Chapter 8: Photosynthesis Flashcards
Where do organisms get energy? What are autotrophs and heterotrophs?
Organisms get their energy mostly from the sun, which is used to build/contribute to photosynthesi making plants, like autotrophs. Heterotrophs eat other animals who get energy from autotrophs. The original source of energy is the sun, and runs along with ATP.
How do cells use ATP for energy?
Cells use ATP to store and release energy.
Be able to describe the process of photosynthesis in broad terms.
Photosynthesis uses energy of sunlight to convert water and carbon dioxide into high-energy sugars and oxygen. 6CO2+6H2O—–C6H12O6+6O2
How do pigments gather light energy during photosynthesis?
Pigments gather light energy with chlorophyll. Photosynthetic organisms capture the energy from sunlight, important for plants to photosynthesize. The light absorbed by chlorophyll is transferred to chlorophylls electrons and becomes high-energy electrons.
What are electron carriers? What role does NADP+ play?
Electron carriers are compounds that can accept a pair of high-energy electrons and transfer them (along with most of their energy) to another molecule. NADP+ is a carrier molecule. It accepts 2 high-energy electrons and an hydrogen ion and becomes NADH.
Understand the two main reaction pathways:the light dependant reactions and the light-indepentant reactions.
Light-dependant reactions require light, light-absorbing pigments, and water to form NADPH, ATP, and oxygen. Light-independant reactions don’t use light energy. They use carbon dioxide from the atmosphere, NADPH, and ATP to make energy-rich compounds.
Understand how and why temperature, ligh, carbon dioxide, and water effect photosynthesis.
Temperature: higher temp, enzymes get more energy for faster rate of photosynthesis and as it decreases, the rate slows down. Without light, plants wouldn’t be able to photosynthesize. CO2 is a reactant for photosynthesis. Water supplies the plant with electrons and CO2.
