1. Light-dependent reactions take place in the chlorophyll-containing _______ membrane. 2. ATP exists as a chain of carbon atoms with _______ groups attached to it. 3. _______ molecules present in chloroplasts are split to release oxygen atoms, electrons, and free hydrogen ions. 4. _______ is the process by which phosphate groups get cleaved off of ATP. 5. _______ use the substances in the environment around them to obtain nutrition. 6. Light-independent reactions use ATP and NADPH to convert carbon dioxide into _______. 7. Explain the basic steps in the first half of photosynthesis (light-dependent reactions). Describe the movement of electrons and the importance of hydrogen ions in developing a proton gradient that allows for ATP production.
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3) Photosynthesis is broadly comprised of two stages: the light reactions and synthesis reactions. What are the reactants and products of each stage? 4a) Are electrons themselves transferred from pigment-to-pigment in Photosystem II? Explain your answer. 4b) Once the electrons hit the special chlorophyll describe what happens in the light reactions. Use the following words: redox, electron transport chain, primary electron acceptor, water split(ting), proton gradient ATP synthase, thylakoid space, stroma, NADPH.
Adi S.
QUESTION 1 The oxygen that all oxygen-consuming organisms (like you) inhale or take in by diffusion comes from the breakdown of carbon dioxide photosynthesizing organisms the upper atmosphere oxygen containing molecules (such as NO3 and SO4) in the air that are split QUESTION 2 What absorbs light energy in plants? photons Rubisco enzymes chlorophyll QUESTION 3 The light reactions of photosynthesis occur in the ____________ and the carbon reactions (Calvin cycle) occur in the _____________. cytochromes, stroma thylakoid membranes, stroma reaction centers, vacuoles reaction centers, photosystems QUESTION 4 At the end of the light reactions, the energy rich molecules, ATP and NADPH have been produced ATP and NADPH have been used glucose has been produced the chlorophyll molecules have been consumed QUESTION 5 When light strikes chlorophyll molecules, they lose electrons, which are ultimately replaced by splitting water breaking down ATP removing them from NADPH they are not replaced
Babar A.
The light reactions of photosynthesis are divided into three steps. The following questions are about the first step in the light reactions of photosynthesis. Please be sure to number you answers to match the questions below. 1. What is the name of the first step in the light reactions? (1 pt) 2. Where is this step occurring? (1 pt) 3. Sunlight is used in this step as well as one other ingredient for photosynthesis. What is that other ingredient? (1 pt) 4. One of the products of photosynthesis is made in this step. What is that product? (1 pt) 5. The electrons in the reaction center chlorophyll are taken away by a primary electron acceptor. Where do the replacement electrons come from?
Josee P.
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