1 What molecule is the source of the electrons in the electr

1 What molecule is the source of the electrons in the electron transport chain? 2 What molecule is the source of the oxygen that is released as a byproduct of photosynthesis? 3 What molecule is the source of the protons that are used to establish the proton gradient? 4 What molecule does the electron end up in at the end of the two light dependent reactions (i.e. After Photosystems II and I)? 5 What is the proton gradient used for? 6 What does the term ‘carbon fixation’ refer to? 7 According to the video, the output of the Calvin Cycle is a 3-carbon molecule called G3P, which the cell can use to make glucose (or other organic molecules). How many ‘turns’ of the Calvin Cycle would be necessary to produce one molecule of glucose?

Solution

1. NADH and FADH2 are the source of electrons in electron transport chain.   electrons from NADH and FADH2pass through the electron transport chain to oxygen, which is reduced to water.

2. Water is the source of oxygen in photosynthesis. Oxygen is released by the photolysis of water.