...salivary amylase...? A class of biology students performed an experiment on the digestion
of starch by salivary amylase. Each student determined the length of time
required for different dilutions of his saliva to digest completely a standard
concentration of starch. Iodine was used to test for the presence of starch.
The results obtained by some of the class are summarized in the table below.
TIME REQUIRED FOR THE DISAPPEARANCE OF STARCH WITH VARIOUS
SALIVA DILUTIONS
Dilutions (saliva: H2O)
Student1:9 (10%)1:19 (5%)1:49 (2%)1:99 (1%)
A45 seconds 50 seconds100 seconds135 seconds
B(no end point) ----------------------------
C90 seconds100 seconds 200 seconds 270 seconds
D 260 seconds300 seconds600 seconds800 seconds
a. Present the data for Student A in graphic form.
b. Carefully examine the data collected by the four students above and state
as many conclusions as you can that are supported by these data.
c. Assuming there have been no errors in techniques, form as many hypotheses
as you can to explain the differences observed.
d. Design one experiment to test the validity of one hypothesis.
Clearly state what data you would want to collect in this experiment to
test your hypothesis.
of starch by salivary amylase. Each student determined the length of time
required for different dilutions of his saliva to digest completely a standard
concentration of starch. Iodine was used to test for the presence of starch.
The results obtained by some of the class are summarized in the table below.
TIME REQUIRED FOR THE DISAPPEARANCE OF STARCH WITH VARIOUS
SALIVA DILUTIONS
Dilutions (saliva: H2O)
Student1:9 (10%)1:19 (5%)1:49 (2%)1:99 (1%)
A45 seconds 50 seconds100 seconds135 seconds
B(no end point) ----------------------------
C90 seconds100 seconds 200 seconds 270 seconds
D 260 seconds300 seconds600 seconds800 seconds
a. Present the data for Student A in graphic form.
b. Carefully examine the data collected by the four students above and state
as many conclusions as you can that are supported by these data.
c. Assuming there have been no errors in techniques, form as many hypotheses
as you can to explain the differences observed.
d. Design one experiment to test the validity of one hypothesis.
Clearly state what data you would want to collect in this experiment to
test your hypothesis.