Complete each statement by writing the correct term in the space provided. Flat discs inside chloroplasts that are arranged in stacks are called (2) __ (3) __ are light-absorbing substances that are inside chloroplasts. They absorb light of different (4) __ The green pigment in plants that is essential for photosynthesis is (5) __ Light energy absorbed by this pigment excites (6) They are transferred to a(n) __ __ Read each question, and write your answer in the space provided. 8. Summarize the three steps in the electron transport chain that produces ATP __ 9. Summarize the two steps in the electron transport chain producing NADPH. __ instructor

## Step 1<br />The first statement is about the flat discs inside chloroplasts that are arranged in stacks. These are known as thylakoids. Thylakoids are the site of the light-dependent reactions of photosynthesis.<br /><br />## Step 2<br />The second statement is about light-absorbing substances that are inside chloroplasts. These are called pigments. Pigments such as chlorophyll and carotenoids absorb light of different wavelengths.<br /><br />## Step 3<br />The third statement is about the green pigment in plants that is essential for photosynthesis. This pigment is called chlorophyll. Chlorophyll absorbs light energy and converts it into chemical energy during photosynthesis.<br /><br />## Step 4<br />The fourth statement is about the process that occurs when light energy is absorbed by chlorophyll. When light energy is absorbed by chlorophyll, it excites electrons. These excited electrons are then transferred to a different molecule.<br /><br />## Step 5<br />The fifth statement is about the process that occurs when electrons are transferred to a different molecule. This molecule is called NADP+. When electrons are transferred to NADP+, it becomes NADPH.<br /><br />## Step 6<br />The sixth statement is about the process that occurs when electrons are transferred to NADP+. This process is called reduction. When electrons are transferred to NADP+, it becomes NADPH.<br /><br />## Step 7<br />The seventh statement is about the process that occurs when electrons are transferred to NADP+. This process is called reduction. When electrons are transferred to NADP+, it becomes NADPH.<br /><br />## Step 8<br />The eighth statement is about the three steps in the electron transport chain that produce ATP. The first step is the transfer of electrons from NADH and FADH2 to the electron transport chain. The second step is the pumping of protons across the mitochondrial membrane, creating a proton gradient. The third step is the synthesis of ATP from ADP and inorganic phosphate, driven by the flow of protons back across the mitochondrial membrane.<br /><br />## Step 9<br />The ninth statement is about the two steps in the electron transport chain that produce NADPH. The first step is the transfer of electrons from NADH to the electron transport chain. The second step is the reduction of NADP+ to NADPH.