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´╗┐AP Biology Comprehensive Free Response Question List

A.P. BIOLOGY OUTLINE: CHEMISTRY OF LIFE
Water
Organic Molecules in organisms
Free energy changes
Enzymes

(1968) Suppose that you have isolated an extract from a tissue and you have found that the extract speeds up the rate of a particular reaction. What kind of information would you need to demonstrate that the substance responsible for increasing the rate of this reaction is an enzyme? Explain how this information would indicate that the catalytic effect is due to an enzyme.

(1969) Proteins functioning as enzymes exhibit precise specifications. Discuss the levels of structural organization within proteins which are responsible for specific molecular interaction.

(1972) 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
(saliva: H2O)
Student 1:9 (10%) 1:19 (5%) 1:49 (2%) 1:99 (1%)
A 45 seconds 50 seconds 100 seconds 135 seconds
B (no end point)
C 90 seconds 100 seconds 200 seconds 270 seconds
D 260 seconds 300 seconds 600 seconds 800 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.

(1973) Hypotheses derived from laboratory...