BIOLOGY 20
Unit 1: Energy and Matter Exchange in the Biosphere
The constant flow of energy and cycling of matter in the biosphere leads to a balanced or steady state. This balance is achieved through various biogeochemical cycles and the processes of photosynthesis and cellular respiration.
Unit 2: Ecosystems and Population Change
Students become familiar with a range of ecosystems by studying their distinctive biotic and abiotic characteristics. Students are introduced to the concept of populations as a basic component of ecosystem structure and complete the unit by examining population change through the process of evolution via natural selection.
Unit 3: Photosynthesis and Cellular Respiration
The life processes of photosynthesis and cellular respiration allow for the transfer of energy and matter. Students learn how energy from the sun is transferred into ATP and reduced NADPH and eventually into glucose; they also learn how carbohydrates are oxidized to produce reduced NADH, reduced FADH, and eventually ATP.
Unit 4: Human Systems
Maintenance of metabolic equilibrium in organisms involves a number of physical and biochemical processes. The human organism is used as a model system to examine how energy and matter are exchanged with the environment through the processes of gas exchange, digestion, excretion, circulation and the function of the motor system. A defense system contributes to equilibrium by eliminating pathogenic organisms.