Lecture Notes: AP Biology Study Guide

Overview of AP Biology Exam

• The AP Biology exam is a 3-hour test.
• Composed of:
  • 60 multiple-choice questions (1 hour 30 minutes) - 50% of score.
  • 6 free-response questions (1 hour 30 minutes) - 50% of score.
• Exam content categories:
  • Chemistry of Life: 8-11%
  • Cell Structure and Function: 10-13%
  • Cellular Energetics: 12-16%
  • Cell Communication and Cell Cycle: 10-15%
  • Heredity: 8-11%
  • Gene Expression and Regulation: 12-16%
  • Natural Selection: 13-20%
  • Ecology: 10-15%

Chemistry of Life

• Key concepts include water's properties, macromolecules like proteins and nucleic acids.
• Water
  • Polar molecule, forms hydrogen bonds.
  • Acts as solvent, facilitates cohesion and adhesion.
• Carbon
  • Can form four bonds, enables diverse organic molecules.
• Macromolecules
  • Proteins, carbohydrates, lipids, nucleic acids.
  • Formed via dehydration synthesis, broken down by hydrolysis.

Cell Structure and Function

• Cell Types
  • Prokaryotes: No nucleus, single circular chromosome.
  • Eukaryotes: Membrane-bound nucleus, multiple chromosomes.
• Organelles
  • Nucleus, Mitochondria, Chloroplasts, ER, Golgi Apparatus, Ribosomes, Lysosomes.
• Cell Membrane
  • Fluid mosaic model, selective permeability, phospholipid bilayer.
• Cell Size
  • Surface area to volume ratio limits cell growth.

Cellular Energetics

• Enzymes
  • Catalysts, lower activation energy.
  • Affected by temperature, pH, substrate concentration.
• Photosynthesis
  • Converts light energy to chemical energy.
  • Two phases: Photolysis and Calvin cycle.
• Cellular Respiration
  • Breaks down glucose into ATP.
  • Involves glycolysis, Krebs cycle, oxidative phosphorylation.

Cell Communication and Cell Cycle

• Cell Signaling
  • Paracrine, autocrine, endocrine, and cell-cell contact.
• Signal Transduction
  • Pathways linking signals to responses.
• Cell Cycle
  • Interphase (G1, S, G2) and Mitosis (Prophase, Metaphase, Anaphase, Telophase).
  • Checkpoints ensure cell integrity.

Heredity

• Meiosis
  • Produces gametes, involves crossing over.
• Genetic Diversity
  • Independent assortment, recombination, random fertilization.
• Mendelian Genetics
  • Laws of Segregation, Independent Assortment, Dominance.

Gene Expression and Regulation

• DNA and RNA
  • DNA: genetic information storage.
  • RNA: carries genetic instructions for proteins.
• Gene Regulation
  • Transcription factors, regulatory sequences, epigenetics.

Natural Selection

• Evolution
  • Change in genetic traits over generations.
  • Driven by natural selection, supported by evidence from various fields.
• Speciation and Extinction
  • Allopatric and sympatric mechanisms, adaptive radiation.

Ecology

• Levels of Organization
  • Organism, Population, Community, Ecosystem, Biosphere.
• Energy Flow
  • Producers, consumers, decomposers.
• Population Dynamics
  • Growth models: Exponential and logistic.
• Community Interactions
  • Mutualism, commensalism, parasitism, competition.
• Human Impact
  • Invasive species, pollution, habitat destruction.

These notes encapsulate the main topics and concepts from the AP Biology Study Guide, highlighting critical areas in the Chemistry of Life, Cell Function, Energetics, Communication, Heredity, Gene Regulation, Ecology, and Natural Selection. Use these to review for the exam and gain a deep understanding of each topic.