PhysioEx - 8 Chemical and Physical Processes of Digestion

The purpose of this activity was to look at the effect of _______.

a. salt concentration on enzyme activity

b. temperature on enzyme activity

c. enzyme/substrate specificity

c

Which of the following enzyme/substrate combinations is matched

INCORRECTLY?

peptides - peptidase

starch - amylase

cellulose - cellulase

All are matched correctly.

Check answer

d

What did the results of tube 3 demonstrate?

a. Amylase does not digest cellulose.

b. Cellulose is a substrate of amylase.

c. The amylase contained contaminating cellulase.

d. Peptidase digests peptides.

a

a

What occurred when pepsin was

boiled?

Its activity increased.

The enzyme didn't work because the pH was too low.

It was inactivated.

The enzyme didn't work because the incubation temperature was too high.

c it was inatibtsed

Pepsin is

_______.

a peptidase

a peptidase and an enzyme that digests protein

a protein that digests protein

an enzyme that digests protein

a peptidase, an enzyme that digests protein and a protein that digests protein

d pepsis is a peptidase, an enzyme that digest protein and a protein that digest protein (actual words btw no auto correct issue)

The building blocks for peptides are

_______.

nucleic acids

maltose

amino acids

glucose

nucleic and amino acids

amino acids

Pepsin is secreted by

_______.

salivary glands

acinar cells

chief cells

goblet cells

chief cells

Pepsin is classified as

_______.

an enzyme

a substrate

an enzyme and a peptidase

a peptidase

an enzyme and a substrate

an enzyme and a peptidase

When BAPNA is hydrolyzed, it

_______.

produces reducing sugar

complexes with starch

changes from colorless to yellow

changes from yellow in color to colorless

Check answer

changes from colorless to yellow

Why is gastric lipase NOT as active as pancreatic

lipase?

The pH of the stomach is too low and no bile is present in the stomach.

No bile is present in the stomach

The pH of the stomach is too low.

The pH of the stomach is too high and no bile is present in the stomach.

The pH of the stomach is too low and no bile is present in the stomach.

IKI is used to test for the presence of

starch and cellulose

The substrate of lipase is

_______.

bile

fatty acids

monoglyceride

triglyceride

triglycerides

bc the chemical changes that occur as starch is digested to maltose cannot be seen by the naked eye , you need to conduct an enzyme

true or false, the enzyme essay ONLY indicate the presence or absence of substances