Skip to content
NGSSAPhigh school

AP Biology

Master the 8 units of AP Biology -- from the chemistry of life through ecology. You will build deep understanding of cells, genetics, evolution, and ecosystems, with targeted practice on the concepts students find most challenging on the AP exam.

8units
14topics
212questions
~5hours

Course Units

Learning objectives

  • Explain how the structure of water contributes to its biological properties including cohesion, adhesion, and high specific heat
  • Identify the four major macromolecules and describe their monomers, polymers, and functions
  • Describe enzyme structure, function, and regulation including factors that affect enzyme activity
  • Explain how the properties of carbon make it central to the chemistry of life
  • Analyze how changes in pH, temperature, and substrate concentration affect enzyme kinetics

Topics in this unit

Learning objectives

  • Compare prokaryotic and eukaryotic cell structures and their functions
  • Explain the structure and function of major organelles including the endomembrane system
  • Describe mechanisms of passive and active transport across membranes
  • Explain how compartmentalization organizes cell functions and increases efficiency
  • Predict the direction of water movement across a semipermeable membrane given solute concentrations

Topics in this unit

Learning objectives

  • Describe the stages of cellular respiration (glycolysis, Krebs cycle, oxidative phosphorylation) and their locations within the cell
  • Explain the light-dependent and light-independent reactions of photosynthesis
  • Compare photosynthesis and cellular respiration as complementary energy transformations
  • Describe the role of ATP as the energy currency of the cell and the chemiosmotic mechanism
  • Analyze how environmental factors like light intensity and CO2 concentration affect the rate of photosynthesis

Learning objectives

  • Describe the three stages of cell signaling: reception, transduction, and response
  • Explain how positive and negative feedback mechanisms maintain homeostasis
  • Describe the stages and regulation of the cell cycle including checkpoints
  • Explain how disruptions to cell cycle regulation can lead to cancer
  • Compare signal amplification in different transduction pathways

Learning objectives

  • Describe the process of meiosis and how it produces genetic variation
  • Apply Mendel's laws of segregation and independent assortment to predict inheritance patterns
  • Explain non-Mendelian inheritance including incomplete dominance, codominance, epistasis, and polygenic traits
  • Describe how crossing over, independent assortment, and random fertilization contribute to genetic diversity
  • Use chi-square analysis to evaluate whether observed genetic ratios match expected Mendelian ratios

Topics in this unit

Learning objectives

  • Describe DNA structure and the process of semiconservative replication
  • Explain the steps of transcription and translation in gene expression
  • Describe mechanisms of gene regulation in prokaryotes (operons) and eukaryotes (transcription factors, epigenetics)
  • Evaluate the impact of different types of mutations on protein structure and function
  • Explain applications of biotechnology including gel electrophoresis, PCR, and genetic engineering

Learning objectives

  • Describe multiple lines of evidence supporting biological evolution (fossil, molecular, anatomical, biogeographic)
  • Explain how natural selection drives adaptation in populations
  • Analyze Hardy-Weinberg equilibrium and identify the five causes of allele frequency change
  • Distinguish between allopatric and sympatric speciation and the role of reproductive isolation
  • Interpret phylogenetic trees and use them to determine evolutionary relationships

Topics in this unit

Learning objectives

  • Trace energy flow through trophic levels in an ecosystem and explain the 10% rule
  • Explain biogeochemical cycles including the carbon and nitrogen cycles
  • Analyze population growth models (exponential vs logistic) and identify density-dependent and density-independent limiting factors
  • Describe community interactions including symbiosis, competition, predation, and keystone species
  • Evaluate the impact of human activity on biodiversity, climate change, and ecosystem stability