Biology 1002B Chapter Notes - Chapter 1: Chloroplast, Flagellum, Radiography
27 Jan 2016
School
Department
Course
Professor
Document Summary
Light serves two important functions for life on earth: a source of energy that directly/indirectly sustains virtually all, provides organisms with information about the physical world organisms that surrounds them. Chlamydomonas reinhardtii: single-celled photosynthetic eukaryote, commonly found in ponds/lakes: uses light for both energy/information, each contains single large chloroplast; harvests light energy. Uses light energy to make energy-rich molecules through photosynthesis: eyespot: light sensor, each cell contains that allows individual cells to gather information about location/intensity of a light source. Using this information, cells can move away or toward light source; optimizing light harvesting for photosynthesis. Positively or negatively phototactic (toward or away from light) Earth is perfect distance from sun for life: as far as we know, no where else in solar system has this. Sun coverts hydrogen into helium at high rate. Sun converts 4 million tonnes of matter into energy every second: energy is given off as electromagnetic radiation.
