BIOL 336 Lecture 9: February 2nd 2017
7 Feb 2017
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Document Summary
Holococcolith development: organic scale produced by the golgi apparatus secreted to the outside, then calcite is deposited as tiny crystals, not interlocked, but held together by organic material. Heterococcolith development: organic scales and calcite deposition in internal (golgi apparatus). They form right next to the nucleus where the golgi apparatus will contain an organic plate: calcite crystals and coccoliths interlock, coccolith functions. Protection from predation from small herbivores like protozoa. Buoyancy regulation that can foster acquisition of nutrients. Promotes efficient use of nitrogen (not really sure how/why) Protection from physical damage: calcification is highly dependent on photosynthesis (atp and nadph) Calcification: co2 + ca2+ + h2o caco3 + 2h+ 2 co2 + 2 h2o: co2 produced during calcification is used in photosynthesis (in some cases) 2 hco3- + ca2+ > caco3 + co2 + h2o: but the process of photosynthesis does not seem dependent on calcification, plastids and pigments. One or two plastids: often butterfly shape.
