BIOL 1000 Lecture Notes - Lecture 26: Thylakoid, Redox, Oxygen-18
13 May 2017
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Document Summary
Stomata = tiny pores in leaf through which co2 enters and o2 exits . Water that is absorbed by roots gets delivered to leaves in veins . Membranes in chloroplasts are where most reactions of photosynthesis take place . Stroma = thick fluid that fills the inner compartment of a chloroplast . Thylakoids = system of interconnected membranous sacs suspended in stroma . Chlorophyll molecules are build into thylakoid membranes, they capture light energy . Thylakoid membranes house machinery used to convert light energy to chemical energy . Chemical energy used in stroma to make sugar. Scientists traced the process of photosynthesis by using isotopes. Leaves of underwater plants often have bubbles of oxygen on them . C6h12o6 + 6o2 : b. van niel was experimenting with photosynthesizing bacteria that produce sugar from co2 but do not release o2 . Hypothesized that when this occurs in plants, o2 is released. Hypothesis confirmed in 1950s using 18o (heavy isotope of oxygen)
