IB Biology Topic C1.3.14 Thylakoids as Systems for Performing the Light-dependent Photosynthesis Reactions Revision Notes (HL)

IB Biology Topic C1.3.14 Thylakoids as Systems for Performing the Light-dependent Photosynthesis Reactions Revision Notes (HL) | RevisionDojo

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Thylakoid Structure Is Built to Run the Light-Dependent Reactions

Thylakoids are flattened, disc-shaped sacs inside the chloroplast that carry out the light-dependent reactions.
They are stacked into columns called grana, which are joined by unstacked stroma lamellae.
Each feature of this structure supports one job: turning light into ATP and reduced NADP.

Tip

Think of a granum as a stack of miniature solar panels that capture sunlight.

A Large Membrane Surface Area Holds Many Photosystems

Stacking thylakoids into grana packs a large membrane surface area into a small volume.
This membrane holds the photosystems, electron carriers, and ATP synthase needed for the light-dependent reactions.
More surface area means more pigment molecules can absorb light at the same time.

Note

Photosystem II and cytochrome b6f are concentrated in the stacked grana.
Photosystem I and ATP synthase sit mostly in the unstacked stroma lamellae, where they can reach the stroma.

A Small Enclosed Lumen Lets a Proton Gradient Build Quickly

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Thylakoid Structure Is Built to Run the Light-Dependent Reactions

Thylakoids are flattened, disc-shaped sacs inside the chloroplast that carry out the light-dependent reactions.
They are stacked into columns called grana, which are joined by unstacked stroma lamellae.
Each feature of this structure supports one job: turning light into ATP and reduced NADP.

Tip

Think of a granum as a stack of miniature solar panels that capture sunlight.

A Large Membrane Surface Area Holds Many Photosystems

Stacking thylakoids into grana packs a large membrane surface area into a small volume.
This membrane holds the photosystems, electron carriers, and ATP synthase needed for the light-dependent reactions.
More surface area means more pigment molecules can absorb light at the same time.

Note

Photosystem II and cytochrome b6f are concentrated in the stacked grana.
Photosystem I and ATP synthase sit mostly in the unstacked stroma lamellae, where they can reach the stroma.

A Small Enclosed Lumen Lets a Proton Gradient Build Quickly

Definition

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anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C1.3.14: Thylakoids as Systems for Performing the Light-dependent Photosynthesis Reactions Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Thylakoid Structure Is Built to Run the Light-Dependent Reactions

A Large Membrane Surface Area Holds Many Photosystems

A Small Enclosed Lumen Lets a Proton Gradient Build Quickly

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Thylakoid Structure Is Built to Run the Light-Dependent Reactions

A Large Membrane Surface Area Holds Many Photosystems

A Small Enclosed Lumen Lets a Proton Gradient Build Quickly

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account