9-Photosynthesis-STUDENTVERSION-2

why is the sky blue blue light is making it to your

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: with a fixed amount of energy (no mass!) why is the sky blue? blue light is making it to your eyes white >>> everything is reflected black >>> nothing is reflected Why is the sky blue? Why does something appear white? Black? Pigment • ________ = substance that absorbs visible light – Different pigments absorb different wavelengths of light – Chlorophyll a & b appear green because they do not absorb wavelengths in that part of the spectrum – Why do leaves change colors? chlorophyll masks colors and when chlorophyll stops being produced for winter, the colorful pigments can be seen 4 1/3/2013 Overview of Photosynthesis • Light Reactions light – Convert _____ energy into chemical energy _________ • • • • H2O is split to provide e- and H+ NADP+ reduced to NADPH ATP is produced O2 is given off • Calvin Cycle (Light Independent/Dark Reactions) carbon – Fixes ______ from CO2 into organic molecules – Reduces fixed carbon into ATP sugar using the NADPHand ___ _____ from light reactions Light Reactions Light + H2O NADPH + ATP + O2 • Photosystems which capture light are located in the thylakoid membrane Light-harvesting complexes – ___________________: contain pigment molecules which absorb light and transfer the energy to reaction-center complex (i.e. antenna) Reaction-center complex – ___________________: contains a special pair of chlorophyll a molecules which can reduce the primary electron acceptor 5 1/3/2013 Harvest Light (energy) comes first even though its "II" H+ ^^^ water gets split H+ H+ H+ photophosphorylation ___________________ 6 1/3/2013 Calvin Cycle • Uses the chemical energy stored in ATP and NADPH to reduce CO2 to sugar (G3P) • Broken down into 3 phases: Carbon fixation – ___________ • Rubisco (RuBP carboxylase) attaches CO2 molecule to ribulose bisphosphate (RuBP) Reduction – ___________ • Carbon intermediate received phosphate group from ATP • Reduced by NADPH and loses the phosphate = G3P – Regeneration of CO2 acceptor __________________...
View Full Document

This note was uploaded on 01/14/2014 for the course BIO 1113 taught by Professor Rothacker during the Winter '12 term at Ohio State.

Ask a homework question - tutors are online