ap biology essay 2013



AP® Biology. 2013 Scoring Guidelines. The College Board. The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association is made up of
AP® Biology. 2013 Free-Response Questions. About the College Board. The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association is.
A 2013 AP Biology Exam—previously available only through your AP Course Audit account—is now available below. This means you can now use the questions ... Exam Questions and Scoring Information. For free-response questions from the 2013 exam onward, along with scoring information, check out the tables below.
The table below shows the amino acid sequence of the carboxyl-terminal segment of a conserved polypeptide from four different, but related, species. Each amino acid is represented by a three-letter abbreviation, and the amino acid residues in the polypeptide chains are numbered from the amino end to the carboxyl end.
In an investigation of fruit-fly behavior, a covered choice chamber is used to test whether the spatial distribution of flies is affected by the presence of a substance placed at one end of the chamber. To test the flies' preference for glucose, 60 flies are introduced into the middle of the choice chamber at the insertion point
An absorption spectrum indicates the relative amount of light absorbed across a range of wavelengths. The graphs above represent the absorption spectra of individual pigments isolated from two different organisms. One of the pigments is chlorophyll a, commonly found in green plants. The other pigment is.
Fossils of lobe-finned fishes, which are ancestors of amphibians, are found in rocks that are at least 380 million years old. Fossils of the oldest amphibian-like vertebrate animals with true legs and lungs are found in rocks that are approximately 363 million years old. Three samples of rocks are available that might contain
In an experiment, rats averaging 300 g of body mass were tested several times over a three-month period. For each individual rat, urine was collected over a three-hour period after ingestion of 10 mL of liquid (water, 1 percent ethyl alcohol solution, or 5 percent ethyl alcohol solution). The volume of urine was then measured
The figure above represents a generalized hormone-signaling pathway. Briefly explain the role of each numbered step in regulating target gene expression. (3 points maximum). • Step 1 = hormone/ligand binding to receptor to initiate/trigger/induce signaling OR signal reception. • Step 2 = an intracellular cascade that
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