Name: how chloroplasts power photosynthesis
Uploaded: 2025-05-22T09:05:32.000Z
Duration: 1 min 8 s
Channel: JoVE

K12 Standards

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NC K-12 Science Standard Course of Study

9-12

Biology

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms- Structures and Processes

LS.Bio.3.2

The Anatomy of Chloroplasts

In plants, photosynthesis primarily takes place within the leaf&#39;s dense mesophyll cell layers because they contain the highest number of chloroplasts.
Chloroplasts are specialized double membrane organelles that enclose an aqueous cavity called the stroma.
Inside the stroma, lie membranous sacs called the thylakoids that are layered on top of each other to form multiple stacks called the grana.
The grana are interconnected with single thylakoids called the stroma thylakoids.
Embedded within the thylakoid membranes are multiprotein complexes such as the photosystems.
Photosystems contain the antenna proteins bound to numerous pigment molecules, like chlorophylls, which help them absorb light and initiate the first stage of light-dependent reactions.
Meanwhile, the second stage, the Calvin cycle, takes place in the stroma.
With both processes working together, plants are able to produce their own food, thanks to the biochemical factories found in the chloroplast.

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 &#8212; 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&#160;and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A chloroplast is surrounded by a double membrane. The outer membrane faces the cytoplasm of the plant cell on one side and the intermembrane space of the chloroplast on the other. The inner membrane separates the narrow intermembrane space from the aqueous interior of the chloroplast called the stroma.
Within the stroma reside another set of membrane-bound disk-shaped compartments known as thylakoids. The interior of a thylakoid is called the thylakoid lumen. In most plant species, the thylakoids are interconnected and form stacks called grana. Embedded in the thylakoid membranes are multi-protein light-harvesting complexes that consist of proteins and pigments, such as chlorophyll.&#160;
Evolution of Chloroplasts
According to the endosymbiosis theory, chloroplasts evolved when an endosymbiont cyanobacterium was engulfed by a primitive eukaryotic cell. During the course of evolution, they slowly acquired new attributes within the eukaryotic cells while retaining some characteristics of their ancestral prokaryotes. For example, chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures similar to prokaryotic cells. In addition, chloroplasts undergo binary fission and equally separate their DNA into the daughter organelles, as observed in prokaryotes.

Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They ...

Education

JoVE Core

Cell Biology

Unit 1

Chloroplasts and Photosynthesis

KEY TERMS AND CONCEPTS

how chloroplasts power photosynthesis

Chloroplasts are the organelles that power photosynthesis in green algae and plants. They are found in green stems and unripe fruit as well as in leaves. Inside chloroplasts, the two stages of photosynthesis work together to turn sunlight, carbon dioxide, and water into chemical energy.

The light-dependent reactions capture sunlight and release oxygen. They also make ATP and NADPH, which are energy-rich molecules. The light-independent reactions then use ATP and NADPH to capture CO2 and build sugar.

A chloroplast has a double membrane. The outer membrane faces the plant cell cytoplasm, and the inner membrane surrounds the stroma, which is the watery interior of the chloroplast. Inside the stroma are thylakoids, which are disk-shaped membrane compartments. The inside of each thylakoid is the thylakoid lumen. In many plants, thylakoids connect into stacks called grana.

The thylakoid membranes contain light-harvesting complexes made of proteins and pigments such as chlorophyll. These complexes help absorb light for photosynthesis. Chloroplasts also have an evolutionary link to cyanobacteria. According to the endosymbiosis theory, a primitive eukaryotic cell engulfed a cyanobacterium that later became a chloroplast. Chloroplast genomes still show some prokaryote-like traits. They do not bind with histone-like proteins or form complex chromosome-like packages. They also divide by binary fission and split their DNA equally into daughter organelles.

How Chloroplasts Power Photosynthesis

what is photosynthesis?

Photosynthesis Powers the Food Chain

Photosynthesis powers the food chain by turning sunlight into usable chemical energy. It is the only biological process that can capture energy from sunlight and convert it into chemical energy that organisms use to support metabolism. Photosynthesis also provides the oxygen needed by many living things. Organisms are often grouped by how they get food. Autotrophs are organisms that make their own food. Plants, algae, and cyanobacteria are autotrophs, and because they use light to make...

Chloroplasts are the organelles that power photosynthesis in green algae and plants. They are found in green stems and unripe fruit as well as in leaves. Inside chloroplasts, the two stages of photosynthesis work together to turn sunlight, carbon dioxide, and water into chemical energy. The light-dependent reactions capture sunlight and release oxygen. They also make ATP and NADPH, which are energy-rich molecules. The light-independent reactions then use ATP and NADPH to capture CO2 and build...

the calvin benson cycle

Photorespiration, C4, and CAM Pathways

Photorespiration and the C4 and CAM pathways change how plants handle carbon dioxide during photosynthesis. These processes matter because RuBisCo, the enzyme that starts carbon dioxide fixation, works very slowly. A typical enzyme can process about a thousand molecules per second, but RuBisCo fixes only around three carbon dioxides per second. To make up for this slow rate, photosynthetic cells produce very large amounts of RuBisCo. That is why it is the most abundant single enzyme on Earth. <br...

the photochemical reaction center

Light-Harvesting Antennas in Reaction Centers

Light-harvesting antennas and reaction centers work together in photosynthesis. A reaction center is a pigment-protein complex that starts the conversion of light energy into chemical energy. The term photochemical reaction center is more precise because these complexes carry out the first light-driven chemical step. Robert Emerson and William Arnold gave the first experimental evidence for these centers. They showed that nearly 2,500 chlorophyll molecules were involved in the release of just...

the antenna complex

Light-Harvesting in Photosynthesis

Light-harvesting in photosynthesis depends on the antenna complex, also called the light-harvesting complex (LHC). Plants and other photosynthetic organisms use this system to collect direct sunlight with pigments in both the reaction center and the antenna complex. The reaction center is the main site of photochemical reactions. Under average light conditions, the reaction center pigments absorb light more slowly than the electron transport chain can use it. The reaction center alone cannot...

photosystems

Photosystems in Light Reactions

Photosystems are pigment-rich protein complexes that help drive the light reactions of photosynthesis in plants, algae, and cyanobacteria. They are embedded in the thylakoid membrane inside the chloroplast. Their job is to capture light energy and pass it along for chemical use. Each photosystem contains many pigment molecules, including chlorophylls and carotenoids. These pigments are arranged in two parts: the antenna complex and the reaction center. The antenna complex absorbs photons and...

the z-scheme of electron transport in photosynthesis

the-z-scheme-of-electron-transport-in-photosynthesis

How Electron Flow Powers the Z-Scheme

The Z-scheme explains how electrons move through the light reactions of photosynthesis. In this process, light energy drives electrons from water to NADP+, and oxygen is released when water splits. Because water is hard to oxidize, the reaction needs a strong oxidizing agent. That role is filled by oxidized P680, also called P680+. It is the first product of the light reactions and is known as the most powerful oxidizing agent in biology. After it gains an electron from water-splitting, P680+...

key terms and concepts

Learn how chloroplasts capture light, make ATP and NADPH, and use their membrane structures to support photosynthesis in plants and green algae.

How Chloroplasts Power Photosynthesis | JoVE K12

cell biology

JoVE Core Cell Biology illustrates complex cellular processes in easy-to-understand yet comprehensive animated video lessons. This collection focuses on the essential components and functions of cells, including organelles and membranes, cellular transport, and cell energetics. It is complemented by scientist-in-action videos that demonstrate the application of cell biology in real-world research experiments.

Pennsylvania State Academic Standards

Life Science

matter-and-energy-in-organisms-and-ecosystems

Matter and Energy in Organisms and Ecosystems

3.1.9-12.E

3.1.9-12.J

3.1.9-12.K

Louisiana Student Standards for Science

High School

Life Sciences

From Molecules To Organisms: Structures And Processes

HS-LS1-5

ecosystems-interactions-energy-and-dynamics

Ecosystems: Interactions, Energy And Dynamics

HS-LS2-1

Environmental Science

HS-LS2-4

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Ohio’s Learning Standards and Model Curriculum

Cells

Cellular processes

Tennessee Academic Standards

From Molecules to Organisms: Structures and Processes

BIO1.LS1.8

Virginia  Standards of Learning

HIgh School

BIO.2

BIO.2.e

Minnesota Academic Standards in Science

3.1.1 9L.3.1.1.2

3.2.1 9L.3.2.1.3

new-jersey-student-learning-standards-for-science

New Jersey Student Learning Standards for Science

Arizona Science Standards

HS+B.L1

HS+B.L1U1.4

HS.L2

HS.L2U1.21

HS+B.L2

HS+B.L2U1.8

Alabama Course of Study Science

9-12.B.1.5.b

Florida Department of Education

SC.912.L.14

SC.912.L.14.5

SC.912.L.18

SC.912.L.18.7

south-carolina-college-and-career-ready-science-standards

South Carolina College and Career Ready Science Standards

B-LS1-5

Georgia Standards of Excellence

Botany

SBO1.

Photosynthesis

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How Chloroplasts Power Photosynthesis

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