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  1. 1.A.1 Natural selection is a major mechanism of evolution. 5.3 The student can evaluate the evidence provided by data sets in relation to a particular scientific question. 1.9 The student is able to evaluate evidence provided by data from many scientific disciplines that support biological evolution.

  2. What a phylogenetic tree is. How to read phylogenetic trees and determine which species are most related. Key points: A phylogenetic tree is a diagram that represents evolutionary relationships among organisms. Phylogenetic trees are hypotheses, not definitive facts.

  3. Cell signaling pathways begin when the ligand binds to a receptor, a protein that is embedded in the plasma membrane of the target cell or found in the cell cytoplasm. The receptors are very specific, and each ligand is recognized by a different one. This stage of the pathway is called reception. Molecules that are nonpolar, such as steroids ...

  4. Everyday Connection for AP® Courses. Until recently, these three species of short-tailed pythons, Python curtus, Python brongersmai (middle), and Python breitensteini were considered one species. However, due to the different locations in which they are found, they have become three distinct species. Figure 18.12.

  5. Today, most biologists define evolution more specifically as a process in which the genetic makeup of a population changes over time. This definition encompasses both large changes over long timescales, à la Darwin, and smaller shifts in genetic makeup that happen over shorter periods.

  6. Learn AP Biology using videos, articles, and AP-aligned multiple choice question practice. Review the fundamentals of biochemistry, cell biology, genetics, evolution, and ecology, and develop scientific thinking skills as you explore the study of life.

  7. The AP Biology exam is three hours long, with two sections that take up an hour and a half each. The multiple-choice section has 60 questions, and the free-response section has six questions. The content of the exam spans four major themes, or Big Ideas, that are central to the course. These include the following:

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