylase is secreted by _______. the stomach the small intestine both the salivary glands and the pancreas the salivary glands the pancrease |
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disaccharide |
Maltose is a _______. complex carbohydrate disaccharide type of starch monosaccharide |
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enzyme/substrate specificity |
The purpose of this activity was to look at the effect of _______. temperature on enzyme activity enzyme/substrate specificity pH on enzyme activity salt concentration on enzyme activity |
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All are matched correctly. |
Which of the following enzyme/substrate combinations is matched INCORRECTLY? peptides – peptidase starch – amylase cellulose – cellulase All are matched correctly. |
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bacteria |
The cellulase in this experiment came from _______. fungi a plant an animal bacteria |
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Amylase does not digest cellulose. |
What did the results of tube 3 demonstrate? Peptidase digests peptides. Amylase does not digest cellulose. Cellulose is a substrate of amylase. The amylase contained contaminating cellulase. |
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reddish brown |
When using the Benedict’s assay, which color would indicate the most reducing sugar present? reddish brown green orange blue |
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starch and cellulose |
IKI is used to test for the presence of _______. cellulose starch and cellulose starch and protein protein starch |
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hydrogen and ionic bonds |
Substrates are held in the active site by _______. hydrogen and covalent bonds ionic bonds covalent bonds hydrogen bonds hydrogen and ionic bonds |
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They are linked differently. |
What is the difference between cellulose and starch? They are linked differently. They are in different locations in the animal cell. Starch is a polysaccharide, but cellulose is not. Cellulose is a polysaccharide, but starch is not. |
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It was inactivated. |
What occurred when pepsin was boiled? It was inactivated. The enzyme didn’t work because the incubation temperature was too high. The enzyme didn’t work because the pH was too low. Its activity increased. |
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a peptidase, an enzyme that digests protein and a protein that digests protein |
Pepsin is _______. a peptidase, an enzyme that digests protein and a protein that digests protein a peptidase and an enzyme that digests protein a protein that digests protein a peptidase an enzyme that digests protein |
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tubes 2, 5, and 6 |
Which test tubes were used to determine the optimal pH for pepsin activity? tubes 2, 3, and 4 tubes 2, 5, and 6 tubes 4, 5, and 6 tubes 1, 2, and 3 |
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2 |
The optimal pH for pepsin activity is _______. The activity was the same at a pH of 2, 7 and 9. 7 9 2 |
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amino acids |
The building blocks for peptides are _______. maltose nucleic and amino acids glucose amino acids nucleic acids |
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chief cells |
Pepsin is secreted by _______. chief cells goblet cells salivary glands acinar cells |
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an enzyme and a peptidase |
Pepsin is classified as _______. a substrate an enzyme and a substrate an enzyme and a peptidase a peptidase an enzyme |
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changes from colorless to yellow |
When BAPNA is hydrolyzed, it _______. changes from colorless to yellow produces reducing sugar complexes with starch changes from yellow in color to colorless |
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tubes 1, 5, and 6 |
Which test tubes were used to determine the optimal pH for lipase activity? tubes 1, 5, and 6 tubes 2, 3, and 4 tubes 1, 2, and 3 tubes 2, 5, and 6 |
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tube 1 |
Which test tube had the highest lipase activity? tube 4 tube 3 tube 1 tube 2 |
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The pH of the stomach is too low and no bile is present in the stomach. |
Why is gastric lipase NOT as active as pancreatic lipase? The pH of the stomach is too high and no bile is present in the stomach. No bile is present in the stomach. The pH of the stomach is too high. The pH of the stomach is too low and no bile is present in the stomach. The pH of the stomach is too low. |
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triglyceride |
The substrate of lipase is _______. bile fatty acids monoglyceride triglyceride |
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All of the above are true. |
Triglycerides _______. are digested by lipase are fats are lipids dissolve poorly in water All of the above are true. |
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increases the surface area of the triglycerides |
Adding bile to triglycerides _______. chemically modifies the triglycerides causes them to clump digests triglycerides into monoglyceride and two fatty acids increases the surface area of the triglycerides |
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the small intestine |
Which of following does NOT secrete a lipase? the small intestine the salivary glands the stomach the pancreas |
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more basic |
Prior to lipase digestion of triglycerides, the solution would be _______. more basic less alkaline more acidic and less alkaline more acidic |
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