ScienceBiologyEnzymesPhysioEx Exercise 8
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PhysioEx Exercise 8

Travis Turner avatar Travis Turner
24 July 2022
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32 test answers

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question
Which of the following describes the effect of boiling and freezing?
answer
Boiling denatured the enzyme, but freezing had no effect.
question
What does a strong IKI result indicate?
answer
Substrate is present.
question
The presence of reducing sugars _______.
answer
is detected using Benedict's reagent
question
Which tubes demonstrated amylase activity with a small amount of reducing sugar produced?
answer
tubes 7 and 8
question
Enzymes are _______.
answer
made of protein and are catalysts
question
The substance that the enzyme acts on is called its _______.
answer
substrate
question
Amylase is secreted by _______.
answer
both the salivary glands and the pancreas
question
Maltose is a _______.
answer
disaccharide
question
The purpose of this activity was to look at the effect of _______.
answer
enzyme/substrate specificity
question
Which of the following enzyme/substrate combinations is matched INCORRECTLY?
answer
All are matched correctly.
question
The cellulase in this experiment came from _______.
answer
bacteria
question
What did the results of tube 3 demonstrate?
answer
Amylase does not digest cellulose.
question
When using the Benedict's assay, which color would indicate the most reducing sugar present?
answer
reddish brown
question
IKI is used to test for the presence of _______.
answer
starch and cellulose
question
Substrates are held in the active site by _______.
answer
hydrogen and ionic bonds
question
What is the difference between cellulose and starch?
answer
They are linked differently.
question
What occurred when pepsin was boiled?
answer
It was inactivated.
question
Pepsin is _______.
answer
a peptidase, an enzyme that digests protein and a protein that digests protein
question
Which test tubes were used to determine the optimal pH for pepsin activity?
answer
tubes 2, 5, and 6
question
The optimal pH for pepsin activity is _______.
answer
2
question
The building blocks for peptides are _______.
answer
amino acids
question
Pepsin is secreted by _______.
answer
chief cells
question
Pepsin is classified as _______.
answer
an enzyme and a peptidase
question
When BAPNA is hydrolyzed, it _______.
answer
changes from colorless to yellow
question
Which test tubes were used to determine the optimal pH for lipase activity?
answer
tubes 1, 5, and 6
question
Which test tube had the highest lipase activity?
answer
tube 1
question
Why is gastric lipase NOT as active as pancreatic lipase?
answer
The pH of the stomach is too low and no bile is present in the stomach.
question
The substrate of lipase is _______.
answer
triglyceride
question
Triglycerides _______.
answer
All of the above are true.
question
Adding bile to triglycerides _______.
answer
increases the surface area of the triglycerides
question
Which of following does NOT secrete a lipase?
answer
the small intestine
question
Prior to lipase digestion of triglycerides, the solution would be _______.
answer
more basic