Question

1. Why are two photosystems needed when H2O is used as an electron donor?

2. How do antenna chlorophylls differ from reaction center chlorophylls?

3. What are the ways that organisms obtain energy and carbon from the environment? What are the names used to describe these organisms?

Answer 1

© The two photosystems aboosb light eneagy through pooteens containing pigments such as chlorophyll. The Üght dependent reaction begen in photo- System I because the electrons bave lost energy poor to their coolual at PSI, they must be reenergized by psi Therefore another photon is aboobed by psi antennae. The panooy fenchon of the photosystem liso NADPH synthesis cubere 't deceives the electrons froom Ps 11. The parmaoy fontos of the photosystem II is in the bydloolysis of water and ATP synthesis - The RSI ? made up of 2 subunits webuch are. Asa A and PsaB. photosystem II 18 ai specialized portes complex that uses light eneəqy to dove the transfer of electrons from water to plastoquenene resulting in the produchots of oxygen and release of seduced plastoqunine into photosynthetic member

2.) The number of core antenna pigmond is voniable between different types of reachon centers. In oupenic organisms d the psll wore, antenna consists of w40 chlosophylls cubere as PSI Love antenna consists of v 100 Chlorophyls 3) Eneogy casbon and electoons.Osganisme di acquire eneggy by two genesal methody'. . Dught 2) chemical oxidation ... poroductive organism called autoloops Conveat light or Chemicals into eneagu zich osganic compounds begining with energy poor carbon dioxide Heterotooph are än Oopinism that can not produce its own food instead taking netalwon from other source of Ooganu compound

auto boopb is an ozganism that produce Complex organic compounds forom simple sabstances present in its surrounding genezally using energy foom ught or enorganic chemical reachop Cchemosynthesis I. OS