The table describes five main steps that occur during the light reactions of pho
ID: 212916 • Letter: T
Question
The table describes five main steps that occur during the light reactions of photosynthesis. Description of Step Light energy is collected by pigment molecules in photosystem II and is used to energize an electron. This electron leaves the pigment molecule and ($ replaced by free electron that comes from splitting water into oxygen and hydrogen atoms Light energy energizes an electron in a pigment molecule in photosystem I. The electron is then released from the photosystem and replaced by a low-energy electron coming off of an electron transfer chain. The electron ejected from photosystem I passes through a short electron transfer chain, then combines with NADP. A hydrogen ion joins as well to form NADPH The light reactions create a higher concentration of hydrogen ions inside the inner membrane system than outside of it. These hydrogen ions flow out through special protein structures in the membrane, which powers the creation of ATP The energized electron is used to power the transfer of hydrogen ions across the membrane by passing through an electron transfer chain The table describe four basic steps that occur in the process of electron transfer phosphorylation. Step Order Description of Step An electron is brought to the electron transport chain by a carrier molecule that was created in a previous reaction. When the electron leaves the chain, it combines with an atom of oxygen and free hydrogen ions to form water The electron moves between different proteins embedded in the membrane. Some of these proteins use the energy of the electron to pump hydrogen ions from the matrix into the intermembrane space. The concentration of hydrogen ions is now higher in the intermembrane space than it is in the matrix. The hydrogen lons flow down their concentration gradient through special proteins in the membrane,powering the creation of ATP The products of the light reactions of photosynthesis are free oxygen, ATP, and carrier molecules with an atta hydrogen ion. In the following table, identify where these molecules are sent next Destination Product Expelled from the Cell Calvin-Benson Cycle ATPExplanation / Answer
ATP and NADPH produced in light reaction of photosynthesis is utilized to drive the chemical reactions necessary for synthesis of sugars and other carbon containing compounds (e.g., proteins, fats).
1.ATP is used in Calvin Benson cycle or Calvin cycle or dark reaction.
2.Oxygen is either used in reparation or is liberated out of cell in day time.
3.NADPH is used as reducing power to reduce chemicals like CO2.
Carrier molecules remains as such and are utilised in next round of light reaction.
6 CO2 are converted into one molecule of glucose. It requires the energy-released by cleavage of high energy bonds of 18 ATPs and 12 NADPHs . The resulting 18 ADPs and 12 NADP+s are then restored by the Light Phase of photosynthesis.
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