The course

• 1

  Start here

  One written test in three hours: 9 to 11 question clusters, 45 to 55 questions, about 60% multiple choice and 40% constructed response, 1 credit each.

  Free: A tour of the biology course
• 2

  Topic 1: Structure and Function

  3 of the 24 questions on each timed check

  From DNA to proteinsBody systems and homeostasis29 questions
• 3

  Topic 2: Matter and Energy in Organisms and Ecosystems

  3 of the 24 questions on each timed check

  Free: Photosynthesis and building moleculesCellular respiration, with and without oxygenEnergy flow, food webs and the carbon cycle31 questions
• 4

  Topic 3: Interdependent Relationships in Ecosystems

  5 of the 24 questions on each timed check

  Carrying capacity and biodiversityEcosystem change and human impactGroup behavior33 questions
• 5

  Topic 4: Inheritance and Variation of Traits

  5 of the 24 questions on each timed check

  Mitosis, differentiation and human reproductionChromosomes, DNA and variationFree: Probability and the inheritance of traits35 questions
• 6

  Topic 5: Natural Selection and Evolution

  5 of the 24 questions on each timed check

  Evidence for common ancestryNatural selection and adaptationEnvironmental change, speciation and extinction24 questions
• 7

  Topic 6: Earth's Systems

  1 of the 24 questions on each timed check

  Carbon, climate and the coevolution of life and Earth18 questions
• 8

  Topic 7: Engineering, Technology, and the Applications of Science

  2 of the 24 questions on each timed check

  Engineering design and trade-offs17 questions