BIOB50H3 Lecture Notes - Lecture 5: Photosynthetic Efficiency, Vascular Bundle, Photorespiration
18 Oct 2016
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Lecture 5 september 20 it"s all a(cid:271)out e(cid:374)ergy. Without energy, organisms cannot grow, reproduce, do anything relevant to thermoregulatory, or move. All metabolic processes require energy and without it, enzymes fail, cell membranes degrade, organelles cease to operate, and life is impossible. The energy budget of an individual determines what it can and cannot do. Organisms have evolved multiple strategies for prioritizing available energy between survival, growth, reproduction, and other processes. Organisms obtain energy from sunlight, from inorganic chemical compounds, or through the consumption of organic compounds. Chemical energy stored in the bonds of food molecules. Kinetic energy associated with movement of molecules; measured as temperature. Autotrophs assimilate energy from sunlight (photosynthesis) or from inorganic compounds (chemosynthesis). The energy is converted into chemical energy stored in the carbon-carbon bonds of organic molecules. Heterotrophs obtain energy by consuming organic compounds from other organisms.
