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The net-reaction of all light-dependent reactions in oxygenic photosynthesis is: 2H 2 O + 2NADP+ + 3ADP + 3Pi → O 2 + 2NADPH + 3ATP Key Points Light energy splits water and extracts electrons in photosystem II (PSII); then electrons are moved from PSII to cytochrome b6f to photosystem I (PSI) and reduce in energy.
- 8.2: The Light-Dependent Reactions of Photosynthesis
Like all other forms of kinetic energy, light can travel,...
- 8.2: The Light-Dependent Reactions of Photosynthesis
Like all other forms of kinetic energy, light can travel, change form, and be harnessed to do work. In the case of photosynthesis, light energy is converted into chemical energy, which photoautotrophs use to build carbohydrate molecules (Figure 8.2.1 8.2. 1). However, autotrophs only use a few specific components of sunlight.
In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. The most common and abundant pigment is chlorophyll a. A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space.
- Charles Molnar, Jane Gair
- 2015
The overall purpose of the light-dependent reactions is to convert light energy into chemical energy. This chemical energy will be used by the Calvin cycle to fuel the assembly of sugar molecules. The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem.
Course: Biology archive > Unit 11. Lesson 2: The light-dependent reactions. Conceptual overview of light dependent reactions. Light dependent reactions actors. Photosynthesis: Overview of the light-dependent reactions. Light and photosynthetic pigments. The light-dependent reactions. The light-dependent reactions.
A photon strikes the antenna pigments of photosystem II to initiate photosynthesis. The energy travels to the reaction center that contains chlorophyll a and then to the electron transport chain, which pumps hydrogen ions into the thylakoid interior. This action builds up a high concentration of hydrogen ions.
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How do light-dependent reactions begin in photosystem II?
What is the net-reaction of all light-dependent reactions in oxygenic photosynthesis?
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How do two photosystems absorb light energy?
How does light energy initiate the process of photosynthesis?
How does a photosystem II reaction work?
In the first part of photosynthesis, the light-dependent reaction, pigment molecules absorb energy from sunlight. The most common and abundant pigment is chlorophyll a. A photon strikes photosystem II to initiate photosynthesis. Energy travels through the electron transport chain, which pumps hydrogen ions into the thylakoid space.
