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The Anatomy of Chloroplasts

The Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A...

Anatomy of Chloroplasts

Anatomy of Chloroplasts

Green algae and plants, including green stems and unripe fruit, harbor chloroplasts—the vital organelles where photosynthesis takes place. In plants, the highest density of chloroplasts is found in the mesophyll cells of leaves.

Light as Energy

Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...

The Antenna Complex

The Antenna Complex

Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...

Photosystems

Photosystems

Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment molecules...

Photosystem II

Photosystem II

The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment molecules...

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Related Experiment Video

Updated: Jun 26, 2026

Evaluation of the Effect of Growth Factors on Chlorophylls a and b Production from Microalgae

Evaluation of the Effect of Growth Factors on Chlorophylls a and b Production from Microalgae

Published on: October 25, 2024

A viewpoint: why chlorophyll a?

Lars Olof Björn¹, George C Papageorgiou, Robert E Blankenship

¹Department of Cell and Organism Biology, Lund University, Lund, Sweden. Lars_Olof.Bjorn@cob.lu.se

Photosynthesis Research

|January 7, 2009

Summary

This summary is machine-generated.

Chlorophyll a is nearly universal in oxygenic photosynthesis due to its unique physicochemical properties and protein interactions. This vital pigment is essential for light harvesting and energy conversion in Photosystems I and II.

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Using Changes in Leaf Transmission to Investigate Chloroplast Movement in Arabidopsis thaliana

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Evaluation of the Effect of Growth Factors on Chlorophylls a and b Production from Microalgae

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Area of Science:

Biochemistry
Photosynthesis research
Plant science

Background:

Chlorophyll a (Chl a) is the primary pigment in oxygenic photosynthesis, crucial for light harvesting and energy conversion.
While Chl a is nearly ubiquitous, Chl d exists in some cyanobacteria adapted to specific light conditions (>700 nm).

Purpose of the Study:

To investigate the reasons behind the widespread use of Chl a in primary photochemistry.
To understand the unique role of Chl a in Photosystem II (water oxidation) and Photosystem I (ferredoxin reduction).

Main Methods:

Review of physicochemical properties of Chl a.
Analysis of protein environments and cofactor interactions in photosynthetic systems.
Examination of Chl a's redox properties in different photosystems.

Main Results:

Chl a's physicochemical properties make it uniquely suited for primary photochemistry.
Tailored protein environments and compatible cofactors enhance Chl a's function.
Chl a exhibits versatile redox capabilities, acting as a radical cation, radical anion, or being redox silent.

Conclusions:

Chl a is irreplaceable for global oxygenic photosynthesis due to its inherent properties and integration within photosynthetic machinery.
The unique combination of Chl a's molecular characteristics and its biological context ensures its essential role.