BSC 2010C Chapter Notes - Chapter 10: Cellular Respiration, Leaf, Chlorophyll
Document Summary
Overall equation is reversal of cellular respiration. Increasingly probing studies provided knowledge about how photosynthesis works. Van helmont-developed early ideas about where plants obtain materials for growth. Ingenhousz-plants only restore air when exposed to light. Applies to any organism that makes own food without eating, decomposing or absorbing other organisms or organic molecules. Photosynthetic autotrophs include plants, algae and photosynthetic bacteria. Photosynthesis occurs in chloroplasts in all photosynthetic organisms except monerans. Leaves (specifically, mesophyll cells) are primary site of photosynthesis. Located in protein complexes in internal membranes of chloroplasts. Convert light energy to chemical energy, releases o2 as waste product. Occurs in thylakoid (individual disks) membranes and produces energy shuttles atp and nadph. Cyclic series of steps that assemble organic molecules from co2. Leaf absorbs some wavelengths (red-orange and blue-violet) and reflects others (green) In plants light absorbed by chlorophyll a, chlorophyll b and carotenoids (protect plants from sunburn) C3 plants conserve water by closing stomata.
