Unformatted text preview: AP Biology
1999 Free-Response Questions The materials included in these files are intended for non-commercial use by AP
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Copyright © 2001 by College Entrance Examination Board. All rights reserved. College Board, Advanced Placement Program, AP, and the acorn logo are registered
trademarks of the College Entrance Examination Board. 1999
The College Board
Advanced Placement Examination
Time—1 hour and 30 minutes
Number of questions — 4
Percent of total grade — 40
Answer all questions. Number your answer as the question is numbered below.
Answers must be in essay form. Outline form is NOT acceptable. Labeled diagrams may be used to supplement
discussion, but in no case will a diagram alone suffice. It is important that you read each question completely before
you begin to write.
1. The rate of photosynthesis may vary with changes that occur in environmental temperature, wavelength of light,
and light intensity. Using a photosynthetic organism of your choice, choose only ONE of the three variables
(temperature, wavelength of light, or light intensity) and for this variable • design a scientific experiment to determine the effect of the variable on the rate of photosynthesis for the
• explain how you would measure the rate of photosynthesis in your experiment;
describe the results you would expect. Explain why you would expect these results. 2. Communication occurs among the cells in a multicellular organism. Choose THREE of the following examples
of cell-to-cell communication, and for each example, describe the communication that occurs and the types
of responses that result from this communication. •
• Communication between two plant cells
Communication between two immune-system cells
Communication either between a neuron and another neuron, or between a neuron and a muscle cell
Communication between a specific endocrine-gland cell and its target cell Copyright © 1999 College Entrance Examination Board and Educational Testing Service. All rights reserved. 1999
3. Scientists recently have proposed a reorganization of the phylogenetic system of classification to include the
domain, a new taxonomic category higher (more inclusive) than the Kingdom category, as shown in the following diagram.
Universal Ancestor Domain Bacteria
(Eubacteria) Domain Archaea
(Archaebacteria) Domain Eukarya
(Eukaryotes) • Describe how this classification scheme presents different conclusions about the relationships among living
organisms than those presented by the previous five-kingdom system of classification. • Describe three kinds of evidence that were used to develop the taxonomic scheme above, and explain how
this evidence was used. The evidence may be structural, physiological, molecular, and/or genetic. • Describe four of the characteristics of the universal ancestor. 4. Scientists seeking to determine which molecule is responsible for the transmission of characteristics from
one generation to the next knew that the molecule must (1) copy itself precisely, (2) be stable but able to
be changed, and (3) be complex enough to determine the organism’s phenotype. •
• Explain how DNA meets each of the three criteria stated above.
Select one of the criteria stated above and describe experimental evidence used to determine that DNA
is the hereditary material. END OF EXAMINATION Copyright © 1999 College Entrance Examination Board and Educational Testing Service. All rights reserved. ...
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