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Sep 21, 2021 · The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem. Photosystems exist in the membranes of thylakoids. A pigment molecule in the photosystem absorbs one photon, a quantity or “packet” of light energy, at a time.
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- Overview of Photosynthesis
The light-dependent reactions release oxygen from the...
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The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem. Photosystems exist in the membranes of thylakoids. A pigment molecule in the photosystem absorbs one photon, a quantity or “packet” of light energy, at a time.
Learning Objectives. By the end of this section, you will be able to: Explain how plants absorb energy from sunlight. Describe how the wavelength of light affects its energy and color. Describe how and where photosynthesis takes place within a plant. How can light be used to make food?
- Charles Molnar, Jane Gair
- 2015
In the light-dependent reactions, energy absorbed by sunlight is stored by two types of energy-carrier molecules: ATP and NADPH. The energy that these molecules carry is stored in a bond that holds a single atom to the molecule. For ATP, it is a phosphate atom, and for NADPH, it is a hydrogen atom.
The overall function of light-dependent reactions, the first stage of photosynthesis, is to convert solar energy into chemical energy in the form of NADPH and ATP, which are used in light-independent reactions and fuel the assembly of sugar molecules.
The higher-energy waves can penetrate tissues and damage cells and DNA, which explains why both X-rays and UV rays can be harmful to living organisms. Absorption of Light. Light energy initiates the process of photosynthesis when pigments absorb specific wavelengths of visible light.
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Highlights. Learning Objectives. By the end of this section, you will be able to: Explain how plants absorb energy from sunlight. Describe how the wavelength of light affects its energy and color. Describe how and where photosynthesis takes place within a plant. How can light be used to make food?
