BIO 121 Lecture Notes - Lecture 9: Thylakoid, Accessory Pigment, Chlorophyll
Document Summary
Autotrophs: self feeders, don"t feed on other organisms. Heterotrophs: obtain organic material from other organisms. Chloroplasts are found mainly in cells of the mesophyll. Stomata: holes that let co2 enter and o2 exit the leaf. Stroma: two membranes surrounding a dense fluid. Thylakoids are connected sacs that compose a third membrane system . Thylakoids may be stacked in columns called grana. Wavelength determines the type of electromagnetic energy. Visible light (380 nm to 750 nm) includes the wavelengths that drive photosynthesis. Pigments are substances that absorb visible light at specific wavelength, the rest of the light either gets transmitted or reflected back three types of pigments in chloroplasts: Captures blue, violet and red light but reflects most green and yellow light. Absorb wavelengths (colors) of light chlorophyll a cannot and pass the energy to chlorophyll a. 6 co2 + 12 h2o + light energy c6h12o6 + 6 o2 + 6 h2o.
